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2. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   Forced air heating is the type of central heating most commonly installed in North America. [1] It is much less common in Europe , where hydronic heating predominates, especially in the form of hot-water radiators.

3. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   A forced-air gas furnace, of the older, non-condensing type. Forced-air gas heating systems are used in central air heating/cooling systems for houses.

4. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   The second category of furnace is the forced-air having atmospheric burner style with a cast-iron or sectional steel heat exchanger. Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work.

5. Is your heater making you sick? How to avoid cold-like ...

   www.aol.com/lifestyle/heater-making-sick-avoid...

   The dry air produced by heating systems can irritate your nasal passages and throat, which can in turn cause discomfort, Lizarzaburu adds. Dry air can also make it harder to fight off colds.

6. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   In the past, water heating was more efficient for heating buildings and was the standard in the United States. Today, forced air systems can double for air conditioning and are more popular. Some benefits of forced air systems, which are now widely used in churches, schools, and high-end residences, are Better air conditioning effects

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The heat is distributed throughout the building, typically by forced-air through ductwork, by water circulating through pipes, or by steam fed through pipes. The most common method of heat generation involves the combustion of fossil fuel in a furnace or boiler .