08/25/2010 13:53

– One thermostat centrally located in a– A zoning system delivers increased energy– A zoning system allows you to set theotal CFM - Smallest Zone CFM = By-Pass CFMWhen by-passing air into the return air duct it isand Downsizing

What is Zoning and Zone Control?


Zoning and Zone Control of Heating, Ventilating and Air

Conditioning (HVAC) Systems are two ways of saying individual

temperature control from one central HVAC System. Typically with

almost all forced air systems there is only one thermostat to control

the heating and cooling. Once that thermostat calls there is

virtually no way to control the temperature in each room of the

house except manually closing off the outlets in each room.

This manual method is time consuming and can cause harm to the

HVAC Unit as closing off too many outlets can reduce the airflow in

the HVAC severely shortening the life of the furnace, air conditioner

or heat pump.

True zoning is a professionally installed zone control system

consisting of a damper and thermostat for each room or zone of the

house and wired into a central control panel that sequences each

thermostat’s call with the zone dampers in the ducts and the HVAC

Unit. In some instances a by-pass damper or duct maybe required

to relieve excess air when smaller zone(s) are the only ones calling.

Zoning can simply be related to having a light switch in every room

of the house. You wouldn’t install just one light switch to turn on

and off all of the lights in the house….Would you? The same is true

for heating and cooling. One thermostat turning on the heating or

cooling for the entire house, when you only need a little in one

room or zone is extremely wasteful. Also, why heat or cool rooms

that may already be comfortable and air is needed in other portions

of the house.




If you are only living in or occupying one room or zone of your

house, why heat or cool the entire house? Why you need Zoning is

for the many benefits zoning provides.



hallway, dining room or even the living room cannot properly

control the temperature in any other area than the area nearest the

thermostat. If you have a multi-level home it is very hard to control

the temperature on the second floor when the thermostat is on the

first floor.

There are many factors that affect the indoor temperature in your

home. Outdoor conditions such as solar gain, wind chill, shading;

building design such as large glass areas, cathedral ceilings, multilevels,

below grade rooms, sprawling ranch designs; and internal

factors such as fireplaces, heat from lights, cooking, appliances, etc.,

all affect the temperature throughout the home.

Take for example the kitchen, the most widely variable temperature

room in the house. In winter with cooking not much heating is

needed, however in the summertime a lot of cooling is needed.

Also rooms with fireplaces, and if there thermostat is located here,

while a fire is burning the rest of the home can be very cold.

Zoning solves these problems by allowing de-centralized control and

allowing each zones thermostat to make the demand instead of

what’s good for one has to be good for everyone.

Zoning improves the overall comfort by allowing the zone

thermostats to react to changes in temperature in each zone. This

prevents over heating or cooling some rooms while others rooms

are under heaed or cooled. Zoning provides perfect comfort, where

and when you want.



efficiency on any HVAC System. Zoning allows you to set back

thermostats in zones not being used and prevents zones from be

over heated or cooled while other zones are not yet comfortable.

Look at the illustration below showing one thermostat and a typical

multi-level home. Each zone has an equal share of the energy bill.

However now add zoning and think of how often that zone is being

used and how much energy can be saved by turning off the heating

and cooling to those zone when they are not being used. Or how

much energy you’re wasting because they are too hot or cold while

others are yet to be comfortable. See below the possible savings.

Zoning savings have been achieved by many users of zoning

systems. Actual results by homeowners have reported as much as

20% to 30% savings. These results in tests can be greater when

combined with automatic setback thermostats achieving multiple

setbacks per day.

Savings of zoning systems over single zone thermostat systems are

well documented and even show a reduction in the number of

cycles of the furnace and air conditioner. Reducing the cycles of

any piece of equipment can extend its service life.

