Sizing Minisplit-Air Handler System
I am replacing a multizone oil burner system with two Mitsubishi heatpumps, 2 air handlers and 3 minisplits. I have gone through the manual J calculations and need to figure out how to size the air handlers and minisplits. House is about 2700 sq ft, 2 floors except MBR is 1st floor with no room above it. House is in MA.
Air handlers will connect to 1st floor duct work. Upstairs will use minisplits.
System 1: 36K BTU singlezone – air handler for rest of 1st floor – kitchen, dining room, family room, TV room and part of finished basement.
System 2: 36K BTU Multizone – air handler for 1st floor MBR, 3 minisplits for upstairs.
What happens if the capacity of the air handler and minisplits exceeds the heatpump capacity? For example if the MBR air handler is 18K and the 3 minisplits are 9, 9, and 9. 18+27= 45K. How much above rating is ok? Other than I might not get as much heat as I want, does anything bad happen?
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