Table of Contents show RV Air Leaks How to heat an RV without propane? You can use portable heaters and passive heating. There are also several other ways to easily heat an RV without propane. Even if you continue to use your RV’s propane heater, the following tips can help reduce your need for propane this winter. First, let’s cover a few logical steps that won’t cost you any money. Staying warm inside your RV is similar to staying warm inside your house. Remember, this is camping.