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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   His system was also adapted for use by bakers in the heating of their ovens and in the making of paper from wood pulp. Franz San Galli , a Prussian-born Russian businessman living in St. Petersburg , invented the radiator between 1855 and 1857, which was a major step in the final shaping of modern central heating.

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. Furnace (central heating) - Wikipedia

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

   In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [ 1 ]

5. O'Keefe and Merritt - Wikipedia

   en.wikipedia.org/wiki/O'Keefe_and_Merritt

   The large Aristocrat model featured three ovens and two broilers, weighing 734 pounds. [4] In 1960, a built-in barbecue unit could be added to a cooktop. [8] By 1964, all O'Keefe and Merritt electric ovens had built-in clocks that could be used to turn on the oven, cook for a certain time, and then turn off the oven. [9]

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7. Home improvement - Wikipedia

   en.wikipedia.org/wiki/Home_improvement

   The concept of home improvement, home renovation or remodeling is the process of renovating, making improvements or making additions to one's home. [1] Home improvement can consist of projects that upgrade an existing home interior (such as electrical and plumbing), exterior (masonry, concrete, siding, roofing) or other improvements to the property (i.e. garden work or garage maintenance ...