Benefits less a/c expense if I can get enough dirt to make equal to a underground type storage facility

QUESTION:

I am examining the posibility of building a cinder block room in back of house, and then covering it with dirt from a pond, to create a underground root cellar type enviroment. Benefits less a/c expense if I can get enough dirt to make equal to a underground type storage facility (note: to non-floridians around here you can not set your foot down without the possibility of hitting water). Benefit hidden, plant trees and bushes around for addition food source. And then the pond...thats a whole food supply thing by itself...

ANSWER:

The major problem that you will have with this is that at best, you're only going to be able to get the temperature down to about 72 degrees F. This is because that is what the ground temperature for most of the state is, though Southern Florida may be another degree or two higher. There may still be good reasons for going ahead with this sort of project, but I'm afraid temperature reduction isn't one of them. You'll have some heat transfer from the surrounding air to add to that. I'd be willing to bet that you'll probably not be able to get it past the high seventies in the summer.
Providing you're not in a flood prone area, such a structure would make an excellent storm shelter and with suitable planning and placement would make a very defensible point. The extra earth berming would moderate temperature swings so even a small a/c unit should be able to get the temperature down into the sixties without tremendous expense.


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