Jul 10, 2022 · 2. Airxcel 08-0212 Mach Polar Cub. The Airxcel 08-0212 Mach Polar Cub is a sleekly designed RV air conditioner that could very well present itself as the air conditioner of choice when it comes to cooling small RV interiors. It is highly efficient and has a cooling and heating capacity of 9,200.