Why Is My AC Unit not Blowing Cold Air?

It has been a long hot day and you just arrive home from work. It feels warmer than normal in your house.  You check the thermostat and it reads 78 degrees. You know something must be wrong. The fan is working and air is coming out of your vents but the air is not cool.  What could be the problem?

Clogged filter

One reason your AC unit could not be cooling properly is the air filter is clogged. It is recommended to replace your air filter every 3 to 4 months. Similar to an oil change your AC unit must be serviced just the same and replacing your filter is part of that.  When the filter is clogged with dirt or debris the unit can not filter the air properly causing it to have to work harder.  The air will not be as cool or clean as it would if your air filter was replaced. So, if your AC unit is blowing warm air try replacing your air filter first.

Low on refrigerant

Your AC unit blows out cold air using a gas called refrigerant there are currently two refrigerants that are used in AC units to help them cool your home down. Over time the refrigerant levels can begin to drop and not blow out cold air.  Once the refrigerant levels drop low enough the ac unit will freeze up outside and cause only warm air to be produced.  When this happens, a technician will need to come out and fill up your AC unit with new refrigerant and top if off. In not time you will have cold air blowing again.


A sure way to ensure that your AC unit will be blowing nice cold air all summer long is the have a maintenance done on it in the beginning of the season.  A 21-point inspection will have a technician look over all the working parts of the ac unit and make sure all the refrigerant levels are topped off and the check the filter to make sure it is clean.  Once this is performed you are sure to have a cool running system all summer long.

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