Zoning is not a new concept. Other forms of zoning have been

used with hydronic heating systems for over 50 years, using zone

valves or circulating pumps as their form of damper. In large

commercial HVAC systems VAV (Variable Air Volume) systems are a

more sophisticated form of zoning. Both hydronic and VAV zoning

have proven similar 20% to 30% savings over single zone systems.



temperature in the room or zone you’re in and not have to go to

another area of the home to change the temperature. If you’re in

the bedroom at night ready to go to bed, you can adjust the

temperature you want right there without having to go to the living

room or some other area. You can then rest assured that you are

only conditioning your bedroom zone and not all other areas of the

home. You also don’t have to guess at what temperature it has to

be in the living room in order for you to be comfortable in the

bedroom or go around closing off outlets to make sure more air gets

pumped into the bedroom.




Zoning is a simple product and concept. As you have no doubt

realized by now that zoning provides the ability to only condition

those rooms that need heating or cooling and does not allow

conditioned air into those zones not requiring it.

Zoning does this through a series of components. The first being

motorized dampers that open and close based on the demands of

the zone thermostats. These dampers insert into the ducts or can be

installed at the air outlet for each room or zone. Multiple dampers

can be controlled together for a single zone if multiple ducts serve a

single room or zone. manufactures a series of damper controls to

control every type of duct and outlet.

The next key components are the zone thermostats. The

ZONEFIRST™ Systems use any standard heating and cooling

thermostat. In existing homes the existing thermostat can used as a

zone thermostat. ZONEFIRST Zoning Systems are compatible with

all standard 4 wire and heat pump thermostats. As each zone is

divided, each zone uses a thermostat to control the heating, cooling

and fan operation for its individual zone.

The zone thermostats and dampers are wired into a central control

panel. This panel requires a separate 24 Volt transformer to power

the panel, dampers and thermostats. The panel then also connects

to the thermostat connections on the HVAC Unit. Instead of using

one central thermostat, the MasterZone control panel allows the

unit to be controlled by multiple thermostats.

As each thermostat calls, be it for heating or cooling, the panel takes

the first call from any zone. If it is heating it will keep open the

damper to the calling zone, close the dampers to satisfied zones not

calling for heating, activates the furnace or heat pump and begin

supplying air only to that zone. If during this call other zones cal for

heating those zone dampers would open and heated air would be

supplied to those zones as well. Once all heating calls are satisfied

the panel will shut off the furnace or heat pump. The panel will

enter a purge mode to direct the excess heated air to the last

zone(s) calling. Once this purge mode is over the panel will see

what other calls exist. During that time other heating or cooling calls

can be made and the panel with then enter the next calls, operate

the appropriate equipment and cycle the dampers open to only

those zones calling and close the dampers to the zones that are


In some instances a separate by-pass damper is installed to relieve

any excess air from zones that are open and maybe too small to

handle the full capacity of the blower. This air is typically by-pass

into the return air duct or into a common area such as a hallway.

When air is by-passed into the return air duct capacity controls for

both the heating and cooling are also used to prevent overheating

or overcooling in the unit.




When zoning any system one must look at a practical cost effective

number of zones for the home or office building. Most homes are

typically two to four zones. Offices can almost be any number of

zones depending upon the size of the building.

Most commonly a home is at least 2 zones, those being the living

room, kitchen on one zone and the bedrooms, bathrooms on the

second zone. Many other ways of zoning are by levels here each

floor is a zone, or by occupancy and use or by exposures. Here’s a

typical 2 zone single level home zoning bedrooms and living areas.


ZONE 1 – LR/K/DR ZONE 2 - Bedrooms





As the home gets larger the need for zoning increases and typically

many newer homes may have a zone for the formal living room and

dining room, a second for the back kitchen and family room, and a

third for the upstairs bedrooms. Possible others would be to split

the master and guest bedroom and the kid’s bedrooms. Another

maybe even still be the basement recreation room. The possibilities

are many and it all comes down to the comfort level and

convenience one want to achieve, keeping in mind the cost

associated with adding each zone. Below is the same home

however showing a zone for each bedroom.


