Numerous companies provide air conditioning systems that can be added to all RVs, including Winnebago's. Built-in systems are manufactured by companies such as Coleman, Carrier and Duo Therm, while portable units made by LG, Sunpentown and Honeywell are lower cost models that require no installation.
Portable RV air conditioners require no installation because they are simply plugged into an appropriate electrical outlet and positioned for cooling as desired. Rooftop models can be professionally installed or done by an individual. Step by step instructions are available at websites such as DoItYourself.com. With self installation, proper electrical safety, unit location and good sealing to prevent leaks are primary concerns.