Glossary

AC installation

Useful HVAC Glossary

It's always a good idea to know some of the useful terms related to HVAC to understand the operation of your heating and cooling system.

Check out the some of the important HVAC terms given below:

A

AFUE
Annual Fuel Utilization Efficiency. Indicated as a percentage, your furnaces AFUE tells you how much energy is being converted to heat. For example, an AFUE of 90 means that 90% of the fuel is being used to warm your home, while the other 10% escapes as exhaust with the combustion gases.
 
Advanced Reciprocating Compressor
Type of compressor that uses a more efficient process for compressing refrigerant for better cooling efficiency.
 
Air Handler
The portion of your air conditioner or heating system that forces air through your home's ductwork.

B

BTU
British Thermal Unit. Used for both heating and cooling, BTU is a measure of the heat given off when fuel is combusted. Or for cooling, it's a measure of heat extracted from your home. (One BTU is approximately equal to the heat given off by a wooden kitchen match.)
 
BTUH 
A British Thermal Unit (BTU) is the unit of heat required to raise 1 pound of water by 1 degree Fahrenheit. BTUH is British Thermal Units per hour.

C

CFM
Stands for Cubic Feet per Minute. A measurement of airflow that indicates how many cubic feet of air pass by a stationary point in one minute. The higher the number, the more air is being forced through the system.
 
Capacity 
The ability of a heating or cooling system to heat or cool a given amount of space. For heating, this is usually expressed in BTUs. For cooling, it is usually given in tons.
 
Carbon Monoxide 
A colorless, odorless, highly poisonous gas produced when carbon-based fuels, such as natural gas. It burns without sufficient air nearby.
 
ComfortHeat 
Carrier's exclusive ComfortHeat technology accurately predicts the need for heating while cutting temperature swings in half.
 
ComfortHeat Pump System 
ComfortHeat Pump System is Carrier's exclusive heat pump system that provides significantly warmer supply of air from the registers for enhanced occupant comfort.
 
Compressor 
Part of a split-system heat pump or air conditioner's outdoor unit that controls the pressure applied to the refrigerant, necessary for taking in heat to warm your home with a heat pump or getting rid of heat to keep your home cool.
 
Condenser Coil 
This is a part of the outdoor portion of a split-system air conditioner or heat pump. By converting refrigerant that is in a gas form back to a liquid, the coil sends heat carried by the refrigerant to the outside.

D

DB 
Decibels (dB) are a unit measuring the intensity of noise.
 
Damper 
A type of "valve" used in duct work that opens or closes to control airflow. Used in zoning to control the amount of warm or cool air entering certain areas of your home.
 
Downflow 
A type of furnace that takes cool air from the top and blows warm air to the bottom. It is commonly used where furnaces must be located in a second-floor closet or utility area.
 
Ductwork 
Hollow pipes used to transfer air from the air handler to the air vents throughout your home. Ductwork is one of the most important components of a home heating and cooling system.

E

EER 
Energy Efficiency Ratings (EER) measure the efficiency with which a product uses energy to function. It is calculated by dividing a product's BTU output by its wattage.
 
Electronic Air Cleaner (EAC) 
An electronic device that filters out large particles and contaminants in indoor air. It then electronically pulls out tiny particles that have been magnetized, such as viruses and bacteria, drawing them to a collector plate.
 
Energy Saver Switch 
An energy-saver switch causes the air conditioner's fan and compressor to cycle on and off together reducing energy use.
 
Energy Star 
Energy Star is a government-backed program helping businesses and individuals protect the environment through superior energy efficiency. Products with the Energy Star rating will be efficient and save cost on energy bills.
 
Evaporator Coil 
Part of a split-system air conditioner or heat pump located indoors. The evaporator coil cools and dehumidifies the air by converting liquid refrigerant into a gas (or vice-versa). A blower motor, typically in a furnace, moves air over the coil to either heat or cool your home.

F

Fan Coil 
An indoor component of an air conditioner or heat pump system, fan coil is used in place of a furnace and evaporator coil to provide change the refrigerant from gas to liquid (or vice-versa) and blow air over the coil to cool or heat your home.

H

HSPF 
The Heating Seasonal Performance Factor is a measure of the heating efficiency of a heat pump. The higher the HSPF number, the more efficiently the heat pump heats your home.
 
HVAC 
Term used for Heating, Ventilation and Air-Conditioning.
 
Heat Exchanger 
The part of a furnace that transfers heat to the nearby air.
 
Heat Pump 
A product that works just like an air conditioner in cooling mode; however, in heating mode, the refrigerant flow is reversed and heat is extracted from the outside air to heat your home.
 
Horizontal Flow 
A type of furnace, installed on its "side," which draws in air from one side, heats it and sends the warm air out the other side. Most often used for installations in attics or crawl spaces
 
Humidifier 
A piece of equipment that adds water vapor to heated air as it moves out of the furnace. This adds necessary moisture to protect your furnishings and reduce static electricity.
 
Hybrid Heat 
Hybrid Heat systems deliver exceptional performance by using a heating source that provides the most energy-efficient comfort during moderate heating conditions.

I

Ideal Defrost 
IdealDefrost is Carrier's proprietary defrost management innovation for maintaining the ideal defrost interval for a heat pump enhancing comfort and efficiency.
 
IdealHumidity 
IdealHumidity™ is Carrier's proprietary humidity management innovation for maintaining the ideal comfort in a home.

Indoor Coil

L

Load Estimate 
A series of studies will be performed to determine the heating or cooling requirements of your home. An energy load analysis uses information such as the square footage of your home, window or door areas, insulation quality and local climate to determine the heating and cooling capacity needed by your furnace, heat pump or air conditioner. 

