[gfmucci]

Johnny:* Ahaa!* :bigthumbsup: I understand.* Yes, in our previous house we had built, I had them upsize the central AC unit - it didn't cost that much more.* Not to AC the garage, but to just have the extra capacity for the hottest days.* If you both upsize the central system AND install ducts to the garage AT THE TIME THE HOUSE IS BEING BUILT - si, that would have great cost/benefits.* Thing is, AC people will tell you if you oversize the central system too much, you won't lower the humidity enough.*

That's why dual zone systems are recommended - not just opening and closing ducts, but having two separate zones with separate thermostats.* That's why I'm getting a separate unit, called a mini-split, for the garage, Susan. It is a small separate system where the blower is mounted high up on the garage wall, inside, and the condenser unit is outside, next to my main, pre-existing condenser unit i.e. a smaller version of the split (inside/outside units) central AC system that comes with the house.* You have the best of both worlds with this set up.* Google "mini-split AC" for further explanation and some examples.

Susan, the need to construct the benchwork for the train layout may be my justification for my first ever table saw.