I had to replace my old HVAC because it was old and had a freon leak. The new unit doesn't cool down the house like the old system. The ac runs all day and it takes hours to get down to 72 degrees and sometimes it goes up from 74 to 75 with ac running. Outside temps are usually 85 to 95 The old unit within 2 hours house would be cold. Even though new ac running all day I get a similar electricity bill. Is this normal my new ac takes forever to cool the house down?