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Agree! Cold air is heavier than hot air. Ponder this: A home is actually designed properly for the heating system and not the A/C. A home designed for A/C would have cold air input and hot air returns at the ceiling level. :)

Every room with a A/C/heating duct will also have a cold air return vent. Cut yourself a piece of 3/8 plywood to replace the vent cover. Cut a 6" or 8" hole in the new cover and attach an adapter to receive your exhaust air vent tube from your filter and/or cool tubes. It is a good idea to...

I bought a 12" Sono Tube for about 16.00 and cut it to 30 " I then ran the duct from the fan through the tube and packed sound resistant insulation (Green) all around it. I also wrapped my fan with insulation using duct tape. (The fan remains cool because air flows through it.) My fan had a...

I disagree. The warm air you are feeding the cold air return is not going to affect the operation or safety of your furnace. The term "back pressure" would only result from forcing hot air into a rooftop exhaust vent. The portion of the heating system through which this circulating heated...

This statement is incorrect. I leave my furnace fan running 24/7 .... Why? In the summer I close the basement vents (Cold air is heavier and migrates to lower level) The furnace fan sucks cold air from lower level via the cold air returns and distributes it evenly throughout the house. In the...