Choosing between a gas furnace and an electric furnace comes down to a trade-off: one usually costs more to install, and the other usually costs more to run. In Houston, TX, where winters are short but hard freezes still happen, the right answer depends on your home, your utility rates, and whether you already have natural gas service.

This guide compares gas and electric furnaces on installation cost, operating cost, efficiency, maintenance, lifespan, and safety, and shows you how to estimate running costs using your own utility rates. It also covers the option many homeowners overlook: a heat pump. For service, see our gas furnace services and electric furnace services.

Quick Answer: Gas or Electric Furnace?

Electric furnaces usually cost less to install, need less maintenance, and have no combustion safety concerns. Gas furnaces usually cost less to run, because natural gas is typically cheaper per unit of heat than electricity, and they deliver hotter air during hard freezes. If your home already has gas service, a gas furnace is often the lower cost choice over time. If your home is all-electric, a heat pump is usually a better investment than an electric furnace.

Gas vs. Electric Furnace at a Glance

	Gas Furnace	Electric Furnace
Installation cost	Higher, especially if a gas line or new venting is needed	Lower
Cost to run	Usually lower	Usually higher
Efficiency at the unit	About 80% to 98% AFUE	Nearly 100%
Heat at the vents	Very warm air	Warm air, heats more gradually
Maintenance	More, including combustion safety checks	Less
Typical lifespan	About 15 to 20 years	Often 20 years or more
Venting	Required	None
Carbon monoxide risk	Yes, needs detectors and inspection	No combustion at the unit
Works in a power outage	No	No

1. Installation Costs

Gas furnaces

Gas furnaces usually cost more to install. They need a gas supply, proper venting, and combustion safety setup. The gap is biggest when a home does not already have gas service or needs new venting. If you are replacing an existing gas furnace with a similar one, the extra cost is much smaller.

High-efficiency condensing furnaces cost more than standard 80% models, and they need PVC venting and a condensate drain.

Electric furnaces

Electric furnaces are usually less expensive to install. There is no gas line and no flue. The main requirement is enough electrical capacity. Larger electric furnaces need large breakers and heavy wiring, and older homes may need panel upgrades. See how to choose an electric furnace.

Installed prices depend on size, efficiency, brand, and your home’s setup, so the only accurate number comes from an in-home estimate. Schedule an estimate to compare both.

2. Operating Costs

This is where the two differ most. An electric furnace turns nearly all of its electricity into heat, but electricity usually costs more per unit of heat than natural gas. So even at close to 100% efficiency, electric heat is often more expensive to run.

How to compare using your own rates

Both fuels can be compared by what it costs to deliver the same amount of heat, 100,000 BTU (one therm):

•             Gas furnace: your gas price per therm ÷ furnace AFUE
•             Electric furnace: your electricity price per kWh × 29.3
•             Heat pump: the electric furnace cost ÷ the heat pump’s efficiency factor (often around 2 to 3 in mild weather)

Example only

System	Example Rate	Cost per 100,000 BTU of Heat
Gas furnace, 95% AFUE	$1.20 per therm	About $1.26
Electric furnace	$0.15 per kWh	About $4.40
Heat pump (efficiency factor of 2.5)	$0.15 per kWh	About $1.76

These numbers are examples to show the method, not current Houston rates. Check your gas and electric bills for your actual prices.

Why the gap is smaller in Houston

Houston’s heating season is short. Even if electric heat costs more per hour, you run it far fewer hours than homeowners in colder states. That is why many Houston homes use electric heat strips and still keep winter bills manageable, until a hard freeze keeps the heat running for days.

See how heating and cooling affect your bill in is air conditioning part of your electric bill?

3. Energy Efficiency

Gas furnaces

Standard gas furnaces are about 80% AFUE. Condensing models reach about 90% to 98% by capturing extra heat from the exhaust. The remaining energy is lost through venting. Learn more in the most efficient gas furnaces.

Electric furnaces

Electric furnaces convert nearly 100% of their electricity into heat at the unit. But that does not make them cheaper to run, because of the higher cost of electricity per unit of heat.

