Heat Pump vs. Furnace and Air Conditioner

How each system actually heats your home

A gas furnace burns natural gas to heat air directly, then a blower distributes it through the ductwork. A heat pump doesn't generate heat by combustion — it moves heat from outside air into the home in winter and reverses the process to cool in summer. Whether a given heat pump keeps up depends on comparing its published heating capacity at outdoor design conditions against the home's calculated heating load, not on general assumptions about the climate. Read more about local conditions in our Morgan Hill HVAC climate page.

Running-cost logic, without invented numbers

Whether a heat pump or a gas system costs less to run depends on the relative price of electricity and gas under your PG&E rate plan, the efficiency ratings of the specific equipment, and how well the system is sized and installed. Comparing the proposed heat pump's efficiency rating and your rate plan against your existing furnace's efficiency and your gas rate is what determines the outcome for your home. Because these variables are household-specific, we won't quote dollar figures here — a contractor can walk through your actual usage and rate plan, and our heat pump cost overview explains what factors into the installed price itself.

Will a heat pump lower your PG&E bill?

There is no universal yes or no. Whether a heat pump costs less to run than your current furnace depends on your actual electricity rate plan, your gas rate and usage, the proposed heat pump's efficiency (COP) and part-load performance, the AFUE and condition of your existing furnace, thermostat habits, your home's heating load, duct performance, and the backup heat strategy chosen. Two households on the same street can land on opposite answers.

Solar can change the economics of purchased electricity, but it does not automatically make heat-pump heating free. Your system's production timing, your annual surplus, whether you have battery storage, your rate and net-billing setup, and when heating energy is actually consumed all shape the real outcome — much of winter heating demand falls outside peak solar hours.

As of September 15, 2026, Silicon Valley Clean Energy's Full-Service program publishes an estimated average first-year energy savings range of $300–$500 for heat-pump space heating and cooling, specifically when replacing existing gas equipment and switching to an electrification-friendly rate plan. Treat that as SVCE's program estimate, not a guaranteed saving for any individual Morgan Hill household.

What you can do at the estimate: have a year of PG&E bills on hand and ask each bidder to model the proposed heat pump against your current furnace on the rate plan you would actually be on, rather than a generic national assumption.

Comfort characteristics

Furnaces deliver heat in stronger bursts, cycling on and off. Variable-capacity heat pumps can modulate and run longer at lower output, but comfort, sound, moisture removal, and efficiency depend on design, sizing, controls, ducts, installation, and operating conditions rather than the equipment label. For cooling, both approaches rely on similar refrigerant-based air conditioning. See single-stage vs. two-stage vs. variable-speed equipment for how staging affects comfort regardless of which path you choose.

Equipment footprint and installation differences

A furnace-plus-AC split system uses an indoor furnace/blower with an evaporator coil and an outdoor condenser. A heat pump uses an outdoor heat-pump unit with an indoor air handler, or it can pair with a compatible furnace in a dual-fuel setup. For a home without gas service, or where removing a gas appliance is a goal, the heat pump path may involve fewer gas-related elements, but dimensions, clearances, drainage, electrical, and service access still need to be verified for the specific home.

Ductwork and airflow needs

Neither system solves a duct problem on its own. Undersized returns, leaky supply runs, or panned joist returns can limit performance whether you install a furnace, an AC, or a heat pump. Airflow and static pressure should be measured and compared against the selected equipment's requirements before a conversion. Our page on whether you need new ductwork covers what to look for.

Electrical requirements

Furnaces need only a modest electrical circuit for the blower and controls. Heat pumps may require a dedicated circuit sized for the outdoor unit and, if used, backup electric resistance heat. A conversion does not automatically require a panel upgrade; whether it does depends on the existing service and load, the equipment's electrical requirements, and code as evaluated for your project. See our dedicated page on whether a heat pump requires a panel upgrade.

Dual fuel as a middle path

Some households choose a dual fuel setup: a heat pump paired with the existing gas furnace, with controls set to switch between the two at an outdoor-temperature threshold and system performance criteria determined for the specific equipment and home. This can appeal to homeowners who want to reduce gas use without giving up the furnace entirely, though it means maintaining two heating sources rather than one, and the changeover behavior should be set as part of the project's design rather than assumed.

Incentives and maintenance

Heat pump projects in Morgan Hill may qualify for current Silicon Valley Clean Energy incentives; see our page on heat pump rebates available to Morgan Hill homeowners for the current amounts and eligibility. On maintenance, both system types benefit from regular filter changes and seasonal service, though a heat pump that runs in both heating and cooling mode may see more total operating hours annually than a furnace that only runs part of the year.