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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The energy cost of heating is one of the main costs of operating a building in a cold climate. Some central heating plants can switch fuels for reasons of economy and convenience; for example, a home owner may install a wood-fired furnace with electrical backup for occasional unattended operation.

3. International Comfort Products - Wikipedia

   en.wikipedia.org/wiki/International_Comfort_Products

   The KeepRite brand has been a major brand in Canada for 50 years. High efficiency oil furnaces, produced exclusively at the Quebec plant, carry the Lincoln name. Day & Night began as a solar water heater company in 1909 in Monrovia, California, providing Californians with round-the-clock hot water. It ventured into space heating in 1930s.

4. Heating, ventilation, and air conditioning - Wikipedia

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

   The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.

5. 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.

6. Direct Energy - Wikipedia

   en.wikipedia.org/wiki/Direct_Energy

   It also can perform energy retrofits and other energy management projects at larger facilities. Direct Energy’s Home and Business Services division employs over 1,400 technicians providing residential customers with heating, ventilation and air conditioner (HVAC), plumbing, home improvements, water heater and electrical appliance services. [19]

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