Last reviewed: September 2026 · By the HVAC Brief Editorial Team · Our sourcing and editorial standards
HVAC stands for heating, ventilation and air conditioning: the systems that heat, cool and move air through a building. In a US home it usually means one connected system, a heat source, a cooling source and the ductwork and fan that distribute air.
Scale, from federal data: 109.5 million of 123.5 million US homes use air conditioning, gas furnaces heat 53.3 million, and 409,670 people work as HVAC mechanics and installers.
What the letters mean
| Letter | Function | Typical residential equipment |
|---|---|---|
| Heating | Adds heat to the space | Gas or electric furnace, heat pump, boiler |
| Ventilation | Exchanges and filters air | Ductwork, blower, filters, fresh air intake, exhaust fans |
| AC (air conditioning) | Removes heat and humidity | Central air conditioner, heat pump in cooling mode, mini split |
The ventilation letter is the one people skip, and it is the one that most often explains comfort complaints. A correctly sized furnace connected to undersized or leaking ductwork will still heat a house badly.
What counts as an HVAC system in a house
Most US homes run a split system: an outdoor unit containing the compressor and condenser coil, an indoor unit containing the evaporator coil and blower, and ductwork connecting them to the rooms. A single thermostat controls it.
A heat pump is the same architecture, but it can run the refrigerant cycle in both directions, so one machine both heats and cools. That is why heat pumps show up in both the heating and cooling statistics.
- Heat source. Gas furnace, electric furnace, heat pump or boiler.
- Cooling source. Air conditioner or heat pump.
- Air handler and ductwork. The blower and duct runs that distribute conditioned air.
- Controls. Thermostat and any zoning equipment.
- Filtration. The filter in the return, which is the part homeowners actually maintain.
How common is each type
Federal survey data gives the installed picture. Of 123.53 million US housing units, 109.51 million use air conditioning equipment, about 89%. On the heating side, natural gas central furnaces are the main equipment in 53.26 million homes and heat pumps in 16.13 million.
| Main heating equipment | Homes (million) | Share |
|---|---|---|
| Natural gas central furnace | 53.26 | 43.1% |
| Heat pump | 16.13 | 13.1% |
| Electric central furnace | 13.82 | 11.2% |
Heat pumps take a far larger share of new shipments than of the installed base, because equipment lasts a long time. Our shipment share analysis puts them near half of new central units against roughly 13% of homes.
Who works on it
The Bureau of Labor Statistics counted 409,670 heating, air conditioning and refrigeration mechanics and installers in May 2025, occupation code SOC 49-9021, at a median wage of $29.33 an hour. Counting everyone employed by plumbing, heating and air conditioning contractors, including office staff, the figure is about 1,355,400.
Frequently asked questions
What does HVAC stand for?
Heating, ventilation and air conditioning. It refers to the connected systems that heat a building, move and filter air through it, and cool it. In most US homes that means one split system with an outdoor unit, an indoor air handler, ductwork and a thermostat.
What is the difference between HVAC and air conditioning?
Air conditioning is one part of HVAC. HVAC covers heating and ventilation as well as cooling. A central air conditioner handles cooling only, while a furnace or heat pump provides heat and the ductwork and blower provide ventilation and distribution.
Is a heat pump an HVAC system?
Yes. A heat pump runs the refrigerant cycle in both directions, so a single machine provides both heating and cooling. It appears in both heating and cooling statistics. Heat pumps are the main heating equipment in 16.13 million US homes per EIA RECS 2020.
How many US homes have HVAC?
109.51 million of 123.53 million US housing units use air conditioning equipment, about 89%, per EIA RECS 2020 table HC7.1. Nearly all homes have some heating equipment, with natural gas central furnaces the most common at 53.26 million homes.
Methodology
Installed equipment figures are EIA Residential Energy Consumption Survey 2020, tables HC6.1 and HC7.1, final data released March 2023, the current published vintage. Employment and wages are BLS OEWS SOC 49-9021 for May 2025 and BLS Current Employment Statistics series CEU2023822001 for NAICS 238220. RECS runs every five or six years, so 2020 remains current and we do not extrapolate it forward.
Sources
- US Energy Information Administration, Residential Energy Consumption Survey 2020, tables HC6.1 and HC7.1.
- US Bureau of Labor Statistics, Occupational Employment and Wage Statistics, SOC 49-9021, May 2025; Current Employment Statistics, NAICS 238220.
The HVAC Brief is an independent trade publication. We do not sell equipment, take manufacturer advertising, or accept payment for placement in our research. Corrections welcome.
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