Step-by-Step Guide
- 1
Select the correct heating mode
Set the remote control to HEAT mode or the heat pump symbol. A target temperature of 20–22°C is recommended for both comfort and energy efficiency.
- 2
Understand the defrost cycle
When outdoor temperatures are low, ice can form on the outdoor unit. The AC handles this automatically by briefly pausing heating to defrost — this is a normal part of operation. Steam coming from the outdoor unit during this cycle is expected.
- 3
Check the minimum temperature rating
Most ACs cannot heat efficiently below –10°C to –15°C. Check the minimum outdoor temperature specification in your user manual. The unit may not operate below this threshold.
- 4
Keep filters clean during winter
Filters accumulate dust in winter use as well. Check every 2–3 weeks and clean if needed. Dirty filters reduce heating efficiency.
Frequently Asked Questions
Can my AC heat in winter?
ACs with a heat pump (cooling and heating) can provide heating in winter. Cooling-only models cannot. Your remote control or user manual will confirm whether your unit supports heating mode.
Is noise from the outdoor unit in winter normal?
During the defrost cycle, you may hear hissing, crackling, or water sounds from the outdoor unit — these are generally normal. However, persistent loud noise may require a technician.
The outdoor unit is completely iced over — what should I do?
Turn off the AC and wait for the ice to melt naturally. If the defrost cycle does not clear the ice, or the ice is persistent, contact a licensed technician. Do not use physical force or hot water to clear the ice.
Is it economical to heat with an AC in winter?
Heat pump technology transfers heat energy from the outside air rather than generating heat from electricity, making it more efficient than electric resistance heaters. However, efficiency drops as outdoor temperatures fall.
The AC is not heating but the fan is running — what should I do?
First check that the unit is in HEAT mode. Then observe the outdoor unit — is it running? If the problem persists, a compressor or reversing valve fault is possible. Contact a licensed technician.