Sizing mini-split for cooling & humidty control.
We are building a small cabin in CZ 6. It is a seasonal cabin that will see limited winter use so while we do want a mini split that will heat the space we are not concerned if it ends up being undersized. There is so much free firewood in the area that the Forest Service and private land owners often burn huge slash piles in the winter just to get rid of it. I also have access to hundreds of board feet of free hickory cut-offs from a local cabinet shop. So we’ll have a wood burning stove regardless.
As I talk to local contractors it seems some are stuck on sizing the unit for heating and thinking the cooling functions will be good enough.
I don’t believe any of the contractors will use Manual J methods so I plan to do that part myself. I have read the related GBA articles on that subject.
Cabin is 640 square feet and has about 6900 cubic feet of interior space. We are getting recommendations for 12,000 or 18,000 BTU mini splits. If we are indeed on the fence between those two sizes I want to make an educated choice between the two.
We are concerned about humidity control. I know there are mini splits with a drying modes but that aside I have a question about humidity control in cooling mode.
Specifically will more humidity be removed with a slightly smaller unit that will move more air across the coils or a slightly larger unit that will ramp down and move the air more slowly across the coils?
It’s possible this has been covered in a GBA article I do not have bookmarked. A link to an article that covers this would be appreciated.
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