Need some advice. I have a Humvee replica that I'm at a stage of desiding what air conditioning system to use. I want one that will last a long time, not need to be replaced just because a small part broke, will cool the inside, and heat it as well. I'm looking at 3 different manufactures and all look good and are about the same price. The problem is I'm limited to space where the system can be placed. It has to be less than 23 inches long. I want it to have full electric, no vaccume lines. Problem is the 3 manufactures only offer systems that the fan has low mid and high speeds. I want variable. I've considered going to a junk yard and getting a system say out of a expedition or sub. Any suggestions.