While technically not a DIY project we decided to switch our oil boiler and an undersized SpacePak air conditioning system with a geothermal HVAC system. It should save us between $250 and $300 monthly on fuel bills. That's a very conservative estimate, I'll post the actual savings as we get the system up and running. Also we should drastically increase the comfort level in the house as well.
With the undersized SpacePak if the temperature got above 85 degrees the system just couldn't keep up. We would set the thermostat at 68 and parts of the house would reach 90 degrees in the evenings. If night time lows dipped into the mid 60s things would cool off but if it stayed warmer the house never could catch up. With the heat this summer we had to do something.
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