ZONE 1 – LR/K/DR Each Bedroom






Any homeowner looking for a new home or looking to upgrade the

existing HVAC should at minimum consider at least two zones

between the living zone and bedroom zones.

Zoning any system requires a little thought and sometimes

imagination and creativity. Every new home has the ability to be

zoned, since zoning can be designed into the construction. Existing

homes adding zoning can take some creativity and imagination in

order to adjust to the existing ductwork. Depending upon the duct

layout in-line dampers may not be able to be used and motorized

registers or diffusers can be used to control the outlets. However

one must always consider the cost of going with several motorized

registers or diffusers versus the possibility of modifying the ductwork

in order to use one in-line damper. Wring is the other obstacle,

especially in retrofit systems. However with the coming of wireless

thermostats this makes installing zoning that much easier.

Here are some different duct layouts for different types of


Above is shown a simple two zone system that can be split

upstairs/downstairs or living area/bedroom area. The round take-off

duct would be the by-pass ducted back to the return or a dump

zone to a non-critical area.

On the right is a two

zone system with

multiple take-offs on

each zone. This

illustrates using a zone

damper to control

more than one outlet

vs. using multiple


Below illustrates a two zone system where the take-off ducts run in

several directions and the zone dampers feed from the bottom of

the separate zone ducts.

Below is shown a three zone bi-level type home where each living

area is a zone. The main level is split between the Living Room and

Kitchen Zone and the Bedroom Zone over the garage. The lower

level Family Room is a thrd zone.

Above is the same split-level home however with each bedroom as

an individual zone as well as the kitchen. The kitchen is one of the

most highly variable temperature rooms in the home requiring not

much heating in the winter but a lot of cooling during the summer.

Below is a typical radial duct system that may be a single level ranch

type home or an overhead system with five zones using small

extended plenums each with a zone damper to control multiple



Living Room

Family Room
















Zoning any forced air system is easy once you know a few of the

basic rules. The main consideration is to maintain a constant

amount of air flow (CFM) through the HVAC Unit. This needs to

occur when only one zone is open and if the zones are of varying

size, when the smallest zone is open. The other consideration is

not to oversize a duct system too much in order to maintain

adequate velocity and airflow when all zones are open and may be

calling for conditioning on those design temperature days.

The design of the duct system for today’s zoning is an important

factor to a comfortable and efficient zoning system. The number

of zones, along with their size, often determine the best type of


There are scenarios for zoning. The first, which is typically on new

installations of where the duct work can be designed for zoning

would be to oversize the ducts for each zone in order to get more

air to the zone when it may be the only one calling. The scenario

for all others would be to use a by-pass damper to relieve the excess

air pressure in the duct system when a minority number of zones are


In new installations where ducts are being added it is recommended

to size each zone duct the same and to size the duct for

approximately 2/3 of the total HVAC System CFM. This is practical

on systems with 2 or 3 zones and when all zones are approximately

equal in size. This is NOT practical in an installation where 80% of

conditioned area is one zone and 20% is the other zone.



















The reason for each zone duct being the same size is that any zone

could be the only zone calling and therefore that zone must handle

the CFM of the HVAC Unit. When the duct is sized for 2/3 of the

total CFM the smaller size does restrict the airflow and forces the air

at a higher pressure and velocity, however it does not increase the

air typically over that static pressure rating of the blower motor,

usually 0.5”W.C. This also keeps the air velocity from being

noticeably noisy. Below is a quick guide to determine the minimum

equivalent size of a zone duct for each size HVAC Unit.


System CFM Zone Duct Branch Ducts

800 CFM 12”x8”/12”Ø 5-6” Rounds

1,000 CFM 14”x8”/12”Ø 5-6” Rounds

1,200 CFM 16”x8”/14”Ø 6-6” Rounds

1,400 CFM 18”x8”/14”Ø 5-7” Rounds

1,600 CFM 20”x8”/16”Ø 5-7” Rounds

2,000 CFM 22”x8”/18”Ø 5-8” Rounds


Systems over 5 Tons typically are commercial and would use a bypass

damper to relieve the excess air pressure when the majority of

zones shut down.

