As a technical trades instructor and licensed Mechanical Contractor I am always interested in ways to condition older homes and buildings during the humid Michigan summers.
I have discussed the following product with my clients and students and thought it was worthy enough to be added to my site. Space Pak high velocity air conditioning systems use a much smaller air distribution system (2" flexible branch ducts) that allows for less intrusive installation methods than standard duct systems.
The main air handler can be installed in an attic or crawlspace and ducting can be fitted inside walls or small chaseways. There is an outside condensing unit similar but more compact than the standard AC condensing unit and the system is quiet.