Can a ceiling cassette be exchanged for one of the wall units? If so, what sizes and at what cost?

Thank you for your question. We do not have MRCOOL ceiling cassette air handlers for use with DIY systems. However, we do have several design your own systems available which allow you the flexibility to pick which type air handlers you would like with your system. To view some of these available systems please Click Here. For more assistance, please give us a call.