The quickest way to identify a heat pump
Look outside your home for a metal box or cylinder about the size of a large air conditioner unit. If you see one, you likely have a heat pump. The box will have a fan inside it and refrigerant lines (thin copper tubes) running from it into your house. If that box is there year-round and your home does not have a separate furnace, you have a heat pump.
The second step is to check your thermostat. Look for a label or setting that says "heat pump" or "auto" mode. If your thermostat has a setting specifically labeled for heat pump operation, that confirms it. Many modern thermostats will also display "heat pump" on the screen when the system is running.
If you are still unsure after checking outside and the thermostat, look at your utility bills or the paperwork that came with your home. The equipment list or HVAC documentation will name the system type. Your home inspector's report, if you have one, will also state whether the system is a heat pump, furnace, or other type.
Key Takeaways
- A heat pump is a single outdoor unit that heats and cools your home, not a furnace paired with an air conditioner.
- Check outside for a metal box with a fan and copper refrigerant lines running into your house year-round.
- Your thermostat may have a "heat pump" or "auto" setting that confirms the system type.
- Home inspection reports, HVAC paperwork, or utility bills will state the system type if you cannot identify it visually.
- If you have both an outdoor air conditioner unit and a separate furnace inside, you do not have a heat pump.
What to look for outside your home
Walk around the outside of your house and look for HVAC equipment. A heat pump outdoor unit looks similar to an air conditioner condenser — a metal box or cylinder with a fan grille on top. The difference is that a heat pump is the only outdoor unit you will see if that is your heating and cooling system. An air conditioner paired with a furnace means you have two separate systems, not a heat pump.
The outdoor unit should have copper or aluminum tubing running from it into your house through the wall or foundation. These are refrigerant lines. They are usually insulated with foam or rubber sleeves. If you see two sets of these lines — one thicker and one thinner — that is normal for a heat pump.
Check whether the outdoor unit runs in winter. Heat pumps run in cold weather to pull heat from the outside air and move it indoors. If your outdoor unit shuts down completely in winter and you have heat coming from somewhere else, you likely have a furnace, not a heat pump.
Checking your thermostat and indoor equipment
Your thermostat is one of the easiest places to confirm your system type. Look at the mode settings. Heat pump thermostats usually have options like "heat," "cool," "auto," and sometimes "emergency heat." The "auto" setting means the system will switch between heating and cooling on its own. If you see "emergency heat" as a separate option, that is a strong sign you have a heat pump, because that setting activates a backup heating element when outdoor temperatures are very cold.
Some thermostats display the system type on the screen itself. Programmable and smart thermostats often show "heat pump" in the settings menu or during setup. If you can access the thermostat's settings or manual, look for system type or equipment type information.
Inside your home, look for your main HVAC equipment. If you see a large metal box or cabinet in a basement, attic, or utility closet, check what it is. A furnace is a large box with a burner and ductwork. A heat pump indoor unit (called an air handler) is a box with a fan and coil but no burner. If you see no furnace at all and only an air handler, you have a heat pump system.
Understanding the difference between heat pumps and other systems
A heat pump is a single system that both heats and cools. It has one outdoor unit and one indoor unit. A traditional system has a furnace for heating and a separate air conditioner for cooling. The furnace is inside your home and burns fuel (gas, oil, or electric resistance). The air conditioner is outside. If you have both of these, you do not have a heat pump.
Some homes have a hybrid system that uses both a heat pump and a furnace. In this setup, the heat pump handles most heating and cooling, but the furnace kicks in during very cold weather. If you have both an outdoor heat pump unit and an indoor furnace, you have a hybrid system, not a pure heat pump. Your thermostat will show this by having both heat pump and furnace settings available.
Ductless heat pumps (also called mini-splits) are different in appearance. Instead of one large indoor unit, they have small wall-mounted or ceiling-mounted units in individual rooms. Each indoor unit connects to an outdoor compressor via small refrigerant lines. If you see small rectangular boxes mounted on your walls with tubing running outside, you may have a ductless heat pump.
Where to find documentation about your system
Your home purchase paperwork or home inspection report will list the HVAC system type. Look for the section titled "Heating and Cooling" or "HVAC Systems." The inspector will state whether you have a heat pump, furnace and air conditioner, or another type of system. If you do not have an inspection report, ask the previous homeowner or real estate agent for HVAC documentation.
Check your utility bills or account information. Some utility companies list the heating fuel type and equipment on your account. If your bill says "electric heat" or "heat pump heating," that is confirmation. Gas bills indicate you have a gas furnace, not a heat pump.
Look for the original equipment manual or warranty paperwork. These documents will have the manufacturer name and model number of your HVAC system. The model number can be looked up online to confirm whether it is a heat pump, furnace, or air conditioner. The equipment label is usually on the outdoor unit or indoor unit itself — it is a metal plate with the brand name and specifications.
What to do if you still cannot identify your system
If you have checked outside, looked at your thermostat, and reviewed your paperwork but still are not sure, contact an HVAC technician. A professional can identify your system in minutes by looking at the equipment and checking the model number. Many technicians offer free phone consultations and can tell you over the phone what you have based on your description.
You can also call your local utility company. They have records of what heating system is in your home based on your account history and fuel type. They can tell you whether you have electric heat (which could be a heat pump or electric furnace) or gas heat (which means a furnace).
If you are renting, contact your landlord or property manager. They should have the HVAC documentation and can tell you what system heats and cools the building. This information is useful if you need to report a heating or cooling problem.
Frequently Asked Questions
Can a heat pump be hidden inside my home where I cannot see it?
The outdoor unit cannot be hidden — it must be outside to exchange heat with the air. However, the indoor unit might be in a basement, attic, or utility closet where you do not see it daily. If you cannot find an indoor furnace or air handler, check these spaces. The outdoor unit is the easiest way to confirm you have a heat pump.
What if I see an outdoor unit but I am not sure if it is a heat pump or air conditioner?
Check whether the unit runs in winter. Air conditioners shut down in cold weather. Heat pumps run year-round, including in winter, because they heat your home by moving outdoor air inside. If the unit is silent and inactive all winter, it is an air conditioner. If it runs when it is cold outside, it is a heat pump.
Does a heat pump always have a thermostat with an "auto" setting?
Most heat pump thermostats have an auto mode, but not all. Older heat pump systems may have simpler thermostats with only heat and cool buttons. The most reliable way to confirm is to look at the outdoor unit or check your home documentation, not just the thermostat settings.
If I have a ductless system with wall units, is that definitely a heat pump?
Not always. Ductless systems can be heat pumps or cooling-only air conditioners. Look at the outdoor unit. If it is present year-round and the wall units provide heat in winter, it is a ductless heat pump. If the outdoor unit shuts down in winter and you have no heat from the wall units, it is a cooling-only system.
Can I have a heat pump if my home uses gas for other appliances?
Yes. A heat pump uses electricity to heat and cool your home, even if you have a gas water heater, gas stove, or gas dryer. The presence of gas in your home does not mean you have a gas furnace. Check your heating system specifically by looking at the outdoor unit and indoor equipment.