Heat pump vs Furnace in Lewis and Clark County, Montana
When a heat pump makes sense
A heat pump makes sense if you want air conditioning and heat from one system and you already have a backup plan for the coldest nights. Standard heat pumps lose heating power as the temperature drops, and winter nights here average 15°F from December through February. A cold-climate model is built to keep working at those temperatures, so it holds up better than a standard one on the nights that matter most.
When a furnace makes sense
A furnace is the right call for most homes here. Winter nights average 15°F from December through February, and homes need heat for about 10 months of the year, so a system that holds its output no matter how cold it gets outside is worth having. Natural gas also runs at least 40% cheaper than a heat pump at Montana prices. It won't cool your home in summer, so that would need a separate system.
When a heat pump makes sense
A heat pump makes sense if you want air conditioning and heat from one system and you already have a backup plan for the coldest nights. Standard heat pumps lose heating power as the temperature drops, and winter nights here average 15°F from December through February. A cold-climate model is built to keep working at those temperatures, so it holds up better than a standard one on the nights that matter most.
When a furnace makes sense
A furnace is the right call for most homes here. Winter nights average 15°F from December through February, and homes need heat for about 10 months of the year, so a system that holds its output no matter how cold it gets outside is worth having. Natural gas also runs at least 40% cheaper than a heat pump at Montana prices. It won't cool your home in summer, so that would need a separate system.
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 Lewis and Clark County.
Winter nights here average 15°F, and gas heat costs at least 40% less than a heat pump at Montana prices, so the furnace wins.
If your home has no gas line, a cold-climate heat pump will still heat it through those 15°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 40% 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 15°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
A heat pump makes sense if you want air conditioning and heat from one system and you already have a backup plan for the coldest nights. Standard heat pumps lose heating power as the temperature drops, and winter nights here average 15°F from December through February. A cold-climate model is built to keep working at those temperatures, so it holds up better than a standard one on the nights that matter most.
When a furnace makes sense
A furnace is the right call for most homes here. Winter nights average 15°F from December through February, and homes need heat for about 10 months of the year, so a system that holds its output no matter how cold it gets outside is worth having. Natural gas also runs at least 40% cheaper than a heat pump at Montana prices. It won't cool your home in summer, so that would need a separate system.
A Lewis and Clark County contractor will price both against your own house, your ductwork and your panel.
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