You do not want to form ice, requires heat of fusion to be withdrawn from evaporator.
For best efficiency, you only want the evap coils to be just below (about 3C) the dew point. Use a RelHumidity sensor from scrap dehumidifier.
re: Evap: I can go either air or do another DX borehole, this time maybe do 2 boreholes?
In dehumidifier usage, any borehole would be the CONDENSOR.
Evaporator is where you boil the refrigerant, which pulls heat from the air to boil the refrigerant and cools the coils to condense air moisture.
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