How safe and econimacal would it be to heat the crawl space underneath the floor? I'm thinking why couldn't I heat the crawl space up and that would radiat the heat evenly all throughout the house. I shouldn't have to worry about my wife's cold feet when we go to bed! Could I place a portable electric heater underneath the floor and rig it up to a thermostat located in the bedroom hallway? My crawl space is two cinder blocks high and my small house is almost 900 s.f. Right now I heat with a woodstove only, located in the living room and it gets really cold in the back bedrooms. Also, if I could heat the floor crawl space in the winter to keep the house warm, could I cool the attic down to keep the house cool in the summer time? Thanks for any input/advice/tips, etc.