Many gas thermostats can be converted to run on propane, so thermostats that work with furnaces and boilers can also work with propane. Since propane is generally bottled, it is commonly used on portable heating devices and wall units with built-in thermostats.
Newer thermostats are often able to handle a range of heating options. Since natural gas and propane furnaces and boilers are so similar, thermostats that work on natural gas heating units typically work on propane units as well. However, homeowners switching from natural gas to propane with programmable thermostats may need to adjust their scheduling, as converted units sometimes warm homes at different rates, and longer run cycles lead to better efficiency.