Have you noticed your electric bill increasing after a cold front moves through Florida even though your air conditioner has barely been running?
You’re not imagining things. Cold weather can increase electricity use, especially when your heating system activates auxiliary electric heat. Many Florida homes use heat pumps, which can heat efficiently in mild weather but may need extra heating when temperatures drop.
The good news? Not every cold front will increase your bill. Here’s what causes unexpected winter electricity costs and how to manage them.
Does Cold Weather Increase Electric Bills in Florida?
Yes, it can. Heating systems may consume more electricity during cold weather, particularly when auxiliary heat strips activate. However, if you use less air conditioning and very little heating, your electric bill could actually decrease.
Why Does Your Electric Bill Go Up During a Florida Cold Front?
When outdoor temperatures drop, your home loses heat faster. Your heating system may run longer to maintain the temperature set on your thermostat, increasing electricity consumption.
According to FPL’s energy-saving guidance, heating can use two to three times more energy than cooling in the circumstances described by the utility. Your actual usage depends on your equipment, thermostat settings, insulation, and how long the cold spell lasts.
One of the biggest factors is auxiliary heat, often displayed as “AUX HEAT” on a thermostat.
What Is AUX HEAT, and Why Can It Make Your Electric Bill So High?
Many Florida homes use heat pumps, which transfer heat from outdoor air into the home. When temperatures fall or the system needs additional heating capacity, some heat pumps activate electric resistance heat strips.
These strips generate heat directly using electricity and generally consume more electricity per unit of heat delivered than a properly operating heat pump.
If auxiliary heat runs for extended periods, your electricity usage can increase significantly. FPL has cited additional heating costs of up to $15 per day in specific circumstances involving extended heat-strip operation. This is not a typical daily cost for every Florida home.
What does AUX HEAT mean on your thermostat?
AUX HEAT usually means supplemental heating is operating. Occasional use can be normal, particularly during a cold snap or when your system is recovering from a large temperature setback.
AUX HEAT is different from EMERGENCY HEAT.
Auxiliary heat typically activates automatically when needed. Emergency heat is generally a manually selected backup mode used when the heat pump cannot operate properly. Follow your equipment’s instructions if you’re unsure which mode to use.
If auxiliary heat runs unusually long during mild weather, have a qualified HVAC technician check your system. Don’t disable necessary backup heating without professional guidance.
For more details, see the U.S. Department of Energy’s heat pump guide.
Can Cold Weather Actually Lower Your Electric Bill?
Yes. During a mild Florida cold front, your air conditioner may run less often. If you also need little heating, the reduction in cooling-related electricity use may offset the extra energy used for heating.
| What happens during a cold front? | Possible effect on your bill |
|---|---|
| Temperatures cool slightly and little heating is needed | Your bill may decrease |
| Your heat pump runs normally | Your bill may rise modestly or stay similar |
| Auxiliary heat runs for extended periods | Your bill may rise substantially |
| Portable electric heaters run for hours | Electricity usage may increase |
| Your home has drafts or poor insulation | Heating may run longer |
To understand whether the cold weather caused your higher bill, compare the kilowatt-hours (kWh) on your current bill with the same period last year. Check the number of billing days and your average daily usage, too.
Electricity rates, hot-water use, and other appliances can also affect your bill, so the weather isn’t always the only explanation.
How Much Can Electric Heating Add to Your Bill?
Even a small portable heater can add noticeable electricity use when it runs for several hours every day.
Example: A 1,500-watt electric space heater
| Calculation | Example |
|---|---|
| Heater power | 1,500 watts |
| Daily use | 8 hours |
| Electricity consumed | 12 kWh per day |
| Illustrative electricity rate | $0.15/kWh |
| Daily energy cost | $1.80 |
| Cost over 7 days | $12.60 |
The calculation is simple: 1.5 kW × 8 hours = 12 kWh per day. At an illustrative rate of $0.15 per kWh, that equals $1.80 per day or $12.60 over seven days.
This is an example, not a verified current FPL or Duke Energy rate. Actual costs depend on your utility tariff, taxes, fees, and how often the heater operates.
5 Ways to Lower Your Electric Bill During a Cold Front
- Set your thermostat carefully. FPL recommends 68°F or lower as an energy-saving heating target when comfortable and appropriate for your household. Avoid large temperature increases if they trigger auxiliary heat on your system.
- Keep warm air inside. Seal drafts around doors and windows with appropriate weatherstripping or caulk.
- Maintain your heating system. Clean or replace filters according to the manufacturer’s instructions, and keep vents clear of furniture and curtains.
- Use space heaters wisely. Heat only the occupied area when practical. Follow the manufacturer’s safety instructions, keep heaters away from bedding and other combustible materials, and never leave them unattended.
- Check your actual electricity usage. Review your utility account for daily kWh information, if available. If consumption stays unusually high after temperatures return to normal, consider an HVAC inspection.
Heat pumps can operate differently depending on their design and thermostat settings. The U.S. Department of Energy provides additional guidance on heat pump operation and efficiency.
Can Solar Help Offset Higher Electric Bills in Winter?
Solar panels can generate electricity throughout Florida’s winter months, including on cooler days when sunlight is available. Shorter days and cloudy weather can reduce production, but a properly designed system may help offset some of the electricity your household purchases throughout the year.
Solar doesn’t prevent your heating system from using more electricity during a cold front. Your actual savings depend on your energy consumption, system production, utility billing arrangement, and other factors.
That’s why evaluating solar based on your year-round electricity usage not just one unusually high winter bill is important.
Read our guide, Is Solar Still Worth It in Florida in 2026?, to learn what affects the potential costs and savings.
Frequently Asked Questions
Why is my electric bill higher when it gets cold?
Your heating system may run longer to maintain your indoor temperature. If your heat pump activates auxiliary electric heat strips, electricity consumption can rise more quickly. Drafts and portable heaters can also contribute.
What temperature should I set my thermostat to during a Florida cold front?
FPL recommends 68°F or lower as an energy-saving target when heating, provided it is comfortable and appropriate for your household. Follow your heat pump manufacturer’s guidance, especially when adjusting the thermostat.
Does a heat pump use more electricity during cold weather?
It may. A heat pump can run longer as outdoor temperatures fall, and some systems activate auxiliary electric heat when additional heating is needed. Actual consumption depends on the temperature, equipment, maintenance, and settings.
Can my electric bill go down during a cold front?
Yes. If cooler weather reduces your air-conditioning use and you need little heating, your total electricity consumption may decrease. The result depends on your home and how you use heating and cooling.
Tired of Electric Bills That Change With the Weather?
Florida homeowners deal with hot summers, unexpected cold fronts, and electricity costs that can vary throughout the year.
While you can’t control the weather, you can explore ways to manage your home’s long-term electricity expenses.
Solar Near Me helps Florida homeowners compare solar options from multiple providers based on their actual electricity usage, utility, and home.
