Solar Hot Air Heater Video From Missouri Wind and Solar

I live in Colordo springs, Colorado. On the coldest days of winter the furnace is on and off all day and night. (it averages 8 min. on and 21 min. off) I checked all the floor vents in my house and the hot air that comes out is about 130 degrees f. It seems to me that if you were to add a second intake and exhoust vent that you could double your air flow and the air temprature should still be high enough to keep you comfortable while the sun is shining. Give it some thought…

very nice 5 stars