re: Anyone here have their entire house spray foamed?

Mine is walls and ceilings. We doubled the size of our house several years ago to about 3800sf. We made the decision to spray foam it and it has been the best decision. We run 2 4 ton units and my electricity bill is the same or lower at times than pre spray foam with a single unti. Bill runs between $125-175 per month. I have both wood and gas fireplaces and dont have any issues.

Your chimney may not be tall enough vs your roof line to draft. When we added on and changed to roofline our architect made us elevate the chimney about 3 feet.