Should I buy a geothermal heat pump large enough to heat with no supplemental heat?
Your contractor should
provide a heating and cooling load calculation (heat loss, heat gain) to guide
yoru equipment selection. Geothermal heat pumps typically are sized to meet
your cooling requirements. Depending on your heating needs, a geothermal heat
pump will supply 80-100 percent of your design heating load. Sizing the heat
pump to handle your entire heating needs may result in slightly lower heating
costs, but the savings may not offset the added cost of the larger heat pump
unit and larger loop installation. Also, an oversized unit can cause
dehumidification problems in the cooling mode, resulting in a loss of summer
comfort.
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