Furnace vs Boiler in Bullitt County, Kentucky
When a furnace makes sense
If your home already has ductwork, a furnace is the simpler path, and it can heat that air quickly once it kicks on. On a 28°F night that matters, since you're not waiting on water to warm up first. Those same ducts can carry air conditioning in summer, which a boiler has no way to do.
When a boiler makes sense
If your home already has radiators or in-floor piping, a boiler is worth keeping rather than ripping out for ductwork. It runs about 5% cheaper than a furnace at Kentucky gas prices, and with about 7 months of heating season here, that gap adds up. Boiler heat also doesn't cycle on and off the way forced air does, so a room stays evenly warm through the night.
When a furnace makes sense
If your home already has ductwork, a furnace is the simpler path, and it can heat that air quickly once it kicks on. On a 28°F night that matters, since you're not waiting on water to warm up first. Those same ducts can carry air conditioning in summer, which a boiler has no way to do.
When a boiler makes sense
If your home already has radiators or in-floor piping, a boiler is worth keeping rather than ripping out for ductwork. It runs about 5% cheaper than a furnace at Kentucky gas prices, and with about 7 months of heating season here, that gap adds up. Boiler heat also doesn't cycle on and off the way forced air does, so a room stays evenly warm through the night.
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
Boiler
- 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 Bullitt County.
Most houses here were built in 1993, and homes that age already have the ductwork a furnace needs, so it's the cheaper install.
If your home already has radiators or in-floor piping instead of ductwork, a boiler is still the better fit.
Find a contractor| Compared on | Furnace | Boiler |
|---|---|---|
| Cost to run here | Costs more to run | About 5% less to run |
| What it does | Heats only | Heats only |
| Handles a 28°F night | Yes | Yes |
Sources: U.S. Energy Information Administration, U.S. Department of Energy, NOAA
When a furnace makes sense
If your home already has ductwork, a furnace is the simpler path, and it can heat that air quickly once it kicks on. On a 28°F night that matters, since you're not waiting on water to warm up first. Those same ducts can carry air conditioning in summer, which a boiler has no way to do.
When a boiler makes sense
If your home already has radiators or in-floor piping, a boiler is worth keeping rather than ripping out for ductwork. It runs about 5% cheaper than a furnace at Kentucky gas prices, and with about 7 months of heating season here, that gap adds up. Boiler heat also doesn't cycle on and off the way forced air does, so a room stays evenly warm through the night.
A Bullitt County contractor will price both against your own house, your ductwork and your panel.
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