Heating and Cooling pros and cons in The Shop Posted November 3, 2014 · Report reply I have a mini split but it ain't installed yet. I have done hvac for a living for 12 years and it was my first choice for my well insulated garage space Safe to assume you're installing yourself? I've received quotes in my area that are more than double the retail cost of the unit itself. I understand that it generally only takes a few hours to install these. In your opinion, is this something a DIYer can tackle? I can easily do the wiring myself and from what I can see through YouTube videos the install seems very simply. I'm trying to understand how guys can charge 6k for a 18k BTU unit?