Take a look at this Mitsubishi Mini HVAC system inside the attic of a house. This mini HVAC system is tied to a VRF city multi compressor on the outside of the house. In this video, Matt Risinger goes into detail about Mistubishi Mini HVAC system and installation process. Risinger digs into the placement, how it works," the materials it is crafted with and the reasons he really loves the Mitsubishi Mini HVAC Systems. The system can be super-efficient and work even in the smallest spaces.