Homeowner answer
Why is my electric bill so high in summer?
A higher electric bill in Florida usually means the AC is running longer, either because the weather is hotter or because the system is working harder than it should due to a dirty filter or coil, leaky ducts, low refrigerant or age. Compare usage with the same month last year, then book a maintenance check.
Can wait
Not urgent, but a system working harder than it should can be heading for a breakdown. Book a maintenance visit in the coming weeks.
Updated
The AC uses more power than anything else in the house, so when the bill jumps, it is usually because the system ran longer — sometimes just because the month was hotter, sometimes because something is making it work harder. Compare before you worry, then work down the list.
What you can safely check
- Compare usage, not the dollar amount
Do this:Find the kilowatt-hours on this bill and compare them with the same month last year, since both rates and weather change what you owe.
You should see:A clear answer: usage genuinely higher, or the bill driven by a rate change or a heat wave.
When to stop:Stop there if usage is flat — nothing is wrong with the AC, and the utility or the weather owns the rest.
- Check the thermostat and its schedule
Do this:Make sure the schedule, setpoints and mode are what you expect, and that nobody left the fan on On around the clock. On a heat pump in winter, look for a stuck emergency-heat setting.
You should see:Settings that match your routine, and a fan that goes quiet when cooling stops.
When to stop:Stop and book if emergency or auxiliary heat was running — heat strips draw heavily and usually mean a heat pump that needs attention.
- Replace a dirty filter
Do this:Slide the filter out and hold it up to a light. A clogged filter makes the system run longer to move the same air, so replace it with the same size if it is dark.
You should see:Stronger airflow at the vents and, over the following days, shorter running times.
When to stop:Stop and switch cooling off if you see ice on the copper lines or the indoor coil — follow the freezing-up guide.
- Look over the outdoor unit
Do this:Clear leaves, grass and debris from around and on top of the unit, and glance at the coil fins through the grille. Dirt and salt crust make it harder to shed heat, so it runs longer.
You should see:Open space all around, a steady hum and a spinning fan, with warm air rising off the top.
When to stop:Stop at the grille — a coil that is truly caked needs a proper cleaning by a technician, not a garden hose or a brush.
- Watch how long it runs
Do this:Over the next few days, note whether the system runs almost nonstop, cycles normally or shuts off quickly, and whether any rooms stay warm or damp.
You should see:A pattern you can hand over: near-continuous running with warm or damp rooms points at airflow, ducts or refrigerant.
When to stop:Stop after a few days of notes — with a clean filter and sensible settings, higher usage is a diagnosis for a technician to make.
Likely causes
- Hotter weather or a rate change
A hot month, or a new rate from your utility, raises the bill without anything being wrong.
Handled by you
- Dirty filter
Restricted airflow makes the system run longer to move the same amount of cool air.
Handled by you
- Dirty indoor or outdoor coil
Dirt and salt on the coils make it harder for the system to move heat, so it runs longer.
Handled by a technician
- Leaky ducts
Cooled air lost into the attic has to be made again, and hot attic air gets pulled in.
Handled by a technician
- Low refrigerant
An undercharged system cools less for the same electricity, and the leak needs repair.
Handled by a technician
- Backup heat running in winter
If a heat pump is failing, the electric heat strips can carry the load and use much more power.
Handled by a technician
Call a pro when…
Book a maintenance visit if usage is up compared with the same month last year and the filter and thermostat settings check out.
- Kilowatt-hours keep climbing after the filter, settings and outdoor unit all check out.
- The outdoor coil is caked with dirt or salt, or the fins are bent — leave the cleaning to a technician.
- Some rooms never get comfortable, or the house feels humid — the system is working harder than it should.
- The backup or emergency heat runs in winter, or the outdoor unit ices up.
- The system runs almost nonstop even on mild days.
Next step
Book a diagnosis
Enter your ZIP and we’ll open the online scheduler of the local company that serves your address.
Common questions
Does AC maintenance lower electric bills?
It can. Clean coils, clear airflow and a correct refrigerant charge help the system cool with less running time, though how much you save depends on its condition.
Should I turn my AC off when I leave the house?
Turning it up rather than off is the usual advice in Florida. A higher setpoint while you are out saves energy, while switching it off completely can let humidity build up in the house.
Will a new AC lower my electric bill?
A newer, efficient system that is correctly sized and installed on sealed ducts typically uses less energy than an old one. How much less depends on the old system, the new one and how the house is used.