Our unit and house are brand new, we are the first owners. The heat & air guy that came out today didn't seem surprised at all to find a new unit that was low on freon. He acted like initially set up correctly sometimes.
Yesterday I had the thermostat on 78 and my ac ran non-stop from about 9:30 am until sometime after 11:00 pm. The coldest it ever got in the house was 79 degrees
![Smiley: oyvey](//zam.zamimg.com/i/smilies/oyvey.gif)
.
It has been >100 here for several days so I expected higher bills but not
that high.
1 year builder's warranty ftw!