Why Your Heating Bill Spikes in Winter (And What You Can Do)

Oklahoma Weather and Your Wallet

Central Oklahoma doesn't do gradual season changes. We'll have a 65-degree Tuesday followed by a 20-degree Thursday, and your HVAC system has to respond to every swing. That kind of volatility hits your energy bill harder than a steady cold winter would.

Here's why: your heating system works hardest when the gap between the outdoor temperature and your thermostat setting is largest. A stretch of days in the teens and twenties — which we get several times each winter in the Norman, Moore, and Purcell area — means your system is running almost continuously. That's normal. It's also expensive.

The biggest bill shock usually comes in January or February, when we get sustained cold snaps or ice storms that keep temperatures below freezing for days at a time.

How Auxiliary and Emergency Heat Drive Up Costs

If you have a heat pump, this is the single biggest factor in your winter bill. Heat pumps are efficient down to about 30-35 degrees because they're moving heat from outside air into your home. Below that point, there isn't enough heat in the outdoor air to keep up, and the system kicks on auxiliary heat — which is essentially electric resistance heating.

Auxiliary heat uses roughly three times more electricity than the heat pump alone. During a week-long cold snap, your heat pump might run auxiliary heat for 12-16 hours a day. That one week can account for a third of your monthly bill.

Emergency heat is even worse — it bypasses the heat pump entirely and runs only on electric resistance strips. If your thermostat is set to emergency heat and you forgot to switch it back, you're paying top dollar for every minute of runtime.

Check your thermostat. If it says "EM HEAT" or "Emergency," switch it back to normal heating mode unless a technician told you otherwise.
If auxiliary heat runs constantly even on moderate days (above 40 degrees), your heat pump may need service.

Gas vs. Electric Heating Costs

In Central Oklahoma, natural gas is generally cheaper per unit of heat than electric resistance heating. A gas furnace running at 95% efficiency will cost less to operate than electric strip heat in most months.

However, a heat pump operating in its efficient range (above 30-35 degrees) actually beats gas on operating cost. This is why dual-fuel systems — a heat pump paired with a gas furnace for backup — can give you the lowest total heating costs in our climate.

If you're seeing unusually high gas bills, check that your furnace is cycling normally and not short-cycling (turning on and off rapidly), which wastes fuel.

Thermostat Strategies That Actually Work

Set it and leave it — With a heat pump, large temperature setbacks can backfire. If you drop the thermostat to 62 at night and bump it to 70 in the morning, the system may kick on auxiliary heat to recover, costing more than if you'd just held 68 all night.
Modest setbacks only — A 2-3 degree setback overnight is fine. More than that with a heat pump often triggers the aux heat you're trying to avoid.
Use a smart thermostat — Ecobee and Honeywell models designed for heat pumps manage setback recovery intelligently, bringing the temperature up gradually to avoid auxiliary heat.
If you have a gas furnace, you have more flexibility. A 5-8 degree setback overnight can save 5-10% on heating costs.

Insulation and Air Sealing

No thermostat strategy compensates for a poorly insulated home. In Central Oklahoma, the most common issues we see are:

Insufficient attic insulation — Many homes in the Norman and Moore area built before 2000 have R-19 or less in the attic. Current code calls for R-38 to R-49. Adding blown-in insulation is one of the highest-return upgrades you can make.
Leaky ductwork in the attic — If your ducts run through an unconditioned attic (most Oklahoma homes), leaks mean you're literally heating the attic. Duct sealing can improve efficiency 20-30%.
Air leaks around doors, windows, and penetrations — Weatherstripping and caulk are cheap. A blower door test can identify exactly where your home is losing heat.

When a High Bill Means Something Is Wrong

Some high bills are just the result of cold weather. But certain signs point to an actual problem:

Bill is significantly higher than the same month last year with similar weather — something changed.
System runs constantly even when outdoor temps are above 40 degrees.
Rooms are unevenly heated — some hot, some cold — which can indicate duct problems or a zoning issue.
You hear the system cycling on and off rapidly (every few minutes) — short-cycling wastes energy and wears out components.
Your system is 12-15+ years old and bills have crept up over several seasons — efficiency degrades with age.

If any of these apply, it's worth getting a professional evaluation before the coldest months hit. Call Trinity Climate Control or visit our contact page to schedule a heating system checkup. We'll tell you honestly whether the bill is just Oklahoma winter doing its thing or whether your system needs attention.