There are a number of reasons a window air conditioning unit is not blowing cold air, from a dirty filter to simply being worn out.
So lets take a look at some of the top things to look for when a unit stops blowing cold air into a room.
Reasons a Window A/C Unit is Not Blowing Cold Air
- Be Sure the Thermostat is Set Low Enough
- Dirty Air Filter
- Clean the Outside Fins of any Debris
- Clean the Inside Coil
- Check if the Outside Condenser Fan is Blowing Air
- Does the Compressor Turn On?
- Low on Refrigerant
A dirty air filter can block air flow and cause a unit to stop working.
The air filter is usually located inside the front cover and each unit has its own procedure to replace or clean it.
If the fins become clogged they can stop dissipating heat and the unit will stop working.
A quick way to fix this is with the unit off use a hose to blow out anything that may be blocking the fins.
Be careful not to bend the fins as they are easily bendable and will restrict the air flow if bent.
The inside face plate cover will likely have to be removed and will depend on the unit how this is done.
Don’t use any chemicals to clean the inside coil as they will smell as they are blown into a room.
Use plain water and clean the dust or any build up that has occurred.
Again be careful not to bend the small fins.
If the outside fan stops blowing the unit will not work.
Some outside fans work only intermediately and shut off to save energy when not needed. Most Window A/C units use the same motor to turn the inside and outside blades but they can be separate.
There is no need to open the unit up to see if it is turning as you should be able to feel the air moving past the outside of the unit.
Be sure to check the outside fan when the unit is not working since it should be on and blowing hot air away.
It is basically a pump that cycles the refrigerant throughout a unit.
It is usually noticeable if a compressor has gone bad since the noise the unit makes will have changed.
Usually a unit low on refrigerant will be replaced but they can have refrigerant added back into the system.
Some skills and basic tools will be needed to get a unit recharged.
Once general maintenance and main components are checked if a unit is still not working it is likely time to replace it.
A professional can be called to fix it but is likely not worth the effort since the cost is usually more than replacing the entire unit with a new more efficient model.
There are many affordable options even quiet units if a new unit is needed.