Is a heat pump, gas furnace, or dual-fuel system right for my home?
The right system depends on your home—not just your city or the equipment you already have.
An all-electric heat pump provides heating and cooling without burning gas for space heating. A gas furnace provides heat and needs a separate air conditioner if you want central cooling. A dual-fuel system combines a heat pump with a compatible gas furnace, using controls to select the heating source.
For homeowners in Walnut Creek, Concord, Pleasant Hill, Danville, and elsewhere in Contra Costa County, the useful comparison starts with heating and cooling needs, equipment condition, ductwork, electrical capacity, energy rates, and long-term goals. No option is automatically the cheapest or best for every home.
How the three options compare
| Option | What it provides | What to evaluate |
|---|---|---|
| All-electric heat pump | Heating and cooling through a compatible indoor and outdoor system | Heating capacity in cold weather, duct or ductless design, electrical requirements, controls, and any proposed supplemental heat |
| Gas furnace with separate AC | Gas heating, plus cooling from a separate air conditioner | Furnace condition and efficiency, combustion and venting safety, AC condition, and applicable installation requirements |
| Dual fuel | Heat-pump heating and cooling, with a compatible gas furnace as another heating source | Equipment compatibility, furnace condition, control strategy, installation scope, and maintenance of both heating technologies |
“All-electric” here describes the heating and cooling system. Replacing a furnace with a heat pump does not eliminate gas use or gas-service charges if other appliances still use gas.
When an all-electric heat pump deserves a close look
An all-electric system is worth evaluating when you want heating and cooling without a gas furnace, particularly when both your existing furnace and air conditioner are due for replacement.
The important question is whether the proposed equipment can meet your home’s heating needs at the outdoor conditions used to design the system. A seasonal efficiency rating alone does not answer that question. Ask for the home’s calculated heating load and the selected equipment’s heating capacity at the relevant outdoor temperature.
Also clarify whether supplemental electric resistance heat is included, when it would operate, and how it affects electrical requirements and operating costs. Supplemental heat is not the same thing as gas-furnace backup.
Modern heat pumps can operate in cold weather, but capabilities vary by model and system design. A cold night does not, by itself, prove that a Contra Costa home needs dual fuel.
Learn more about heat-pump installation and replacement.
When keeping or replacing a gas furnace may make sense
If your main concern is a heating problem, begin with a diagnosis rather than assuming the entire system needs replacement.
A working furnace may be worth retaining when its condition, safety, compatibility, and expected repair needs support that choice. If your air conditioner is also working well, compare a targeted repair with the complete scope of an equipment change.
If the furnace needs replacement, compare a furnace-based proposal with an all-electric option using the same comfort requirements. Include any cooling work you actually need; a furnace-only price is not equivalent to a proposal that replaces both heating and cooling.
Gas equipment requires appropriate combustion safety checks, venting, and maintenance. Equipment selection must also satisfy the requirements applicable to the property and installation date.
Explore furnace installation and replacement, or request a diagnosis through furnace repair.
When dual fuel may be a practical choice
Dual fuel deserves consideration when you want heat-pump heating and cooling while retaining a useful, compatible gas furnace—or when a documented design comparison supports installing both.
One opportunity is replacing an older air conditioner while keeping a furnace that remains suitable for service. However, a working furnace is not automatically compatible with any heat pump.
Before recommending a retrofit, the assessment should address:
- Furnace condition, safety, blower capability, and suitability for continued use.
- Compatible outdoor equipment, indoor coil or approved interface, and controls.
- Required airflow and the condition of supply ducts and return-air paths.
- Electrical, refrigerant-line, drainage, space, and installation requirements.
- How the system will select between electric and gas heat.
Retaining a furnace does not automatically avoid electrical work, and adding a heat pump does not guarantee a particular extension of the furnace’s life.
Dual fuel also retains gas equipment and its maintenance responsibilities. It is not an all-electric heating system.
Will a heat pump or dual-fuel system lower my bills?
Possibly—but efficiency and operating cost are different questions.
A heat pump moves heat using electricity; a gas furnace produces heat through combustion. The cost of delivering that heat depends on equipment performance, electricity and gas prices, weather, thermostat settings, and the home’s heating demand.
A useful comparison should use your actual rate plan and recent bills, with the assumptions explained. For customers served by MCE, electricity costs include generation and PG&E delivery components; looking only at a generation price would give an incomplete comparison.
Ask for installation cost and projected operating cost separately. Any projection should identify the rates, usage assumptions, equipment performance, and limitations behind it. A general percentage-savings claim or guaranteed payback is not a substitute for that calculation.
How does a dual-fuel system decide which heater to use?
Compatible controls can switch between the heat pump and furnace according to their configuration. There is no single correct switching temperature for every home.
Two different considerations matter:
- Heating capacity: Can the heat pump meet the home’s heating demand at that outdoor temperature?
- Operating cost: Under the assumed energy rates and equipment performance, which heating source costs less to run?
Those considerations may lead to different switching choices. A thermostat that changes heat sources at a preset temperature does not necessarily track changing utility prices or select the lowest-cost option every hour.
Before installation is complete, ask for an explanation of the selected controls, switching settings, and what happens during defrost or when the system cannot reach the requested temperature.
Does gas backup keep the heat on during a power outage?
Not by itself. Modern central gas furnaces require electricity for components such as the blower and controls. A dual-fuel system therefore should not be presented as a power-outage heating solution.
If outage heating is a priority, discuss it as a separate requirement. Any backup-power arrangement needs an appropriate equipment and electrical assessment.
What should Contra Costa homeowners check before choosing?
Start with the property’s actual conditions:
- A heating and cooling load calculation—not simply the size of the old equipment.
- Duct sizing, leakage, insulation, return airflow, and rooms with comfort problems.
- Electrical capacity, available circuits, and the requirements of the selected equipment.
- Outdoor-unit location, clearances, sound considerations, and any HOA restrictions.
- Permit, energy-code, inspection, and verification requirements applicable to the address and project.
A larger unit will not necessarily correct a duct restriction, and choosing dual fuel will not automatically solve an electrical-capacity constraint. Identify the cause of existing comfort problems before selecting replacement equipment.
See our ductwork repair and replacement services if airflow or duct condition is part of the concern.
What about future gas-furnace requirements?
As checked on October 26, 2026, the Bay Area Air District’s published timeline lists January 1, 2029 for its furnace zero-NOx standard, with applicability details that must be checked for the equipment and installation. The rules do not require immediate removal of an existing working furnace.
Do not assume that including gas backup makes a future dual-fuel installation exempt. Confirm the rules in effect when planning the project, along with the requirements of the local permitting authority.
Request a comparison for your home
Considering an all-electric heat pump, furnace replacement, or dual-fuel system? Contact Galaxy Heating & Air Conditioning or call (925) 578-3293 to request an assessment and estimate.
Tell us which equipment you have, what is working or failing, whether you need cooling, and whether retaining gas heat is important to you. Ask the proposal to identify what stays, what changes, the equipment and controls recommended, and any required duct, electrical, or permit work.
The goal is a system choice supported by your home’s needs and a clear installation scope—not a one-size-fits-all recommendation.