I have owned calc for a few days now, and there are a few things I want to know from those who use it.
1. How long did it take you to trust it?
2. Have you ever miss-sized a unit using calc?
3. Do you change the design conditions from what the program states in a particular area?
I have used it for three houses (including my own which I know is oversized). Deviating from the "rule of thumb", as I have been wanting to do, I find that the calc is 1 ton lower than what I would normally put in for a particular house.
And, my partner is having a harder time believing calc. "there's no way I am putting that unit in, it's way to small" is what I am hearing.