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  2. Is It Time for a Furnace Upgrade? 10 Warning Signs to ... - AOL

    www.aol.com/time-furnace-upgrade-10-warning...

    Depending on the problem and the age of the furnace, it may be more cost-effective to invest in a replacement furnace instead of making expensive repairs to an old system. 10. Visible Signs of ...

  3. 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.

  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. Low-Income Home Energy Assistance Program - Wikipedia

    en.wikipedia.org/wiki/Low-Income_Home_Energy...

    In total since 1976, weatherization assisted over 7 million low-income households, which received free home improvements worth an average of about $5,000. The most common measures were furnace replacement, attic and wall insulation, and infiltration reduction.

  6. Heating, ventilation, and air conditioning - Wikipedia

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

    For example, six air changes per hour means an amount of new air, equal to the volume of the space, is added every ten minutes. For human comfort, a minimum of four air changes per hour is typical, though warehouses might have only two. Too high of an air change rate may be uncomfortable, akin to a wind tunnel which has thousands of changes per ...

  7. Electric arc furnace - Wikipedia

    en.wikipedia.org/wiki/Electric_arc_furnace

    A typical steelmaking arc furnace is the source of steel for a mini-mill, which may make bars or strip product. Mini-mills can be sited relatively near the markets for steel products, so the transport requirements are less than for an integrated mill, which would commonly be sited near a harbor for better access to shipping.

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