If there are enough "warm" days, using air source can conserve the ground thermal mass for the colder days. Or you can make a heat pump water heater, either if the geothermal doesn't have a desuperheater or if there are times when neither heating nor cooling is needed but hot water is.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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