C W Burfle posted:You guys have more experience than I. I only operated a manually controled heating / cooling system for a 2,900 seat theater that was built around 1930.
My points about room returns and closing doors is still valid.
CW, I think we are ACTUALLY trying to do and say the same thing. The OVERALL idea is an attempt to bring the air from the upper levels, that has already been cooled (although it is now mixed and more temperate) and dehumidified to the lowest level, the basement. When this can be accomplished, the basement will become a bit warmer, but certainly more comfortable and closer to the temperature of the remainder of the house.
Having return air openings in the basement without any direct supply from the furnace has essentially put it into a negative pressure situation, hence the house air will fill the void. The furnace then will utilizing the more humid and cooler air in the basement to recirculate through the cooling coil and the whole system will eventually reach equilibrium.
That should clear everything up for everyone. 
