non-descriptive image


Understand the terminology you need to help you choose the right products for your home. Browse our glossary to get clarity on any questions you may have.

AFUE measures a gas furnace's efficiency in converting fuel to energy.

ASHRAE Certification

ASHRAE was formed as the American Society of Heating, Refrigerating and Air-Conditioning Engineers in 1959 by the merger of the American Society of Heating and Air-Conditioning Engineers (ASHAE) and The American Society of Refrigerating Engineers (ASRE).

Air Handler

An air handler circulates the air inside your home. It’s the indoor unit of your heating and cooling system and the more efficient it is, the less work your outdoor unit has to do to keep your home comfortable.


One British Thermal Unit (BTU) represents the amount of heat required to raise or lower the temperature of one pound of water one degree Fahrenheit. The heat extracted from your home by an air conditioner is measured in BTUs.


BTUH is a measure of how much heat an air conditioner can remove from a room in a given hour.

Central Air Conditioning

Also known as Central A/C, Central Air Conditioning Systems cool air in a central location and distribute the air to many or multiple rooms using fans and ductwork.

Charter Member

Our Trane Comfort Specialist™ program is dedicated to achieving excellence in service and customer satisfaction. Charter members have been committed to these values since the inception of this program in 1998.

Clean Air Delivery Rate

Clean Air Delivery Rate (CADR) is the number of cubic feet of clean air that an air filtration system delivers in a minute. The CADR is recognized across the industry as the indicator for air filter efficiency.

Climatuff™ Compressor

The Trane Climatuff™ compressor was the world's first successful heat pump compressor. It is part of your outdoor unit, and it pumps refrigerant in order to meet the cooling requirements of the system.

Condenser Coil

The condenser coil is one of two coils in your air conditioning or heat pump system, through which heat is removed from the refrigerant.

Connected control

A connected control does more than just monitor and adjust temperature settings. Trane connected controls can manage energy use, adjust temperature and humidity levels by room and floor, turn on and off lights, lock and unlock doors and check security cameras. All of this can be managed remotely via internet-enabled computers, tablets and most smartphones.


A decibel (dB) is used to measure the intensity of sound.

Dual Fuel Heat Pump

A dual fuel heat pump combines an electric heat pump and a gas furnace to efficiently warm your home based on the temperature outside.

Ductless AC

A ductless ac unit (also called a mini split system) is a product that delivers cool air to a single room, or several rooms, where ductwork isn’t possible or wanted. Ductless AC units are a great option for new additions, sunrooms, garages or areas of the home that need to be cooler.

Ductless HVAC System

A ductless HVAC system or mini split is a heating and cooling system designed to deliver warm or cool air to a single room or several without the need for connective ductwork. Mini split systems are a great option for room additions, sunrooms, garages or areas of the home that need to be warmer or cooler.


Ductwork is the system or metal or synthetic tubes, or ducts, used to bring air from your heating and cooling equipment to and throughout your home


Energy Efficiency Ratio is the measurement of the efficiency of your air conditioning system. The higher your Energy Efficiency Ratio, the more efficient your system.

Electronic Air Cleaner

Air cleaners, sometimes called air purifiers, reduce the number of contaminants in your home’s air.


ENERGY STAR is a government-backed program that helps businesses and individuals reduce energy costs and protect the environment through energy efficiency.

Energy tax credit

A fan coil unit (FCU), or vertical fan coil-unit (VFC), is a device that uses a coil and fan to heat or cool a room without ductwork.

Evaporator Coil

An evaporator coil is the component of your heat pump or air conditioner that absorbs the heat from the air inside your house

Fan Coil Unit

Split systems divide heating and cooling systems into separate entities, such as a heat pump and a furnace that work together.


FER stands for Fan Energy Ratings and is a federal regulation that sets a minimum airflow efficiency standard for residential furnace fans and gas packaged units. As of July 3, 2019, furnaces and gas packaged units cannot be manufactured unless they meet the FER standard.


A furnace is a home heating product that delivers warm air throughout a home. In a central heating system, the warm air is delivered via a connected system of ductwork.

Heat Pump

A heat pump, as part of a central heating and cooling system, uses the outside air to efficiently heat your home in the winter and cool it in the summer. Unlike a furnace, a heat pump doesn’t burn fuel to make heat. It simply uses electricity to move heat from one place to another.

Horizontal Flow Furnace

A horizontal flow furnace refers to the direction in which heated air leaves the furnace and enters your ductwork so that it can be dispersed through your home.


