Minisplit in tandem with a conventional heat pump?
A friend is getting ready to build a 2800 sq-ft retirement home in the hot and humid south, (Houston). His HVAC contractor is recommending a 5 ton, two stage heat pump. This is ~ the traditional 1 ton / 500 ft2 formula that prevails in this area with the added benefit of the two stage compressor. But 5 tons seems like a lot for a tight house and 2.5 tons is hardly the optimal dehumidifier in the light HVAC seasons. The house will be insulated with closed cell foam in the walls and under the roof deck. It is not what you would call an open floor plan.
Our question is would the house be more comfortable with a 3 ton single stage unit for the main house and a 1 or 1.5 ton Mini-split in the Master suit? It seems to us that this could accomplish both dehumidification and partial zoning without unnecessary complexity? Air changes will probably be handled with an ERV.
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