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Hi ltf, Sure did consider ground source heat pumps (GSHP) but the numbers were not cost effective even for Arizona the heat pump (HP) dream land of the USA. AZ is considered the best place for a HP because it averages 45F during the winter time with 30%RH. It just don't get any better than that for HP efficentacy. The proplem with GSHP is the intial unit cost and higher installation costs. With these figures added in, the "total overall costs" are much higher than a typical HP even with the energy savings added in. If that wasn't the case, we would be installing them very fast, when in fact there an extremally hard sell item. Theres another consideration for any type of HP. They don't feel like there heating to the average homeowner, anotherwords the preceived warmth felt by a human will not be the same and people tend to feel on the cool side although the room temperature is the same. This is because a HP average output temps are 115F while a typical gas untit is 130F. The same problem occured for people switching from wood heat to gas forced air heat. The air movement is the problem. Any air movement during heating and you feel cool, but during cooling season the air movement feels good. As any new item comes to market theres allways a big savings claimed but rarely that is the case. HP when they first hit Denver back in the 70's had the same sales hype, but in realility HP's were over three times the cost to operate not facturing in the additional unit cost. Something else to consider is how Electricity came to be installed in every home. Back 100yrs ago every farmer made his own electricity by wind generators. They were simple units and very efficent and the farmer could work on the unit himself adding big savings over hiring service people. The electric utilitys came in and offered the farmer almost free electricty, free upkeep, provided that the farmer would give up his windmill when the "new" electricity was installed. With in 3yrs there was no more windmills to be had and the company's making them went out of business, then the electric utilitys raised the cost to double what the farmer was paying to maintain his own unit and within another 3yrs doubled again. History does repeat it's self and the Electric company's are really pushing hard for the same thing to happen once again. Just another thought! T_Bone
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