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Heating systems may be classified as central or local. Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air, all in a central location such as a furnace room in a home or a mechanical room in a large building. The image to the right shows that simply using a cooks meat thermometer can help you determine temperature variations between registers throughout your home. This particular home showed a 40 degree temperature difference from furnace to the upstairs of the home. The reason for the difference is because the builder installed the ductwork on exterior walls where they are exposed to outside temperatures. The homeowner is considering re-installing the ductwork into interior walls.