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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. Heating, ventilation, and air conditioning - Wikipedia

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

    Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

  5. Furnace (central heating) - Wikipedia

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

    A single-stage furnace has only one stage of operation, it is either on or off. This means that it is relatively noisy, always running at the highest speed, and always pumping out the hottest air at the highest velocity. One of the benefits to a single-stage furnace is typically the cost for installation.

  6. List of preserved historic blast furnaces - Wikipedia

    en.wikipedia.org/wiki/List_of_preserved_historic...

    The furnace remained in use until the 19th century and now forms part of the Ironbridge Gorge Museum Trust's Museum of Iron. IGMT: Madeley Wood or Bedlam: Two blast furnaces standing beside the road near river Severn, built in 1756 by Madeley Wood Company, and taken over by the Coalbrookdale Company in 1776. Further furnaces were built in the ...

  7. Hazardous waste - Wikipedia

    en.wikipedia.org/wiki/Hazardous_waste

    The ash and gases leftover from incineration can also be hazardous. Metals are not destroyed, and can either remain in the furnace or convert to gas and join the gas emissions. The ash needs to be stored in a hazardous waste landfill, although it takes less space than the original waste. [8]