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A geothermal heat pump could be a good solution if you're willing to do some of the installation and you have room for the ground coil. While the initial cost can be a little high, they are extremely economical to operate and you have the added benefit of air conditioning in the summer.
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*** OF GREAT WORTH *** And JESUS asked again, The Kingdom of GOD, how shall we think about it, and to what can it be compared? Is it not like a Dark blue 427 Cobra, which a man found parked on his street one day? He hurried off and sold all that he had; the 57 Thunderbird, the 63 Stingray, the XKE, and bought the dark blue 427 Cobra. The disciples frowned and scraped their feet; JESUS grinned and popped the clutch. --- Harris Wolfe
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