Heat Pump Not Heating? 7 Quick Checks Before You Call in Columbia, SC

If your heat pump runs but the house still feels chilly, a few quick checks can often get you comfortable again. Try the steps below, then call our Columbia, SC team if the system still won’t keep up, shows heavy icing, trips breakers, or displays error codes.

For safety, shut off your system and schedule heat pump service if you smell burning or see sparking.

1) Confirm the right thermostat settings

• Set system to HEAT so the pump isn’t bouncing between heating and cooling on mild days.
• Set fan to AUTO so it only runs during active heating cycles.

2) Check and replace a dirty air filter

A clogged filter restricts airflow and can make the system feel like it isn’t heating. During heavy use, check monthly and replace at least every three months (more often with pets or allergies).

3) Make sure power is on to both units

Heat pumps have indoor and outdoor components. If the indoor air handler breaker is tripped or the service switch is off, you’ll get weak or no warm air.

4) Keep supply and return vents open and unblocked

Closed or blocked vents starve the system of airflow and can contribute to icing and poor heat output. Keep furniture, rugs, and curtains clear of vents and returns.

5) Understand the defrost cycle (steam is normal here)

On cold, humid mornings in the Columbia, SC area, light frost can form on the outdoor coil. Your heat pump will briefly reverse to melt that frost; you may see steam and feel cooler air for several minutes—this is normal. Auxiliary heat often helps during this cycle.

6) If the outdoor unit is encased in ice, don’t chip it—let it thaw

A thin, even frost is normal; a solid ice shell is not. Gently remove leaves or debris around the cabinet and let automatic defrost run. If ice doesn’t clear, or quickly returns., turn the system OFF and schedule service. (Common causes include defrost control issues, airflow problems, or low refrigerant.)

7) Expect “Aux Heat” on very cold mornings or big thermostat jumps

When temperatures dip or you raise the setpoint several degrees at once, Aux Heat may kick on to help the heat pump catch up. That’s completely normal. If you find yourself using Emergency Heat, call us; it’s a sign the outdoor unit needs attention and it’s expensive to run on its own.

When to call a pro in Columbia

• Ice never clears, or the unit rapidly re-ices after defrost.
• Repeated breaker trips, burnt smells, or the outdoor fan/compressor won’t start.
• Supply air stays cold even after the checks above.
• The system can’t reach setpoint without Aux Heat for long periods.

We offer same-day diagnostics and repairs across Columbia and nearby communities. Ask about our maintenance plan for priority service and seasonal tune-ups.

FAQs

Why does my heat pump blow cool air sometimes?
During the defrost cycle, the system temporarily reverses to melt frost off the outdoor coil. You may see steam outside and feel cooler air inside for a few minutes—this is normal.

How often should I replace my heat pump filter?
Check monthly and replace at least every three months during heavy winter/summer use. Homes with pets or allergy concerns often need more frequent changes.

Should I close vents in unused rooms to save energy?
No. Keep them open. Restricting airflow can reduce performance and contribute to icing and comfort issues.

Your first choice for heat pump repairs

Still chilly after these steps? If your heat pump is still blowing cool air, call Stoudenmire Heating & Air Conditioning for heat pump repairs in Columbia, SC. We’ll diagnose the issue, verify the defrost and Aux Heat systems, and get your home comfortable again as soon as possible.