How the two paths differ
Heat-pump-only uses the heat pump for cooling and all heating (sometimes with electric resistance backup). Dual-fuel uses the heat pump most of the year, then switches to a gas furnace in deeper cold.
Side by side
| Factor | Heat-pump-only | Dual-fuel |
|---|---|---|
| Heating fuel | Electric | Electric + gas backup |
| Deep-cold strategy | Cold-climate HP (+ strip heat if needed) | Automatic furnace takeover |
| Gas line needed? | No | Yes (or propane setup) |
| System pieces | Fewer combustion parts | Heat pump + furnace to maintain |
| Incentive potential | Often strong for HP upgrades | Often applies to HP portion |
| Best for | All-electric goals, no gas, simpler plant | Gas available + cold-snap comfort margin |
St. Louis winter reality
We get humid summers and real cold snaps. Heat-pump-only can be an excellent fit with the right cold-climate equipment and a tight home. Dual-fuel appeals when you want furnace-style heat on the coldest nights without giving up heat-pump efficiency the rest of the year. Also see heat pump vs. furnace if you're still choosing the broader fuel story.
When heat-pump-only makes sense
- No gas service (or you want to leave combustion behind).
- You're prioritizing a simpler mechanical system.
- Your home and equipment selection support cold-weather capacity.
When dual-fuel makes sense
- Natural gas is available and you like furnace heat in deep cold.
- You want automatic changeover instead of relying on strip heat alone.
- An existing healthy furnace can be paired with a new heat pump.
The bottom line
Neither path is “the only right answer” for Missouri. We'll compare heat pump and furnace combinations for your ducts, utility situation, and comfort goals, and offer a free second opinion if another company already pushed one side.