Why does my heat pump blow cold air when set to heat mode
Your heat pump is likely in defrost mode, has a refrigerant leak, or the reversing valve is stuck — all cause cold…
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HVAC (Heating, Cooling & Ventilation)
Practical, step-by-step fixes for hvac (heating, cooling & ventilation) problems — 25 published so far.
Why does my smart thermostat say 'delayed' and not turn on the AC
A 'delayed' message means your thermostat is enforcing a built-in compressor protection timer, usually 3-5 minutes, to prevent short-cycling after a recent…
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Why is my AC blowing warm air and how do I fix it?
Your AC is blowing warm air most often because the thermostat is set wrong, the air filter is clogged, or the outdoor…
See the fixWhy is my AC blowing warm air but the outside unit is running?
If your AC blows warm air but the outside unit is running, the most common causes are a dirty air filter, a…
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Why is my AC blowing warm air even though the thermostat is set to cool
Your AC blows warm air when the thermostat is set to cool usually because the outdoor unit isn't running, the refrigerant is…
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why is my AC leaking water inside the house
Your AC is leaking water inside because the condensate drain line is clogged, the evaporator coil froze and is now thawing, or…
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Why is my AC short cycling on and off every few minutes?
Short cycling usually means your AC runs for only a few minutes before shutting off, then restarts quickly — often caused by…
See the fixwhy is my air conditioner blowing warm air
Your AC blows warm air when the refrigerant is low, the outdoor unit is dirty, the thermostat is set wrong, or the…
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Why is my air conditioner blowing warm air instead of cold
Your AC blows warm air when the refrigerant is low, the outdoor unit is dirty, the thermostat is set wrong, or the…
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why is my ductless mini split leaking water inside the house
A clogged condensate drain line or dirty air filter usually causes a ductless mini split to leak water indoors; clearing the drain…
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Why is my ductless mini-split leaking water from the indoor unit
A ductless mini-split leaks water indoors when its condensate drain line is clogged, the unit isn't level, or the drain pan is…
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Why is my furnace blowing cold air instead of heat?
Your furnace is probably blowing cold air because the pilot light or igniter is out, the gas valve is off, or the…
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