Cold Snap Troubleshooting
Heat Not Working in Florida? Heat Pumps, Heat Strips and Furnaces Explained
Florida homes may run the heat only a handful of nights a year, so when the heat is not working during a cold front, it catches people off guard. Here is how each type of heating system behaves, what is normal, and when to call.
Know Your System
Why Heat Not Working in Florida Is Often a First-Use Problem
Most Gulf Coast homes heat with one of three setups: a heat pump that reverses its refrigerant flow to warm the house, electric resistance heat strips inside the air handler, or a gas furnace, which is less common here but found in some homes. Many heat pump systems also include strips as backup.
Because heating sits idle for months, the first cold morning exposes problems that were invisible all summer: a heat strip element that failed, a reversing valve that sticks, a thermostat never configured for heat, or a furnace igniter that has worn out. Knowing which system you have makes troubleshooting far easier. Check the air handler or furnace label, or ask us at your next visit.
A quick first check
Set the thermostat to Heat, raise the setpoint a few degrees above room temperature, and give it several minutes. Heat pumps take a moment to ramp up and may deliver air that feels lukewarm compared with a furnace, even when working correctly.
What's Normal
Heating Quirks That Are Usually Fine
These surprise a lot of Florida homeowners, but they are typically part of normal operation.
Brief burning smell at first start
Dust settles on heat strips or furnace parts over the off-season and burns off the first time they warm up. It should fade within a short while.
Steam from the outdoor unit
In cold, damp weather a heat pump periodically runs a defrost cycle. You may see vapor rising and hear a whoosh as it switches.
Air that feels lukewarm
Heat pump supply air is warm, not hot. It heats the house steadily but can feel cooler on your hand than furnace air.
Long run times on cold nights
Heat pumps work harder as outdoor temperatures drop, so longer cycles during a cold front are expected.
Not Normal
Burning Smell When the Heat Turns On: When to Worry
A faint dusty odor that disappears is one thing. A smell that persists, gets stronger, or resembles melting plastic or hot wiring is another. Turn the system off at the thermostat and breaker and call for service. It can point to an overheating blower motor, a failed strip element, or damaged wiring.
With gas furnaces, the stakes are higher. If you smell gas, leave the house and call your gas utility or 911 from outside. A working carbon monoxide alarm is essential in any home with gas appliances, and a yellow, flickering burner flame instead of a steady blue one deserves a professional inspection.
Backup Heat
Heat Pump Emergency Heat: What That Setting Does
Many thermostats paired with heat pumps have an Emergency Heat or EM Heat setting. It shuts off the heat pump's compressor and runs only the electric strips. It exists for one reason: to keep you warm if the outdoor unit fails.
When to use it
If the outdoor unit is clearly not running, is iced solid, or is making a grinding noise, switching to emergency heat lets you stay warm until a technician arrives. Strips draw a lot of electricity, so this is a temporary bridge, not a setting to leave on.
When auxiliary heat comes on by itself
An "Aux" indicator on the thermostat usually means the strips are helping the heat pump during a cold spell or defrost cycle. That is normal. If Aux runs constantly in mild weather, the heat pump may be low on refrigerant or failing, and it is worth a service call. Our comparison of heat pumps versus straight AC systems explains how the two designs differ.
Common Heating Failures by System Type
Match the symptom to your equipment to get a sense of what the technician will check.
| Symptom | Heat pump | Heat strips | Gas furnace |
|---|---|---|---|
| Cold air from vents | Stuck reversing valve, low charge, thermostat setup | Failed element or sequencer | Ignition or flame sensor fault |
| Breaker trips on heat | Compressor or fan electrical fault | Shorted element or wiring | Inducer or blower motor issue |
| Runs nonstop, house stays cool | Low refrigerant, dirty coil, outdoor unit iced | Only one strip stage working | Dirty filter, airflow restriction |
| No response at all | Thermostat, power, float switch tripped | Limit switch, power | Safety switch, gas supply, control board |
Getting It Fixed
Furnace Repair in Florida and Heat Pump Service
Our technicians repair heat pumps, electric strip heat, and gas furnaces as part of our heating and cooling repair service. Each visit starts with a diagnosis and a written, flat-rate price you approve before work begins. If the outdoor unit is the problem, the same refrigerant and electrical issues that cause summer breakdowns are often to blame, and our overview of common Florida AC repairs covers many of them.
Tripping breakers have their own guide on why an AC or heat pump trips the breaker. If your system is aging and heating poorly as well as cooling poorly, our repair or replace guide can help you decide, and we offer heat pump installation in Sarasota when replacement makes sense.
The easiest fix is prevention. A fall check as part of preventive HVAC maintenance runs the heat before the first cold front arrives, so problems show up on a pleasant afternoon instead of a 40-degree night. Call (941) 417-4848 to book.
Common Questions
Questions Readers Ask
Why is my heat pump blowing cold air in winter?
Short bursts of cool air can happen during a defrost cycle, which is normal. If the air stays cold, the thermostat may be set to Cool or Auto incorrectly, the reversing valve may be stuck, or the system may be low on refrigerant. Check the thermostat first. If the outdoor unit is running but the air never warms, call for service.
Is it normal for heat to smell like burning in Florida?
A light dusty smell the first time the heat runs each season is common, because dust collects on the heating elements during the long cooling months. It should clear fairly quickly. A smell that lingers, grows stronger, or resembles melting plastic or electrical wiring is not normal. Turn the system off and have it inspected.
Should I use emergency heat during a Florida cold snap?
Only if the heat pump's outdoor unit has stopped working. Emergency heat bypasses the heat pump and runs only electric strips, which use much more electricity. If your heat pump is running and heating, leave the thermostat on normal Heat and let auxiliary heat assist automatically as needed. Switch to emergency heat as a short-term fix while you wait for repair.
How often should a Florida furnace or heat pump be checked?
Because heating runs so little here, a quick check during a fall maintenance visit is usually enough. The technician runs the heat, tests strips or the furnace burner, and checks electrical connections. Homes with gas furnaces benefit from an annual safety inspection of the burner, venting, and heat exchanger. Members of the Reliance Air Club get two tune-ups a year on Comfort tiers.
Can a heat pump work when it gets cold in Sarasota?
Yes. Sarasota's winter lows are usually mild enough for a standard heat pump to heat comfortably. On the coldest nights, a heat pump works harder and may call on auxiliary heat strips for help. That is expected behavior, not a sign of failure, unless the backup heat is running constantly during mild weather.
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