The Heating Seasonal Performance Factor (HSPF) is used to measure the efficiency of heat pump.


A humidifier is a device to increase humidity and moisture in your home.


A humidistat, also known as a humidistat control or hygrostat, works with the heating and cooling system of your home to control the amount of moisture or humidity in the air.


HVAC stands for Heating, Ventilation, and Air Conditioning.

HVAC Damper

An hvac damper is a small valve or plate that blocks the flow of air through a duct or air handler in order to cut off air conditioning or heating to a specific room that isn’t being used.

Hybrid System

A Hybrid dual fuel system is an electric heat pump combined with a gas furnace. A heat pump is the main source of heat for the home and the furnace will turn on when colder outdoor temperatures are reached.

Matched System

A matched system is the combination of Trane products as every part of your system. Depending on your region, a matched system can be composed of the following: an air conditioner and furnace , a heat pump and furnace, a heat pump and air handler , an air conditioner and air handler, or an all-in-one “packaged” system. By combining Trane components that are made to work seamlessly together, you can create a more efficient ideal system.


Allergens like dust, smoke and bacteria are particulates that are often .3 microns or less. At that size, they can get deep into your lungs, because they aren’t filtered well by your nose and throat. If you’re concerned about controlling those airborne particulates, it’s good for you to know that Trane CleanEffects® Whole Home Air Cleaner removes 99.98% of particulates, all particulates, from the air inside your home.

NATE Certified

NATE (North American Technician Excellence) is an independent organization that certifies installation or service technicians with a knowledge-based test.

Oil Furnace

An oil furnace is the heating component in some systems in colder climates, most commonly in the northeastern United States, that converts oil to heat.

Packaged System

Packaged systems are all-in-one solutions, with most of the components for heating and/or cooling housed in a single cabinet.


"Particulates" is a label used for particles that are really, really small. Some particulates are visible to the naked eye, but most are only visible through a microscope: mold spores, skin flakes, bacteria, household dust, pet dander, tobacco smoke, cooking smoke.

Pleated Filter

Pleated filters are part of your indoor air quality system. They filter dirt, pollutants and other particles, leaving you with cleaner air.

Programmable Thermostat

Programmable thermostats feature intuitive controls and settings you can manage from one single access point or by app depending on the model.


An older refrigerant also known as Freon that has been restricted in the US due to its environmental impact.

R-410a Refrigerant

R-410a is a new type of refrigerant created to replace traditional Freon refrigerant, dubbed R-22.


Gas or liquid coolant that absorbs heat from the surrounding air to provide cooling to your system.

Refrigerant lines

Refrigerant lines are insulated copper lines that transport refrigerant between your outdoor and indoor ac or heat pump units.


Split systems divide heating and cooling systems into separate entities, such as a heat pump and a furnace that work together.

Scroll Compressor

A scroll compressor is a specific type of compressor that works by rotating pieces of metal instead of operating like a piston in an engine.


Seasonal Energy Efficiency Rating

Single-stage heating

Single-stage heating means a furnace has one level for heat output, regardless of the temperature outside your home.

Smart home

Smart homes are modern homes installed with communicating technology that have controls accessible via internet-enabled computers, smartphones or tablets. They allow you to monitor temperatures and manage energy use for optimal efficiency and comfort. Some systems even link into security features like locks, lights and cameras.

Spine Fin™ Coil

Our exclusive patented Spine Fin™ all-aluminum outdoor coil provides greater heat-exchanging capabilities (meaning higher efficiencies) and is more resistant to corrosion than a traditional copper/aluminum coil.

Two-stage heating

Zoning systems split your home into various zones so that they can be either heated or cooled separately.

Variable-speed motor

A variable-speed motor inside your air handler or air conditioner can run at a wide range of speeds, giving you precise control over the temperature in your home.

Zoning System

Zoning systems split your home into various zones so that they can be either heated or cooled separately.

Contact a local Trane Comfort Specialist™



Let us know how we can help and the top-rated Trane Comfort Specialist™ in your area will contact you shortly.

By pressing the “Submit” button, I consent to receive a phone call about products and services from a Trane Comfort Specialist™ at the phone number(s) provided. I understand these calls may be generated using automated technology and my consent does not imply or require that a purchase be made.

Still have questions?

Here's what your dealer can do for you

  • Custom evaluation
  • Local rebates
  • Expert repairs
  • Upfront pricing