Mitsubishi Slim Duct (SEZ) in unconditioned attic?
I live in a two story colonial with an unfinished attic (insulation on attic floor) in NJ. The house has a single zone 2.5 ton A/C that does not sufficiently cool the 2nd floor. All 3 bedrooms are upstairs. We typically set the thermostat to 67F in July/August. That’s the only way to get the upstairs somewhat tolerable (<75F). Had a HVAC contractor over and he suggested two Mitsubishi slim duct (SEZ-KD12NA4R1.TH) installed in the attic. One to serve the master BR and the other one to serve both kids rooms. It would be connected to a multi outdoor unit (MXZ-2C20NAHZ2 or MXZ-3C24NAHZ2). This would allow us to separately control master BR and kids BR’s temperatures. What got me thinking is that Mitsubishi recommends installing the SEZ units in a dropped ceiling or closet. Can these be installed in an unconditioned attic as well? The gets up to 130F on a sunny day in the summer, so I am a little worries. Would a traditional air handler be a better idea?
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