I am planning on installing a MRCOOL 5 ton heat pump system in my 42’x64’x14’ pole building as I am all electric and don’t really want to add a propane tank. I am planning to have 2” closed cell foam in the walls and blown in fiberglass in the ceiling to R60. I am planning on placing the furnace halfway on one of the 64’ walls, going up the wall and to the middle of the ceiling, installing a t, and then taking the duct work down the length of the building. I was planning on using spiral round duct and was figuring on 18” duct. Will this size of duct be best, smaller or larger? How many outlet vents would you suggest? The building is located in Nebraska also.
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