We only work with brands that we trust. Dometic Roof Air Conditioners and Coleman Roof Air Conditioners have been used on RVs since the beginning. Both brands have specifically engineered their air conditioners to withstand the elements. If you are looking to replace or upgrade your existing A/C unit on your RV, we encourage you to do so with the brand that is currently on your RV. At times, the interior shroud can be reused on the new upper unit to save you the extra costs.