Propane heaters are a fairly cheap way to heat a small area, or take it away if you need to go to a source of heat. There are a number of different types of propane heaters to fit different needs.
Indoor propane heaters can be installed up to a house, and according to the current energy prices, could be significantly cheaper to operate than an electric heater. You're right, an exhaust system, whether the fuel is burned in the house, but also as a faninstalled to move the hot air.
But the really valuable application of this idea is in the portable propane heater. People find it too expensive to heat their entire house, all day, every day. Again, this is not useful if certain parts of the house, you tend to stay in most of the time want. If you are only at the top level of your home embroidery during the day, and tend to sleep during the night up, it makes no sense, the entire heatHouse all day. One solution people find for this approach is to use a portable heater in heavily trafficked areas and sealing the rest of the house. Otherwise, the warm air can be prevented from leaking and wasting, while reducing your heating costs significantly.
You can also use portable propane heaters outside the home, such as in the garage when you are working on a car in winter or on a lake when you're ice fishing. They are also ideal for camping or in aCabin.