Gas Furnace vs Electric Furnace
Head-to-Head Comparison
| Criterion | Gas Furnace | Electric Furnace |
|---|---|---|
| Operating cost in most US climates | Lower — natural gas is usually cheaper per BTU than resistance electricity | Higher in cold climates where long runtimes accumulate large electric bills |
| Installation simplicity | Requires gas line, venting, and CO safety compliance | Simpler — only needs an adequate electrical circuit |
| Safety considerations | Combustion risk requires CO detection and annual flue inspection | No combustion, no carbon monoxide risk |
| Equipment lifespan | 15–20 years with proper maintenance | 20–30 years — fewer moving parts |
Decision checkpoints
Money-saving angles
Gas Furnace
Pros
- ✓ Lower monthly heating bill in most regions where gas rates are competitive
- ✓ Warmer supply air (120–140°F vs ~90–100°F electric) for faster recovery
- ✓ Readily available technician support in most markets
Cons
- ✗ Combustion creates carbon monoxide risk — requires CO detectors and annual flue inspection
- ✗ Higher installation cost when gas line work is needed
- ✗ Fuel price is volatile and subject to utility rate changes
Electric Furnace
Pros
- ✓ No combustion, no flue, no CO risk — simpler safety profile
- ✓ Lower purchase price and easier installation
- ✓ Longer average lifespan with fewer maintenance requirements
Cons
- ✗ Higher monthly operating cost in most US climates
- ✗ Supply air is cooler, which some occupants feel as 'drafty'
- ✗ Not the right choice where electric rates are high and winters are long
Our Verdict
Gas furnaces almost always win on operating cost in cold climates where heating runs long. Electric furnaces are the better choice where gas is unavailable, winters are mild, or safety simplicity outweighs fuel savings — and they become more competitive if paired with a heat pump rather than used as a standalone unit.
Related gear on Amazon.co.uk
Quick buyer-intent searches that pair well with this decision. Links open a filtered search on Amazon.co.uk.
The operating cost calculation most people skip
Gas is cheaper per BTU in most US markets today, but the gap varies enormously by region and changes with utility rates. The correct comparison is: annual heating load (BTU) ÷ furnace efficiency ÷ fuel cost per BTU. In the Pacific Northwest where electricity is cheap and hydro-heavy, the math sometimes reverses. Always use your local rate, not national averages.
Carbon monoxide is not optional to manage
Electric furnaces have zero combustion risk. Gas furnaces require an intact heat exchanger, a clear flue, and at least one CO detector on each floor. A cracked heat exchanger is the most dangerous failure mode — it has no visible sign from the thermostat perspective, and the system will keep running while leaking CO into the air stream. Annual inspections and functional CO alarms are not optional.
Electric furnaces are often overlooked as a bridge solution
If your gas furnace dies mid-winter and you plan to eventually install a heat pump, a temporary electric furnace can be a low-cost bridge. Electric furnaces are inexpensive to install and require no venting work. You avoid the pressure of choosing long-term heating equipment in an emergency.
Ready to make a decision?
Get free quotes from verified HVAC contractors who can help you choose.
Find Local Pros