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I have a potential customer who wants zoned AC in a small office space using a multi-split heat pump. Did a load calculation & found that each office requires 5-600 BTUh of cooling, obviously mini splits are a bad idea (smallest indoor unit I can find cools to 9000 BTUh.). So I am looking at other ideas.
The entire office suite is only 1250 sq ft and could in theory be cooled by one mini split if it were open concept, but each office/room requires its own zone.
I've been thinking about presenting the customer with other options, such as zoned ducted AC with a variable-speed air handler and motorized zone-valve style dampers. However, I'm not up on AC duct sizing. Don't want to undersize.
Is there a sizing rule-of-thumb for AC ducts, something I can do to get a basic calculation of sizing for the purposes of working up an estimate?
I am doing a duct design course this winter but this job came up too early!
Thanks guys! If anyone has other ideas on how to configure this system, I'd love to hear these also