In a Cold Climate and Hot Climate: Each ton of heat pump capacity can heat/cool approximately 500-600 square feet.
In a Moderate Climate: Each ton of heat pump capacity can heat/cool 600-700 square feet.
So either a 5.0 ton heat pump in a cold climate
or a 4.5 ton heat pump in a moderate climate.
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2 ton
I would recommend 1 HP
I would go with a 2 1/2 ton to 3 ton unit but to be sure But to be accurate have a HVAC&R specialist perform a J Load analysis on your building.
You install a three ton geothermal heat pump system
That room size can be estimated 15 ft x 40 ft