"So I have to ask...how's the system handling this heat wave? We've got a fan blowing over a bag of ice over here..."
"Awesome. I set it at 80deg before I left the house this morning and came home (6ish) to a nice and cool house -- I just kicked them down to 74 just because we could. We were worried about the uncooled 1/2 of the house, but it's fine, too... it was over a hundred in Concord today -- stepping off the BART train was like stepping into a blast furnace. We're unsure of power consumption, but so far we're VERY happy -- without the upgrades in the AC and white foam roof, I'd be sweating in my underwear over here..."
While the back bedrooms are not climate controlled, we found these at big orange last night and I'll be fitting them into the wall -- they open to the side yard, so they'll be inconspicuous (and affordable). They have both heat and AC and will run on 120V (rather than many AC/heaters which are 220V). The heat option is what sold me as the radiant heat is dodgy in these 2 rooms.