Lack of refrigerant is the primary reason if this is a new problem and things have worked well in the past. Freon leaked out during the winter. Without a full load of freon, the unit cannot exchange the heat per the design, so the unit runs longer trying to cool your house. That longer running means more electricity which means a bigger electric bill. If the freon is full, the next reason is a dirty AC if you are having problems on the hottest of days. The fins on the unit can get so dirty that the heat exchanges do not go according to specification and the unit gets out of wack. May be shuts down. This happens on the hot days as this critical condition comes into play. Wash off the fins. Pollen sticks to the fins like crazy.
Answers & Comments
Bad thermostat mounted by the fan.
it probably needs to be checked to see if it is low on refrigerant
Low of refrigerant or the unit is too small for the square footage of the home.
Lack of refrigerant is the primary reason if this is a new problem and things have worked well in the past. Freon leaked out during the winter. Without a full load of freon, the unit cannot exchange the heat per the design, so the unit runs longer trying to cool your house. That longer running means more electricity which means a bigger electric bill. If the freon is full, the next reason is a dirty AC if you are having problems on the hottest of days. The fins on the unit can get so dirty that the heat exchanges do not go according to specification and the unit gets out of wack. May be shuts down. This happens on the hot days as this critical condition comes into play. Wash off the fins. Pollen sticks to the fins like crazy.
Low performance, can be caused for a number of reasons including improper sizing.
You have the fan set on "On" instead of "Auto" OR the air conditioner needs coolant.
It doesn’t