In retrofit and systems with 4 zones or more, over sizing the ducts is

not practical. In these instances a by-pass damper is used to relieve

the excess air back into the return air duct or dump the air into a

central area of the building, such as a hallway, where often there is a

common return. In this instance try to locate the by-pass air as far

away from the return air intake as possible.

The key to a good zoning system is to deliver the conditioned air to

the calling zone as fast and quietly as possible in order to satisfy the

demand. Whatever air cannot be directed into the zone must then

by by-passed. This develops the formula for calculating the size of

the by-pass damper.



Once the amount of by-pass air is known it is just common sense to

size a duct adequately to handle the amount of air. ZONEFIRST

has both round and rectangular/square by-pass damper sizes.



imperative that capacity controls such as the AFC or Leaving Air ™

Sensor be used in order to protect the HVAC equipment from

freezing, overheating or pressure limits on the compressor.

The diagram above shows a typical three zone damper system with

a barometric by-pass, Model SPRD, between the supply air and

return air duct. A round take-off is also shown as an uncontrolled

dump zone delivering air continuously to a non-critical temperature

area, such as a basement or hallway as another method of relieving

excess air. Either a by-pass or a dump zone is used but rarely ever

is there a need for both.


Another form of by-pass is using minimum position dampers, such as

the ZD and RDS dampers. Setting the larger zone dampers to a

minimum position can also be a method of relieving excess air

pressure. This should be used when only small amounts of air need

to be by-passed as the minimum position air in some cases can

cause a zone to overshoot its comfort zone. Caution must be

exercised when using minimum position dampers for by-pass.




Heat Pumps are a very popular form of heating and cooling in the

milder climates of the country. These efficient units use the

compressor for both heating and cooling and have a reversing valve

that reverse the flow of refrigerant in order to switch between

heating and cooling modes.

Heat pumps, while very efficient, are also most efficient in milder

climates where often there is more of a cooling demand than a

heating demand, such as the southern United States. A heat pump

is also rated based upon its cooling capacity and not the heating

capacity and rely typically on electric resistance heating to

supplement the heat pump in colder weather, often less than 35°F to

40°F. When this back-up form of heat is used to supplement the

heat pump compressor, the cost to heat the home rises dramatically.

It is this reason that zoning should be installed with every heat

pump. ZONEFIRST has been zoning heat pumps for over 25 years

and making homes with zoning and heat pumps the most efficient

and affordable homes on the block.

Heat pumps with their limited capacity for heating cannot afford to

be run on the colder climates heating the entire home or building.

However if the heat pump is zoned, most likely less than the total

building requires heat at any one time. The zone calling typically

requires less than the total BTU capacity of the heat pump, more

evenly matching the heat pumps capacity to the load of the calling

zone. By doing so this lessens the need for the supplemental heat to

come on, therefore providing substantial energy savings.

For example, a typical home may have a 3 Ton (36,000 BTU) heat

pump. The total heating load for the home at heating design

temperature maybe 60,000 BTUs or even more. Obviously with

only 36,000 BTUs the heat pump can never keep up at design

temperatures. However during milder temperature days, those

above 45°F, the heat pump will often be more than adequate.

Heat pumps most efficient outdoor temperature, typically 45°F to

50°F and the amount of BTUs produced by the heat pump

decreases as the temperature moves further below this temperature.

This is when the supplemental electric resistance heat is often

needed. As the heat pump compressor heats the air, the electric

resistance heaters, located downstream of the heat pump coil, can

come on to supplement the heat pump air. However if the system is

zoned and heating is required for typically only one room or zone,

the capacity of the heat maybe equal to or greater than the heating

load of that zone and even as the output of the heat pump

diminishes as the outdoor temperature falls, the capacity of the heat

pump, (BTU output) is adequate for the zone(s) calling therefore not

requiring the use of the supplemental heating.

