After getting three bids, I decided to go with a contractor that offers the package (A/C, Furnace and EAC)that I like (American Standard) at a fair price. I called him and asked about doing a load calc to make sure it's sized correctly. He reiterated that he didn't really think it would be off from his estimate and load calcs are off sometimes too, but if it would make me feel more confident, he could get a guy out there to do some measurements. He then called back and said that the guy couldn't get out for a few days and it would speed things up if I did some measurements and gave some information on windows, insulations, etc., sketched out my house and faxed it in so they could run it through their program. (the need for speed is that our AC is out and it's getting warm here in St. Louis)
So my confidence in them is shaken some now. Everything I've read here strongly recommends switching contractors if they balk at doing a load calc. We've used them for service in the past and had been very satisfied with their thoroughness, communication, and work.
I should say that we have a standard looking starter home, 1140 sq. ft. ranch style with finished basement that is very common and may be among the easier to eyeball or trust that the size is similar to the previous units.
My question is, should I lose faith in this contractor?