For a year. Green building , energy efficient home, conservation,radiant barrier, energy efficient homes, r adiant barrier, home insulation, building a new house? About us... is drawn into the clothes dryer to dry clothes using the 200 watt tumbler motor as opposed to the 6,000 watt heating element to dry your clothes. Our patented mass wall system... using radiant barrier rejects so much heat at the exterior (in sunny climates), that all the hot water needs of the home can be met, typically without back up just by running pipes...