HVAC basics · August 2026 · HVAC Iowa City
What is a heat pump, and does one fit an Iowa City home?
A heat pump is a single system that both heats and cools your house, and the surprising part is how it heats: not by burning fuel, but by moving heat from one place to another. In summer it pulls heat out of your indoor air and dumps it outside, exactly like an air conditioner. In winter it runs in reverse, pulling heat out of the cold outdoor air and bringing it inside. That "heat from cold air" trick is the whole idea, and it is why a heat pump can deliver more heating energy than the electricity it uses.
Mechanically, a heat pump looks a lot like central air conditioning: a box outside, a coil inside, and copper lines carrying refrigerant between them. The difference is a reversing valve that lets the refrigerant flow either direction. That one part is what turns an air conditioner into a machine that also heats. If you want the wider picture of how a home system fits together, our plain-English HVAC explainer covers the furnace, the AC, and the ductwork.
The old knock on heat pumps was cold weather, and in Iowa City cold weather is the fair question. The town sees a normal winter low near 17.7 degrees, per the NWS climate normals for the Iowa City station. Early heat pumps genuinely struggled at those temperatures. Modern cold-climate models are a different machine, engineered to keep pulling useful heat well below freezing. The honest plan in our climate pairs the heat pump with a backup heat source for the very coldest nights, so the house is covered no matter what January does.
There are two common shapes. A ducted heat pump uses the ductwork you already have, which makes it the natural replacement when an aging central air conditioner dies and you want cooling plus efficient heat from one system. A ductless heat pump, often called a mini split, skips ducts entirely and serves a room or a zone directly. That is the fix for an addition, a finished attic, a garage, or an older house that never had ductwork. We cover that setup on mini splits and ductless. A ground-source version, which trades outdoor air for the steady temperature of the earth, is covered on geothermal.
Does one make sense for your house? It depends on what you have now. About two thirds of Iowa City homes heat with gas, per Census Bureau housing data, and a house with a healthy gas furnace and an old air conditioner is a classic candidate: replace the dying AC with a ducted heat pump, keep the furnace as backup, and let the heat pump carry the milder months efficiently. A house with no ductwork, or a specific room that never gets comfortable, points toward ductless instead.
A few things a heat pump is not. It is not a space heater, and it is not an emergency fix for a dead furnace tonight. It is a planned choice, made best when your cooling or heating equipment is near the end of its life anyway and you are deciding what replaces it. It also is not automatically cheaper to run than gas in every case. Whether it saves you money depends on your electric rates, your gas rates, and how tight your house is. Anyone who promises guaranteed savings without looking at your bills is selling, not advising.
So the plain-English version: a heat pump is one system that heats and cools by moving heat rather than making it, modern ones handle Iowa City winters with a backup for the coldest nights, and the right fit depends on your ductwork and the equipment you are replacing. If you want that judgment for your own house, we will look at what you have and give you the honest read, in writing, on our heat pumps page.