Heat pumps

Heat pumps move heat instead of creating it, so they can deliver more heat than the electricity they use. According to the U.S. Department of Energy, heat pumps can cut the electricity used for heating by about half compared with electric resistance heating like furnaces and baseboard heaters.

4. Maintenance and Lifespan

Gas furnaces

Gas furnaces need more maintenance. An annual inspection should check the heat exchanger, burners, flame sensor, venting, gas pressure, and carbon monoxide levels. With good care, many last around 15 to 20 years.

Electric furnaces

Electric furnaces are simpler, with no burners, flue, or combustion. Maintenance focuses on heating elements, sequencers, electrical connections, and the blower. Because they have fewer parts under combustion stress, many electric furnaces last 20 years or more.

Both benefit from a yearly tune-up. See our HVAC maintenance service.

5. Safety

•             Gas furnaces: burn fuel indoors and must vent exhaust safely. Every home with a gas furnace should have working carbon monoxide detectors and an annual inspection. Warning signs include a yellow flame, soot, or a CO alarm. Learn more in gas furnaces explained.
•             Electric furnaces: no combustion and no carbon monoxide from the unit. The main risks are electrical, which is why internal repairs should be left to a licensed technician. See how electric furnaces work.

If you smell gas or a CO alarm sounds, leave the home and call 911 or your gas utility from outside.

6. Comfort

Gas furnaces produce noticeably hotter air at the vents and recover quickly during a cold snap. Electric furnaces heat more gradually, and the air can feel less hot, though the home still reaches the set temperature. Neither will run without power, since both need electricity for the blower and controls.

7. Environmental Impact

Gas furnaces release carbon dioxide at the home. Electric furnaces produce no emissions at the point of use, but their overall impact depends on how your electricity is generated. A heat pump uses less electricity for the same heat, which generally lowers its overall impact.

Don’t Forget the Heat Pump

For many Houston homes, the real choice is not gas vs. electric furnace. It is gas furnace vs. heat pump.

•             Choose a gas furnace if your home already has gas service, gas rates are low, and you want strong heat during hard freezes.
•             Choose a heat pump if your home is all-electric or you are replacing your AC at the same time.
•             Choose an electric furnace if upfront budget is the main concern and you use heat only occasionally.
•             Choose a dual-fuel system if you have gas and want the lowest running cost: a heat pump on mild days and a gas furnace when it gets very cold.

Read more in heat pump pros and cons and home heating system types.

Which Is Better for Your Houston Home?

Your Situation	Often the Best Fit
Home has natural gas and an aging gas furnace	New gas furnace or dual-fuel system
All-electric home replacing AC and heat	Heat pump
Tight upfront budget, occasional heating	Electric furnace or heat strips
Want strongest heat in hard freezes	Gas furnace or dual-fuel
Want no combustion appliances in the home	Heat pump or electric furnace

Frequently Asked Questions

Is a gas furnace cheaper to run than an electric furnace?

Usually yes, because natural gas typically costs less per unit of heat than electricity. Check your own rates using the method above.

Which lasts longer, gas or electric?

Electric furnaces often last 20 years or more because they have no combustion wear. Gas furnaces typically last around 15 to 20 years with maintenance.

Is an electric furnace safer than a gas furnace?

Electric furnaces have no combustion, so there is no carbon monoxide from the unit. Gas furnaces are safe when properly installed and inspected, with working CO detectors in the home.

Can I switch from electric to gas?

Yes, if natural gas service is available. It requires a gas line, venting, and permits, which adds cost. A heat pump is often a simpler upgrade for all-electric homes.

Is a heat pump better than both?

In mild climates like Houston, a heat pump is often the most efficient all-electric option. Gas furnaces still perform better during hard freezes.

Do either work during a power outage?

No. Both need electricity for the blower and controls.

Get Honest Advice on Your Heating System

Not sure whether gas, electric, or a heat pump makes the most sense for your home? KAC Express will look at your home, your current setup, and your utility costs, then give you clear options with pricing in writing. We repair, maintain, and install all three across the Houston area.

Learn more about heating installation and heating repair, or read how furnace installation is done.

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