The AC is new maybe a year old and is cooling fine. I bought the unit and installed it myself replacing the original 1997 unit. I have a maser electrical license and have taken courses in air conditioning refrig. I recently replace the original thermostat with a programmable digital model,though maybe someone had played with that but it appears to be set properly. I haven't had higher electrical bills, my bills have actually dropped because of the newer more efficient unit. I think I will do a search an see if I can find the post concerning heat strips,could be I misunderstood what was said.