The combined use of zoning and heat pumps allows more equally

matched capacity to match the load of those zones calling allowing

the most efficient form of heating to be used. Even during the

colder times when the supplemental electric heat is needed, it is

important to remember that a smaller amount of heating is always

required for one room or zone vs. the whole house. Zoning allows

the heating to be directed only to those areas needing it.


Fossil Fuel Furnaces and Add-On Heat Pumps


When a heat pump is added on to a fossil fuel (gas or oil) furnace,

the sequence of operation is somewhat different that using electric

resistance heating as supplemental heating. The heat pump coil is

often on the supply side of the furnace and both the heat pump and

furnace cannot be run together as the high temperature from the

furnace will damage the heat pump compressor.

All heat pump manufacturers use a fossil fuel kit in order to make

the most effective use of the heat pump and furnace. Simply this

fossil fuel kit uses an outdoor thermostat to switch between the heat

pump and furnace based upon the outdoor temperature or balance

point. The balance point is calculated to determine the most

effective temperature to operate the heat pump vs. the furnace. See

the heat pump manufacturer’s information to calculate the balance


When using a ZONEFIRST System with an add-on heat pump it is

recommended to use the manufacturer’s fossil fuel kit in order

maintain the manufacturer’s warranty. The zone control panel

equipment terminal block will be wired to the thermostat

connections on the fossil fuel kit.

When using any heat pump it is important to remember that with a

limited amount of heating capacity, ZONING is imperative in order

to make maximum use of the heat pump and where the individual

zone load is more closely matched to the capacity of the heat pump.




Zoning is a must with the new higher efficency and variable speed

equipment. The only change for varable speed equipemt is to use a

Static Pressure Switch, Model SPS, and a motorized modulating

damper, either the ZDM (square/rectangular) or RDM (round)

damper. This will cost a little more than a barometric by-pass,

however can save time setting up the zoning system.

When only a small number of zones calls the variable speed unit will

ramp up seeing the pressure restriction in the zone dampers. The

motorized by-pass damper and static pressure switch will see this

rise in static and quickly open the by-pass damper to respond to the

increased air movement. As the by-pass opens the variable speed

fan will slow seeing the reduced static and keep the air volume and

noise from being to drafty or noisy.




Zoning for commercial and light commercial office buildings makes

even more sense as every person has their own idea of their own

comfort level. The number and 2 complaints in any office is its

either TOO HOT or its TOO COLD. Being able to provide each

office with its own thermostat to control the temperature is a simple

and cost effective way to solve this problem.

Here is a small professional office with 4 zones. One zone would

be the waiting room, reception area, another be the receptionist’s

office, another be the boss’s/doctor’s office, or conference room

and the other smaller rooms be offices or examining rooms all on

the same zone.

In commercial buildings they need for zoning is every increased by

the building exposure when offices facing south and north are

controlled by the same thermostats. Those south facing offices on a

bright sunny day may be needing cooling while offices on the

northern side with no solar gain still need heating. In the morning

the entire building may need heating for a morning warm up and

soon after only the perimeter offices need heating while the interior

core needs cooling. Conference rooms that go for hours unused

can be shut off and then when there is a meeting and the offices are

not being used, the conference room can be controlled comfortably

by having its own thermostat.

ZONEFIRST Zoning Systems can automatically direct the flow of the

conditioned air to those zones needing it and automatically switch

over and provide the opposite mode to the other zones eliminating

the need for on site techs to constant balance and adjust outlets

based upon the ever changing conditions.

Light Commercial and Commercial systems are basically just bigger

residential systems with more capacity. Duct design for these will

almost always include a by-pass system, especially those over two to

three zones. The commercial systems are easier to retrofit as the

false ceiling space if often used as a common return and a great

place to by-pass the air. Wiring is a snap as well as damper

installation all taking place in the false ceiling.

