hvac-calc question about shgc assumption
So HVAC_CALC doesn't have an input for SHGC. It gives you the option of low-e and then talks about tinting or reflective coatings.
I have a close call between 2 and 2.5 tons. The SHGC of the windows are .28 which I think is lower than what would be assumed. The windows represent over 50% of the heat gain so just a small change makes a big difference. If the programs assumes .4 then I will definitely be fine.
Right now I am at 17k btu sensible gain and that includes 10 people (lots of guests) and 1200 from the kitchen. I went with the tight designation but even that was tough to say. It will be new so I just assume that I should go with tight although I am not using spray foam.
The contractors Man J has 2.5 tons and I'd like to be comfortably in the 2 ton range to disagree with him.