Sizing a minisplit for supplemental heat
I’ve been asked to quote a mini-split for a ~832 SF yoga studio that’s part of a larger physical therapy/gym complex in a recently renovated low-rise commercial building. The yoga studio has only one exterior (south-facing) wall with large windows; the other three walls adjoin spaces that are conditioned year-round.
Exterior surfaces [wall (185 sf net) , roof (853 sf) & slab floor (32lf exposed)] appear to be insulated; windows (85sf) and skylights (30 sf) are modern double pane. Maximum occupancy is reported at 15 people.
The studio is currently served by the central HVAC system, with three supplies and one return. The customers report that the room is cold in winter and undercooled in summer.
My question is how to account for the existing HVAC and air exchange with adjacent spaces in my sizing calculations.
Ultimately, I’m hoping to propose a Mitsubishi 1:1 high wall unit with Hyperheat. I’m used to aggressive sizing in residential settings but not as confident in my initial forays in light commercial.
Thanks in advance for your thoughts.
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