Zoning also helps the landlord in tenant improvement costs by

eliminating the need to ad separate air conditioning units in order to

satisfy multiple tenants on one HVAC system. While one tenant in a

professional suite maybe an attorney and have more normal working

hours, the doctor and dentist with after hours patients on evenings

and Saturdays can still get conditioning by having there own

temperature control.

Commercially, zoning is a very economical alternative to the more

sophisticated VAV and computer controlled HVAC systems. Zone

Control in commercial buildings can range from installing a single

motorized damper and thermostat to control an over-conditioned or

seldom used room or office; such as a conference/training room to

zoning every room on the HVAC System.

There is really little difference in zoning a residential 5 Ton Split

HVAC System and a commercial 5, 7-1/2, 10, 15 or 20 Ton Package

Rooftop HVAC Unit. The system components of the dampers,

thermostats and control panel can be the same in many instances.

The only difference is the commercial rooftop maybe 2 stage

heating and/or cooling and there may be more zones and the duct

sizes may be larger, however the basic operation remains the same.

The Number 1 and 2 complaints in office buildings are people are

either Too HOT…..or Too COLD. Zoning is the less expensive

alternative to the more commercially used VAV Systems and

provides just as good temperature control as those expensive system

for a fraction of the cost.

The design of a commercial zoning is also the same as a residential

system where a by-pass is most typically used. Small commercial

systems that may be just two zones might be able to get away

without a by-pass provided they are only two zones and the ducts

for each zone are larges enough to handle 60% to 70% of the total


Commercial zoning systems of three zones or more will need a bypass.

The by-pass for commercial is often easier as many times the

false ceiling space is used as a common return. Here again it is

always important for the by-pass damper to be located as far away

from the blower as possible. Barometric by-pass dampers can be

used up to 7.5 Tons (3,000CFM). Over 10 Tons (4,000 CFM) should

use a motorized by-pass and a static pressure control.




For years many HVAC Installers and Home Builders have used

multiple HVAC units in order to accomplish zoning. Installing a unit

for the upstairs and another for the downstairs is typically most

common. While affective to achieve zoning, using multiple units is

often an unnecessary and substantially higher added cost.

There are good reasons for using multiple units. They would be that

the load of the home is so big that multiple units are needed.

Homes continue to grow in size and on average homes over 3,000

square feet will typically require more than 5 Tons of cooling. In

these larger homes, multiple units are necessary. Typically trying to

use one central unit also creates long duct runs that may not

properly get the airflow to all areas. Using multiple smaller units can

be more effective however in these instances a zoning system

should still be looked at as each smaller unit could still be subdivided

into small zones.

The case for multiple units is also used in existing homes where addon

air conditioning may be installed and duct work cannot be run

throughout the house. Example a older home without ductwork,

that may utilize steam or hot water heating and air conditioning is

being added. In order to add central air conditioning for both levels

ductwork cannot be run from the basement to the second floor or

from the attic down to the first floor.

However when two units are installed side by side in the same area

and both units add up to less than 6 Tons, this is the case for using

one unit and zoning.

Anytime a contractor can install one unit versus two, or more, the

homeowner wins. Maintenance costs are cut with every unit saved.

Remember the maintenance of air filters, electronic air cleaners,

humidifiers, electrical requirements and the life expectancy of these

HVAC units as well, are unnecessary added costs that can be saved

by using one unit and zoning.

Another reason for using one larger unit with zoning is to

economically obtain zoning and the highest efficiency HVAC

equipment. Often when multiple HVAC units are installed these

units are typically on the lower scale of efficiency. For heating this

is an 80% efficient furnace. For cooling this is a 10 SEER air

conditioning unit.



The standard way of not living in your whole house all of the time

and mostly occupying one zone of the home at a time proves the

need for zoning. Zoning makes the use of the heating and cooling

more effective by only conditioning those zones being occupied or

that may need it. Therefore typically the majority of the time, even

on a two zone system only one zone is typically calling.

