An over looked thing in this weather is making sure the coils outside are clean. In this heat it really increases the amount of work the AC does. Also the inside filter will block airflow and cause the ac to run longer. You cannot compare the two systems without taking into account system wear and tear and thermal efficiencies of the two houses. My bills with geothermal system, pool ,125 reef and 300 fowlr tank are around $400
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