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I'm going to start switching over to mini-split air cooled heat pumps. Not as energy efficient as ground source. But cheaper and easier to install, repair, replace. Can easily reduce my AC electricity use by 1/2, my current AC is/was rated 13 seer 20 years ago. 26 seer is pretty easy to find and inverse of 26/13 = half the electricity, 30+ are available and would take it down to 43%. Planning on 3 or 4 so will have build in redundancy if one quits still have heat or cooling.
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