My house has been sitting at about 77/78 degrees when set to 70. I recently had issues with my AC that Chris came out to fix, but something was still wrong. Had David out a second time, and he found my plenum wide open! Completely unrelated to my previous issues (blown fuse!) My attic was colder than my house! I felt a difference in the home immediately and my house dropped 11 degrees in less than an hour of the repair being completed. David was even playing some music that reminded me of my brother who has passed. It was a pleasant experience and I am glad to be COLD in my house again!