Why is my air conditioning not cooling my house?

There are many potential reasons why your air conditioner isn’t cooling, which might require solutions that are either simple and inexpensive or might require a complete replacement of the unit. Potential issues may include an air conditioner that is too small, an air conditioner that is too old, a dirty air filter, blocked coils in the outdoor unit, dirty coils in the indoor unit, a frozen evaporator coil, to name a few.