Why does my outdoor unit look like it is blowing smoke?
If you have a heat pump operating in heating mode, a brief cloud may be steam from its defrost cycle. The unit warms its outdoor coil to melt frost, then returns to heating. This explanation does not apply automatically to a cooling-only AC. Actual smoke, flames or sparks are not normal defrost.
What should I do if I suspect actual smoke?
Keep away from the equipment. If there is fire, visible smoke or an immediate electrical danger, move to a safe location and call 911. Do not open panels, approach to smell the unit or wait for a website appointment. A cloud's color alone cannot establish that it is safe. If you cannot tell what you are seeing, keep clear and seek help.
Why can this happen during San Antonio heating weather?
A heat pump's outdoor coil can collect frost in cold, damp conditions even when outdoor air is above freezing. Defrost may briefly change the unit's sound and stop its outdoor fan. Persistent ice, repeated prolonged defrost or failure to heat deserves professional evaluation. See Trane's explanation of heat-pump defrost.
What information helps a technician?
From a safe location, note the thermostat mode, whether the home is heating and when the symptom occurs. You do not need to identify the failed part. Our heat-pump and furnace guide explains system differences without opening panels.
For a non-emergency operating concern, contact Amazing Air Solutions in San Antonio and describe the symptoms. Also read why water may appear near an outdoor unit and the winter heating checklist.