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You guys need to look around for used units at truck and equipment salvages. I got my Red Dot off an asphault sealing truck that was getting parted out. I only paid $200 for the system and that included the compressor. Those rooftop units are also mounted alot on older tractors. I think I...

Thats a no brainer.....don't run a 24v AC unit :-P

EXACTLY....the batteries take all the load and have plenty of reserve with 4 batteries. To prove my point I only use two batteries in my truck and don't have any issues with my Red Dot system, four batteries would double the available amp reserve so what are you guys worried about.

I have a Red Dot R-6100 with a metal cover. The compressor was easy to mount since there are mounts available for BC Cummins. The AC lines run down the back of the cab and underneath into the engine compartment.

I have a Red Dot AC unit on my 915. Straight forward install, mount the rooftop unit (had to cut a hole in the top of the cab) and mount the compressor to the engine. I used it the other day and it was 101 or so outside and the temp inside the truck was 76-78.