At Sub Zero Temp Control, one of the most common questions we get is: how do I know if I have a heat pump? It’s an honest question—and a surprisingly common one. Heat pumps often look just like regular air conditioners, and many homeowners inherit their HVAC system without knowing how it works. If you’re not sure what kind of system you have, don’t worry—we’ll walk you through how to find out.
Why It’s Important to Know What System You Have
Knowing your HVAC system helps you manage comfort, efficiency, and repairs. Heat pumps offer both heating and cooling, so the way they function is very different from traditional units. If you’ve ever wondered how to know if you have a heat pump, you’re not alone.
According to Energy.gov, a heat pump can reduce electricity use for heating by up to 75% compared to electric resistance heating. That’s a major advantage, especially in milder climates.
How Do I Know If I Have a Heat Pump or Just AC?
Here’s a simple trick: set your thermostat to heat mode and raise the temperature. Then, go outside and see if the outdoor unit kicks on. If it runs while heating, you likely have a heat pump. A standard air conditioner won’t operate during heating mode.
Check the Model Number on the Outdoor Unit
Another easy way to find out is by checking the label on the outdoor unit. Look for words like “heat pump” or abbreviations like “HP” in the model number. You can usually find this label on the side or back of the unit.
How Do I Know If I Have a Heat Pump Inside the Home?
There are indoor signs too. First, check for a gas line. If your home doesn’t use natural gas and still heats in winter, chances are you have a heat pump paired with an air handler. These systems often contain electric heat strips and a defrost control board.
Thermostat Clues
Look closely at your thermostat. If you see “auxiliary heat” or “emergency heat” modes, that’s a strong indicator of a heat pump. These backup settings are standard features that kick in when the heat pump needs support on very cold days.
Call a Technician to Be Sure
Still unsure? You’re not alone. If you’re still wondering how to know if you have a heat pump, calling in a professional is the most reliable option. At Sub Zero Temp Control, we offer fast, affordable system inspections. We’ll identify your setup, explain how it works, and help you understand your options for efficiency and maintenance.
Key Features That Identify Heat Pumps
Provides Both Heating and Cooling
A traditional AC cools only. A heat pump does both—one outdoor unit handles all your comfort needs. This makes it ideal for year-round efficiency.
Outdoor Unit Runs in Winter
Heat pumps operate even when it’s cold out. If you see your outdoor unit running during winter, that’s a telltale sign.
Has a Defrost Mode
Ever hear a “whoosh” or click in winter? That’s likely the defrost cycle. Heat pumps defrost themselves to keep running smoothly in cold weather.
What If You Don’t Have a Heat Pump?
If your system turns out to be a traditional AC and furnace setup, that’s okay! But it might be time to explore whether a heat pump could be right for your home.
ENERGY STAR certified heat pumps are incredibly efficient and often eligible for tax credits and rebates. Plus, newer models work well even in colder climates.
Tips to Get the Most from Your System
Whether you have a heat pump or not, these simple habits can boost efficiency:
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Use a smart thermostat to regulate temperature
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Replace your air filters every 1–3 months
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Keep the outdoor unit clean and unobstructed
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Schedule seasonal maintenance with an HVAC pro
The U.S. Department of Energy also recommends programmable thermostats to save energy without sacrificing comfort.
Need help? At Sub Zero Temp Control, we service systems of all kinds and offer guidance for optimizing performance.
Final Thoughts: How Do I Know If I Have a Heat Pump?
If you’re still wondering how to know if you have a heat pump, don’t overthink it—there are a few simple signs to look for. From checking your outdoor unit to inspecting your thermostat, identifying your system can be quick and stress-free.
But when in doubt, call the pros. At Sub Zero Temp Control, we help homeowners make sense of their HVAC systems—so you can stay comfortable year-round without the guesswork.
We’re proudly based in Vancouver, WA, and we serve the surrounding communities with honest, expert service. Contact Sub Zero Temp Control today to schedule your heat pump inspection. We’re here to help.
