Today's question is from Alazrielle. "Hey Dan. Will the MRCOOL brand ceiling cassettes work with the DIY line sets? Or in other words, could I purchase the ceiling cassette separately, and install them with a DIY condenser and line set?" No, they will not work out of the box with the DIY since they are made for the Olympus series. They would need to be modified by a pro to work with a DIY You won't be able to install it as a DIY and will need a professional to be installed.