Smallest Gas Furnaces (US market) – GreenBuildingAdvisor

I’m looking for infohelp on options for gas furnaces with a low-fire rate below the 24K BTU input that has been the lowest available at supply houses for years now.

With the existing housing stock becoming tighter and better insulated, the existing gas furnaces available on the US market are just too darn big.

The struggle is real out there, with many homeowners who wish to stick with gas forced air heat — even when their state legislators and utilities are pushing hard for heat pumps.

In my experience, the typical installed cost of an inverter-driven heat pump is roughly 2x’s the cost of a gas furnace paired with an evaporator coil and condenser. The cost premium alone keeps most folks I work for from even considering the upgrade to a high-performance heat pump only system.

Any suggestions on gas furnaces available on the US market for low load (18K BTU/hr or less) existing houses?