When referring to heating, this is often known as a heat loss analysis, because a home's heating requirements are determined by the amount of heat lost through the roof, entry ways and walls.

M

MERV 
The Minimum Efficiency Reporting Value is the standard comparison of the efficiency of an air filter. The MERV scale ranges from 1 (least efficient) to 16 (most efficient) and measures a filter's ability to remove particles from 3 to 10 microns in size.
 
Matched System 
A heating and cooling system comprised of products that have been certified to perform at promised comfort and efficiency levels when used together and used according to design and engineering specifications.

O

Operating Cost 
The day-to-day cost of running your home comfort equipment based on energy use.
 
Outdoor Coil

P

Payback Analysis 
Overall measure of the efficiency and value of your home comfort system. By combining your purchase price and ongoing operating costs, a payback analysis determines the number of years required before monthly energy savings offset the purchase price.
 
PerfectHeat 
The PerfectHeat® gas furnaces use a two-stage valve and patented control algorithm allowing the furnace to more closely meet the heating needs of the home. 

A PerfectHeat heat pump controls the airflow across the indoor coil and controls auxiliary heater banks to deliver warmer, more comfortable air to the home. In both cases, the end result is even, consistent heating.
 
PerfectLight 
PerfectLight is an advanced gas furnace ignition system that replaces standard pilot lights and improves upon traditional modern igniters used by other manufacturers.
 
Puron Refrigerant 
Puron® Refrigerant is an environmentally sound refrigerant designed not to harm the earth's ozone layer. Federal law requires that all manufacturers phase out ozone-depleting refrigerants in the next few years. Puron Refrigerant is approved by the US Environmental Protection Agency as a replacement from Freon 22.

Q

QuieTech 
QuieTech™ is a noise reduction system that provides comfortable heat while generating very little noise in the process.

R

R-22 refrigerant 
R-22 is a single component HCFC refrigerant with low ozone depletion potential. It has long been used in a variety of air-conditioning and refrigeration applications in a variety of markets. Production of R-22 has been ceased in 2015 per the Montreal Protocol.
 
Reciprocating Compressor 
A type of compressor used in air conditioners that compress refrigerant by using a type of "piston" action.
 
Reclaiming 
Returning used refrigerant to the manufacturer for disposal or reuse.
 
Recycling 
Removing, cleaning and reusing refrigerant.
 
Refrigerant Lines 
Two copper lines that connect the Condenser (Outdoor) Coil to the Evaporator (Indoor) Coil.
 
Riello Burner 
A burner assembly within your oil furnace, manufactured by Riello to exact specifications of Carrier. This burner provides a cleaner, higher quality combustion of heating oil to increase energy efficiency.

s

SEER 
The Seasonal Energy Efficiency Ratio is a measure of the cooling efficiency of your air conditioner or heat pump. The higher the SEER number, the more efficient the system is at converting electricity into cooling power.
 
Scroll Compressor 
A specially designed compressor that works in a circular motion vs an up and down piston action.
 
Setback Thermostat 
A state-of-the-art electronic thermostat with a built-in memory that can be programmed for different temperature settings at different times of the day.
 
Silencer System 
Carrier Silencer System II ensures quite operation on the inside and outside. Our systems meet or exceed local and industry sound standards with quiet motor mounts, a compressor sound blanket, forward-swept fan blades, a laminated sound elimination compressor mounting plate and a unique top with integrated silencer airflow baffle.
 
Single Package Product 
One outdoor unit that contains both a heating and a cooling system.
 
SmartRecovery 
SmartRecovery starts the system in advance to be sure that each zone reaches your selected temperature setting at the scheduled time.
 
Split System 
Refers to an air conditioner or heat pump that has components in two locations. Usually, one part of the system is located inside (evaporator coil) and the other is located outside your home (condenser coil).

T

Thermidistat 
The Thermidistat™ Control monitors temperatures both inside and outside, as well as indoor humidity and adjusts system operation to maintain the temperature and humidity levels set by the homeowner.
 
Thermostat 
Unit that monitors and controls your HVAC system products.
 
Thermostatic Expansion Valve 
A thermostatic expansion valve (TXV) is a precision device used to measure the flow of liquid refrigerant entering the evaporator at a rate that matches the amount of refrigerant being boiled off in the evaporator.
 
Ton 
A unit of measure for cooling capacity. One ton = 12,000 BTUs per hour.
 
Total Home Comfort System 
The ultimate solution of providing you with consistent, customized home comfort despite the ever-changing weather.
 
TrueSense Dirty Filter Detection 
TrueSense dirty filter detection reminds you when it's time to change your media filter.
 
Two Stage Compressor 
Two Stage Compressors are capable of two levels of operation, a low stage and a high stage. Properly sized equipment will operate 80% of the time in the low stage, enhancing efficiency and comfort with lower humidity levels and quieter operation. It's like getting two air conditioners or heat pumps in one system.

U

UL 
UL is an objective, non-profit organization that tests and rates electrical products for public safety.
 
Upflow 
A type of furnace that draws cool air from the bottom and blows the warmed air out the top into the duct work. This type of furnace is usually installed in a basement or an out-of-the-way closet.

V

Ventilator
A ventilator captures heating or cooling energy from the stale indoor air and transfers it to fresh incoming air.

W

WeatherArmor 
WeatherArmor™ is a Carrier innovation that protects outdoor units from weather and increases durability.

Z

Zone Perfect Plus 
Our exclusive zoning system, designed to work in conjunction with properly matched HVAC products to enhance energy efficiency by as much as 30%.
 
Zoning 
A way to increase your home comfort and energy efficiency by controlling when and where heating and cooling occurs in a home. Programmable thermostats are used to control operating times of the equipment. Dampers are used to direct air flow to certain parts or "zones" of the home.
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