Loren Faeth wrote: > they use ground temps, usually about > 54 degrees, and thus operate in the heat pump's efficiency range.
I've heard that if you go deep enough, temps equal the average annual surface temp. I think 10-20' down keeps you around 40-50 degrees here in southern Michigan. Building code calls for 42" deep footings, which is just below the assumed winter frost line. _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
