Nice work. I wouldn't even consider tackling something of that magnitude.

The wife and I (but really, mostly me) are considering getting our AC system "zoned." I.E. having three zones in the house each with independent temp control, one for the basement, main floor and second floor. Right now with the hot summer we're having I set the main floor at 70 during the night so that I can sleep, which drops the 2nd floor (and therefore the master bedroom) to about 73-74, but the basement goes down to about 60. I'd like to be able to keep the 2nd floor nice and cool without having to spend extra money cooling the main floor and basement, plus if we go down to the basement home theater we literally wrap ourselves in blankets to stay warm

Internet research has given me a VERY rough estimate that it would cost about $2k - $5k to pay a someone to do this for our 3800sf house, but that we'd save about 20% per month on our heating/cooling bills. Any thoughts on this?