Heat pump vs Furnace in Twin Falls County, Idaho
When a heat pump makes sense
If your home already has gas heat but you want air conditioning too, a cold-climate heat pump is worth a look. It's built to keep making heat when standard models start to struggle in the cold, and it covers your cooling in the same unit. You'll still want to weigh the running cost against gas here, since electricity runs higher for the roughly nine months a year you're heating.
When a furnace makes sense
If you're heating with gas already, or have a gas line to the house, a furnace is the straightforward choice here. It costs at least 30% less to run on natural gas than a heat pump at Idaho prices, and it doesn't lose output when winter nights drop to 21°F. It won't cool your home in summer, so you'd need a separate air conditioner for that.
When a heat pump makes sense
If your home already has gas heat but you want air conditioning too, a cold-climate heat pump is worth a look. It's built to keep making heat when standard models start to struggle in the cold, and it covers your cooling in the same unit. You'll still want to weigh the running cost against gas here, since electricity runs higher for the roughly nine months a year you're heating.
When a furnace makes sense
If you're heating with gas already, or have a gas line to the house, a furnace is the straightforward choice here. It costs at least 30% less to run on natural gas than a heat pump at Idaho prices, and it doesn't lose output when winter nights drop to 21°F. It won't cool your home in summer, so you'd need a separate air conditioner for that.
Heat pump
- Runs on
- Electricity
- What it does
- Heats and cools
- Tax credit
- No federal tax credit since the end of 2025
Sources: U.S. Department of Energy · Internal Revenue Code
Furnace
- Runs on
- Natural gas
- What it does
- Heats only
- Tax credit
- No federal tax credit since the end of 2025
Sources: U.S. Department of Energy · Internal Revenue Code
Furnace wins in Twin Falls County.
Gas heat costs at least 30% less than a heat pump here, and most homes in the county already heat with gas.
If your home has no gas line, a cold-climate heat pump will still heat it through those 21°F nights and cool it come summer.
Find a contractor| Compared on | Heat pump | Furnace |
|---|---|---|
| Cost to run here | Costs more to run | At least 30% less to run |
| What it does | Heats and cools | Heats only |
| Homes in the Mountain West that heat with one | 9.1% | 69.6% |
| Handles a 21°F night | Standard models lose heating power in the cold; cold-climate models are built for it | Yes |
Sources: U.S. Energy Information Administration, U.S. Department of Energy, NOAA
When a heat pump makes sense
If your home already has gas heat but you want air conditioning too, a cold-climate heat pump is worth a look. It's built to keep making heat when standard models start to struggle in the cold, and it covers your cooling in the same unit. You'll still want to weigh the running cost against gas here, since electricity runs higher for the roughly nine months a year you're heating.
When a furnace makes sense
If you're heating with gas already, or have a gas line to the house, a furnace is the straightforward choice here. It costs at least 30% less to run on natural gas than a heat pump at Idaho prices, and it doesn't lose output when winter nights drop to 21°F. It won't cool your home in summer, so you'd need a separate air conditioner for that.
A Twin Falls County contractor will price both against your own house, your ductwork and your panel.
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