On Tue, 25 Jul 2006 16:48:44 GMT, "JoeSpareBedroom"
wrote:

Just after I moved into my (used) home, I had the AC unit cleaned & checked
over by a company I've been happy with for 22 years. It got a clean bill of
health. This was in September, though, so there was no really good way to
watch it do its thing for any length of time. I'm finding that on a very hot
day (92 outside today), the system runs almost constantly to keep the house
at 76. If I set it at 77, it cycles on for an hour, off for two, and the
house is comfortable. I don't NEED that extra degree, but I'm still curious:
For a given house, and a particular AC unit, is there usually a point where
it just won't do more? Or, does this mean that the previous owners didn't
have the right unit installed?

By the way, the attic is vented & insulated perfectly.

Sound like your system is designed perfectly.

The downside is that it can't quite maintain on the hottest days.

The upside is that it keeps the house dry and comfortable with
minimum energy usage.