Revolutionary RV A/C Technology. After 2 years of redesigning and reengineering one of the most popular and most imitated RV air conditioners, KINGCLIMA Ucooler4000pro – the stronger, quieter, lighter, smaller and more environmentally friendly RV air conditioner. The Ucooler4000pro uses its smart design, tighter specification allowances and improved materials to maximize air flow and performance. This newest RV A/C unit offers a 15% air flow increase and is 19% lighter than previous models.