When this occurs the furnace and air conditioner is oversized in BTU

capacity when supplying only a single zone. Due to this many

HVAC Installers will downsize the heating and/or cooling units

based upon the use of zoning. On a two zone system this many not

be recommended, however when using 3 or more zones it is

practical to downsize to the next lower capacity unit.

An HVAC Unit should be sized to heat and cool the home at design

temperatures (the hottest days in summer and the coldest days in

winter). Realistically how often do design conditions occur. Of

course this depends upon where you live. In the milder climates

downsizing is much more of a possibility than in the severe heating

climates of Northern states or the southern cooling climates.

HVAC installers have been quite successful in going to the next

smaller size unit when using zoning. In many cases heating and

cooling units are often oversized, especially on older homes. Doing

a heat loss and heat gain calculation is very important in determining

the size of the heating and cooling unit. Once the loads are

determined for the overall structure, the affect that zoning will have

on the overall load can be determined. Seldom used zones such as

basements or extra bedroom loads can be looked at as not always

needing conditioning at the same time as more often used zones. In

instances where 3 or more zones are used may be advantageous to

downsize to the next smaller size of heating and cooling unit.


NOTE: There are times during extended periods at design

temperatures where will take longer for the zones to satisfy as

the heating or cooling. It is important to note that some zones

would have to be adjusted in order to direct more BTUs to the

more important zones.


Down sizing while also increasing efficiency is often the best way to

go. When considering the alternative of using 2 separate lower

efficiency units in order to zone vs. one high efficiency unit with

zone damper system, the cost difference is negligible if not

sometimes less. Take for example the following scenario and price

out the costs comparison of the example below.

A 100,000BTU Home with 2 Zones.

Two Units @ 80% Efficiency vs. One Zoned 90% Efficiency

2Units 1 Unit

x 50,000 BTU Each (100,000 Total) x 90,000 BTU (Downsized)

x .8 (80% Efficiency) x .9 (90% Efficiency)

= 80,000BTU vs. = 81,000BTU

When you look at the two options you can still get more output,

with higher efficiency and still provide zoning. Combine this with

the potential utility rebates for the higher efficiency and that often

offsets the added cost of the zoning system. Even going to one

80,000BTU, 90% efficiency unit will only decrease the total output

by 10% . In milder climates this can be an approach to lower HVAC

installed costs when quoting against the competition with 2 lower

efficiency units.

Applying higher efficiency and zoning to cooling can also increase

the effectiveness of the cooling. Here again if utility rebates are

offered for the higher efficiency this can further offset the added cost

of zoning and possibly add other comfort options.

Typically the more zones you have the wider the diversity in the use

of the zones. This factor can help in downsizing the unit. Take for

example an exercise room that may only be used a hour or two a

day. The family recreation room that is only used for a few hours in

the evening and not when all are sleeping in the bedrooms or eating

in the kitchen dining room zones.

Zoning and high efficiency equipment can increase the overall

energy performance of your home and keep rising energy costs

down to manageable level.




At ZONEFIRST, we make zoning easy. We started zoning forced air

heating and cooling systems in the early 1960s, long before anyone

ever thought you could. It is only relatively recently that the major

OEMs have decided to adopt zone damper systems that more and

more companies have entered the zoning market. ZONEFIRST has

had a role in helping several companies enter the zoning business.

It has been our market and product knowledge over the years that

have set ZONEFIRST apart from the others. Let ZONEFIRST help

you to start installing forced air zoning on every new and retrofit

installation of HVAC Systems. You’ll be providing a benefit to your

customer, differentiating yourself from the competition and profiting

because of your knowledge and expertise in providing Room by

Room Comfort.

ZONEFIRST offers several methods of support for the installing

contractor through training materials, schools through your local

distributors; on-site training; our website and our


Toll Free Zoning Answer Man at:





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