Heat pump vs Furnace in Kauai County, Hawaii
When a heat pump makes sense
This is the right call for almost any home here. Winter nights average 62°F from December through February, well within what a standard heat pump handles without trouble, and it costs about 15% less to run than gas at Hawaii prices. It also cools your home the rest of the year, which a furnace never will.
When a furnace makes sense
A furnace only makes sense if your home already has a gas line in place and you have a reason to stick with it. It cannot cool your home, so you would still need something else for the rest of the year, and only 3% of homes here heat with gas at all. For most homes on Kauai, there is little reason to choose one new.
When a heat pump makes sense
This is the right call for almost any home here. Winter nights average 62°F from December through February, well within what a standard heat pump handles without trouble, and it costs about 15% less to run than gas at Hawaii prices. It also cools your home the rest of the year, which a furnace never will.
When a furnace makes sense
A furnace only makes sense if your home already has a gas line in place and you have a reason to stick with it. It cannot cool your home, so you would still need something else for the rest of the year, and only 3% of homes here heat with gas at all. For most homes on Kauai, there is little reason to choose one new.
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
Heat pump wins in Kauai County.
Nights here only drop to about 62°F, so a heat pump keeps up easily, and it costs less to run than gas heat.
If your home already has a gas line and you have no need for cooling, a furnace still makes sense.
Find a contractor| Compared on | Heat pump | Furnace |
|---|---|---|
| Cost to run here | About 15% less to run | Costs more to run |
| What it does | Heats and cools | Heats only |
| Homes in the Pacific states that heat with one | 4.8% | 56.9% |
| Handles a 62°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
This is the right call for almost any home here. Winter nights average 62°F from December through February, well within what a standard heat pump handles without trouble, and it costs about 15% less to run than gas at Hawaii prices. It also cools your home the rest of the year, which a furnace never will.
When a furnace makes sense
A furnace only makes sense if your home already has a gas line in place and you have a reason to stick with it. It cannot cool your home, so you would still need something else for the rest of the year, and only 3% of homes here heat with gas at all. For most homes on Kauai, there is little reason to choose one new.
A Kauai County contractor will price both against your own house, your ductwork and your panel.
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