It doesn't matter if you're a seasoned traveler or you just bought your first RV, replacing or upgrading an RV HVAC system can be overwhelming. Between BTU ratings, refrigerant changes, and thermostats that look identical but are actually completely different, replacements and upgrades are often more complicated than a simple swap. 

Whether you're replacing a rooftop unit, confused about compatibility, or just trying to understand RV HVAC systems better, this guide is here to help. 

Follow the links below for beginner-friendly explanations on a variety of topics. 

How RV Air Conditioners Work

Learn about the different components involved in an RV HVAC system

Choosing the Right BTU Size

Understand cooling capacity, general sizing recommendations, and factors that affect cooling requirements. 

Ducted vs Non-Ducted Systems

Learn how airflow is distributed and identify which system your RV has.

Single Zone vs Multi-Zone 

Understand the different ways to control the temperature inside your RV. 

Heat Pumps vs Heat Strips

Compare supplemental heating options and learn which one is best for your system. 

Understanding Compatibility

Learn what to check before replacing any system component. 

Noise Levels & Comfort

Explore variable-speed compressors, cycling behavior, and other comfort-related features. 

Generator & Power Requirements

Understand startup surge and other factors that affect generator compatibility. 

Common RV HVAC Buying Mistakes

Avoid common compatibility, sizing, and installation issues. 

Sometimes, but not always. The rooftop unit must be compatible with all other system components. Compatibility can depend on refrigerant type, connector type and wiring, and functions supported by the control box and thermostat. 

Learn more: Understanding Compatibility

The industry standard is a 14" x 14" roof opening, so almost all rooftop units will be designed with this in mind. However, compatibility also depends on roof thickness and other system components. 

Learn more: Understanding Compatibility

For many people, yes. Heat pumps can help reduce costs by lowering propane usage, and may be sufficient as a standalone heat source in especially mild temperatures. 

Learn more: Heat Pumps vs Heat Strips

Modern RV HVAC systems have updated communication protocols between components, along with more features and functionality options. There's a good chance that a thermostat designed to work with an older system will not be compatible with newer components, including the rooftop unit. 

Learn more: Understanding Compatibility

RV size is only one factor. Climate, insulation quality, ceiling height, and the number of occupants all affect your cooling needs. 

Learn more: Choosing the Right BTU Size

Yes, as long as the generator is capable of handling the startup surge of the rooftop unit along with all other appliances that will be running simultaneously. 

Learn more: Generator and Power Requirements