What Is a Heat Pump and How Does It Work?
A plain-English explanation of what a heat pump is, how it heats and cools your home with one system, and why it's so efficient in the Pacific Northwest.
Heat pumps are everywhere in HVAC conversations right now, but a lot of homeowners aren't sure what one actually is. Here's the plain-English version.
The one-sentence answer
A heat pump is a single system that both heats and cools your home by moving heat from one place to another instead of burning fuel to create it.
How it actually works
Think of your refrigerator. It moves heat out of the cold box and dumps it into your kitchen — that's why the back of the fridge is warm. A heat pump does the same thing, just on a whole-home scale and in both directions.
- In winter: Even cold outdoor air contains heat energy. The heat pump extracts that heat and moves it inside to warm your home.
- In summer: It runs in reverse, pulling heat out of your home and releasing it outside — cooling the house like an air conditioner.
It does this using refrigerant, a compressor, and two coils (one inside, one outside). The magic is that moving heat takes far less energy than making it by burning gas or running electric resistance heat.
Why one system for both jobs matters
A traditional setup is two machines: a furnace for heat and an air conditioner for cooling. A heat pump replaces both. That means one system to install, maintain, and eventually replace — and you get air conditioning built in, which matters more every summer here.
Why it's efficient — especially in our climate
Because a heat pump moves heat rather than generating it, it can deliver several units of heat energy for every unit of electricity it uses. That's why switching from electric baseboard or an electric furnace to a heat pump often lowers winter bills.
And the Pacific Northwest is close to ideal for them. Our winters are cool and damp rather than brutally cold — right in the range where heat pumps are most efficient. (More on that in Do Heat Pumps Actually Work in Cold Weather?)
The types you'll hear about
- Ducted heat pump: Uses your home's existing ductwork to distribute air, like a central system.
- Ductless mini-split: Skips ducts entirely, using wall- or ceiling-mounted indoor heads. Great for homes without ducts or for zoning. (See Ductless vs. Central Air)
- Dual-fuel (hybrid): Pairs a heat pump with a gas furnace for backup on the coldest nights. (See Furnace vs. Heat Pump vs. Dual Fuel)
Are they worth it?
For most Western Washington homes, yes — one efficient system for year-round comfort, plus the largest PSE rebates and a federal tax credit to offset the cost. See PSE Rebates Explained and How Much Does a Heat Pump Cost in Western Washington?.
Curious whether a heat pump is right for your home? Request a free estimate or call (360) 825-0800.
More resources
Do Heat Pumps Actually Work in Cold Weather?
The honest answer for Western Washington: yes. Here's how modern heat pumps handle cold Pacific Northwest winters, and what changes in the foothills.
Do Heat Pumps Actually Work in Western Washington?
The honest answer about heat pump performance in our climate — including when they make sense and when they don't.
Ductless Mini-Splits vs. Central Air: Which Is Right for Your Home?
A clear comparison of ductless mini-splits and central (ducted) systems for Western Washington homes — cost, comfort, efficiency, and when each one wins.
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