August 10, 2023

Mr. Cool DIY 12k ceiling cassette install part 4

[@mikewelch82]

Hey James, I'm planning to install a Mr Cool ceiling unit in my garage next spring and am trying to plan ahead for the installation. I haven't seen too many videos on the ceiling cassete and this is really helpful. Two questions: - What are the dimensions of the rough opening? - I noticed that the unit is boxed in (might be the subfloor for the next floor?), what size are those joists? My garage is framed with 2x4's at 24 OC so I need to do some framing anyway...

[@emailjamesnewton]

The rough opening is designed for 16" on center ceiling joists. Mine were 24" so I needed to box it in. The length is probably a little over 4 feet. Mr. Cool provides a template to cut the sheetrock to the exact size necessary. My ceiling joists are the bottom chord of a roof truss, only a 2x6. I built the 2x6 up with 2x4's to make them taller in the area and capped this box with a piece of plywood, air-sealed the entire box, and will insulate the roof space on top of this. The unit would fit in a joist bay of 2x10 (or greater) and 16" on center. Best of luck.

[@reneramirez17]

How was the plumbing done for this? Any video?

[@dannyholland493]

But can you install one of the cassettes in a ceiling that you will completely close up and have no attic access? What if you need to service it? Or replace it? Do you need access to get into the attic?

[@jcchan08]

One-way cassettes can be installed in a closed off ceiling if they joists are spaced 16" on center. The refrigerant lines come out one end of the unit so orientation and locating the outdoor unit will be very important to your build. These one-ways were made to address the access issue with the 4 way ceiling cassettes, no attic access required. It would be wise to create an access hatch to get to the threaded refer line connections to disconnect if you ever want to replace it.

[@emailjamesnewton]

Should be ok. All access can be done from below after you remove the bevel.