The heat pump vs. gas furnace question is coming up constantly now, driven by energy efficiency incentives and climate conversations. Here is how we actually think about it for NJ homeowners.
How heat pumps work in cold climates
A heat pump does not generate heat. It moves it. Even at 20 degrees Fahrenheit, there is heat energy in outdoor air that the system can extract and transfer indoors. Modern cold-climate heat pumps (sometimes called inverter-driven or variable-speed heat pumps) maintain full capacity down to 0-5 degrees F. This is a significant improvement over units from 10 years ago that struggled below 30 degrees.
The efficiency argument
A high-efficiency gas furnace operates at roughly 96-98% AFUE, so nearly all fuel energy becomes heat. A heat pump delivers 200-300% efficiency (moving 2-3 BTUs of heat for every BTU of electricity used). At current NJ gas and electricity rates, the operating cost differential depends heavily on your utility. If your gas rates are low and your electricity cost is standard, the gap narrows. If you are on electric resistance heat today, switching to a heat pump cuts heating costs significantly.
Where gas furnaces still win
For whole-house heating in an older NJ home with existing ductwork, a 96% AFUE gas furnace is hard to beat on upfront cost and simplicity. Installed price depends on the unit and the house. It works at any temperature. It heats the house fast after a setback.
For current price ranges, see our furnace replacement cost guide.
The dual-fuel option
The most practical choice for many NJ homes: a heat pump as the primary heating source (handling 80-90% of heating hours efficiently) with a gas furnace as backup below a set "balance point" temperature. This captures most of the efficiency benefit while maintaining reliability during the coldest stretches.
Incentives change often
Federal and state incentives for heat pumps change often, and the federal efficiency tax credit that applied through 2025 has ended. Ask for current eligibility before you compare costs.