I like the idea Ozz! The price is a little high, I think, but I guess if you want to save propane it might be worth it. Just how long would it take to use $800+ of propane however? You'd definitely have to use the unit fulltime or at least a lot of longtimer and in some cooler climates though! Heck, you being in HVAC, you should be able to come up with this somehow also!