They produce heat differently
A furnace creates heat by burning fuel or using electric resistance. A heat pump moves heat from outdoors to indoors and reverses to provide cooling. That difference affects efficiency, supply-air temperature, electrical demand, maintenance, and the way a system performs as outdoor temperature changes.
The better choice is site-specific. Climate, utility prices, existing equipment, ductwork, electrical capacity, comfort goals, and the selected model all matter.
Compare capacity, not just efficiency
Heat-pump heating capacity and efficiency vary with outdoor temperature. Review certified capacity and coefficient of performance near your local winter design temperature. Then compare those values with the home's calculated heating load.
A furnace is commonly described by input and output capacity. Oversizing either technology can reduce comfort. A room-by-room load calculation is the common starting point for both.
Operating cost depends on local energy prices
There is no universal winner on annual cost. Compare the delivered cost of heat using your electricity and fuel rates, expected seasonal efficiency, climate, and backup-energy strategy. Include cooling: a heat pump can replace both a furnace and central air conditioner, which changes the capital-cost comparison.
- Use recent utility bills and current marginal energy rates.
- Model more than one winter condition instead of one rated point.
- Include fixed fuel charges that may remain after partial electrification.
- Consider a dual-fuel design only with a clear control strategy.
Comfort and home readiness
Heat pumps often run for longer cycles with lower supply-air temperatures than furnaces. Proper airflow and weatherization can improve comfort. Before replacing equipment, inspect duct leakage, insulation, air sealing, filtration, and electrical capacity. Fixing those constraints may reduce the equipment size the home needs.