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[Gene GeRue <genegerue AT ruralize.com>]

> Anyone have ideas (or opinions based on reality) about using basement
> cold for house cooling.

I left three openings in our floors above the basement. We often use 
fans to bring the basement air up into the house forcefully. Have 
never worried about molds in this leaky old house. An exotic design 
using stones as a heat sink would take up a lot of room and cost for equipment.

If you do decide to have air flow upwards make sure there is a vent 
bringing in fresh air to the basement from the outside. If you have a 
gas-fired water heater down there there should already be a vent. 
Make sure the size is appropriate for both the heater and the 
ventilation upwards.