Charles wrote:

... the amount of cooling is miniscule in any case.

Would you have any evidence for this article of faith? :-)

No, just that I tried it (anecdotal evidence is not really evidence, of
course).

Southwest PA ... a little town ...

NREL says the average deep ground temp in Pittsburgh is 50.3 F. A 2400 ft^2
basement floor with a 2 Btu/h-F-ft^2 airfilm resistance could contribute
(75-50.3)2400x2 = 118.6K Btu/h (10 tons) of cooling to a 75 F house before
it warms up. The ASHRAE HOF gives 8 Btu-in/h-F-ft^2 as a conservative soil
conductance for earth cooling.

Nick