CERV96 (and others) - this is really helpful!
What makes me a little concerned is that the original house owner put in 4T system (in 2003) - I would expect that somebody must have done a load calculation for him then, and 4T was the result.
Now, I do know that my system has been typically going the whole day (until, say, 9PM) during the typical summer months. And, based on the HVAC guy and some of my friends, this should not be typical, and might have contributed to the system's epic collapse after 11 years(?)
I have 2 quick questions:
1) how reliable are the programs computing loads? That is, if they say 4.9 T, can I indeed safely assume that 5 Ton is the ideal size?
2) Forget the software, just going by the "expert feel". Say, I have 2,700 sq feet single story house, with cathedral ceiling in the living room that has oversized living room windows (think floor-to-ceiling) facing west.
I live in the place that has the following average summer temperatures:
(all according to: http://en.wikipedia.org/wiki/Fayettevil ... as#Climate
Just based on this - does it seem more like 4T or 5T system?