Number of zones and system efficiency in Northwest climate
I am setting up a 48,000 btu Mitsubishi outdoor unit for a ~2000 sf home in the Seattle area. I am considering either (2) 24k MSZ-GL indoor units, or (4) smaller units. The floor plan is quite open, and with some added ventilators, I believe can easily distribute the air and/or use remote thermostats so that cold spots will not be an issue with 2 zones. However I am wondering if the minimum capacity will still be too large on these 24k units. Our climate is pretty mild, and I want them to be able to run continuously with minimal compressor short cycling, keeping the house comfortable in the mid-seasons whatever the outside air temp is, 40s-50s. Am I better off with a number of lower capacity units spread around? Is “turndown” performance better on the smaller units, allowing better range of usage throughout the year? I notice that the 24k units on low setting is still so much higher, cfm and everything.. How does my outdoor unit react and use power differently on a system of (2) at 24k, vs. say, (4) at 12K or (3) at 9k plus one at 18K? Thanks.
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