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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. 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.

4. Bottom-blown oxygen converter - Wikipedia

   en.wikipedia.org/wiki/Bottom-blown_oxygen_converter

   To enable this, Sumitomo decided in 1990 to upgrade the refinery, and as part of that upgrade, installed a 3.5 t-capacity BBOC to replace its reverberatory doré furnace in October 1992. [19] Sumitomo reported that, while the old oil-fired reverberatory furnace had served it well for many years, it had the following drawbacks:

5. 12 Household Items You Should Replace Regularly and How Much ...

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6. 13 Household Things That Cost Less To Replace Than Fix

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   13 Household Things That Cost Less To Replace Than Fix. Daniel Bukszpan. January 19, 2025 at 6:00 AM. ... as the costs associated with such an effort will exceed the roughly $20 price tag of a new ...

7. 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.