Heating & Cooling Basics
How does a heat pump actually work?
The plain-English version of how one system can both heat and cool your Des Moines home — and why heat pumps are showing up on more IA houses every year.
A heat pump doesn’t make heat by burning fuel — it moves heat from one place to another using refrigerant, a compressor, and a reversing valve. In winter it pulls heat out of the outdoor air (yes, even cold Iowa air) and releases it inside; in summer it runs in reverse and pulls heat out of your home. Because a single system both heats and cools, heat pumps keep showing up on more Des Moines-area homes every year.
The main parts, and what each one does
A heat pump is essentially a refrigerator that can run in both directions. Five parts do the work:
- Outdoor unit. Holds the compressor and a coil. In winter it absorbs heat from the outside air; in summer it dumps heat outside.
- Indoor coil and air handler. Releases heat into your home in winter and absorbs it in summer, while the blower moves conditioned air through your ducts.
- Refrigerant. A fluid that carries heat as it cycles between the two coils, changing between liquid and gas along the way.
- Reversing valve. The part that flips the system between heating and cooling by changing the direction the refrigerant flows.
- Thermostat. Tells the system when to run and which mode it should be in.
Heating mode vs. cooling mode
In winter (heating)
The outdoor coil pulls heat from the outside air and the refrigerant carries it indoors, where the indoor coil releases it into your home.
In summer (cooling)
The reversing valve flips the flow: the indoor coil absorbs heat from your home and the outdoor unit releases it outside, just like an air conditioner.
Why people choose them
Because it moves heat instead of creating it, a heat pump can deliver more heating energy than the electricity it uses — one reason it can be an efficient way to heat in milder weather. How well it performs in deep cold depends on the equipment and the install, which matters a lot in IA. Curious whether one can handle a Des Moines winter? See heat pumps in Iowa winters and dual-fuel heating .
Iowa myth vs. truth
Myth: “Heat pumps don’t work in cold places like Iowa.”
Older heat pumps did struggle in deep cold, which is where the reputation came from. Today’s cold-climate models are designed to keep heating well below freezing, and for Iowa’s coldest sub-zero nights many homes pair one with a gas furnace so the furnace handles the extremes. The technology caught up to the climate.
Thinking about a heat pump for your Des Moines home?
We can walk you through whether a heat pump — or a dual-fuel setup — fits your home, your comfort, and your budget. Financing is available through Optimus.
Common questions
How does a heat pump heat a home in winter?
Even cold air holds heat. A heat pump uses refrigerant and a compressor to absorb that heat from the outdoor air and move it inside. A reversing valve then lets the same system run backward to cool your home in summer, so it transfers heat rather than burning fuel to create it.
Is a heat pump the same as an air conditioner?
They work almost identically, and both move heat with refrigerant. The difference is that a heat pump adds a reversing valve, so it can run in both directions: cooling in summer and heating in winter. An air conditioner only cools.
Do heat pumps work in IA cold winters?
Yes. Modern cold-climate heat pumps are built to keep heating well below freezing. For the coldest sub-zero stretches, many Iowa homes pair one with a gas furnace in a dual-fuel setup so the furnace handles the extremes.
Is a heat pump more efficient than a furnace?
Because a heat pump moves heat instead of creating it, it can deliver more heating energy than the electricity it uses, which makes it an efficient way to heat in milder weather. How it compares in deep cold depends on the equipment, the install, and local energy prices.