try eliminating the exterior conceal of the AC unit. verify out the coils interior to verify it is not grimy. I had this ensue this summer season, and it become warm that day! we live in a condominium unit, and the owner did not sparkling it out between renters, so it become CAKED with airborne dirt and airborne dirt and dust, yet we had replaced the filters month-to-month and made specific the intake crate become sparkling. had to gat a expert accessible to verify what become happening. each now and then this could ensue if it incredibly is incredibly warm exterior and you have it became way down like at sixty 5 or sixty 8 ranges. a typical AC is in basic terms able to cooling 20 ranges cooler than it is exterior, so if it incredibly is ninety 8 ranges exterior and your AC is became right down to sixty 8 ranges, it is going to freeze up attempting to kick back your domicile, and deplete ALOT of ability.