I installed a simple custom fan to go in the CR Laurence window vent. These made a huge difference and are powered by a separate electrical system. Three fans will go in the rear drivers side window for air flow exhaust and looking to add 3 on the door window for air input or another option. Still need to add my roof fan. Parts $50 -- 3 electric fans, 3 fan grills, metal mount for 3 fans, wires, on/off switch. Order parts from https://www.coolerguys.com/ Stay cool. Tim