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

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    6. Continuously Cycles On and Off. Generally, a furnace activates when the thermostat detects that the home's temperature has dropped below the set point, running until it reaches the desired ...

  3. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.

  4. Furnace (central heating) - Wikipedia

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

    The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

  5. Thermal cutoff - Wikipedia

    en.wikipedia.org/wiki/Thermal_cutoff

    Another type of thermal switch is a PTC (Positive Temperature Coefficient) thermistor; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the current through the circuit. When used in conjunction with a thermistor relay, the PTC will switch off an electrical system at a desired temperature.

  6. Staged combustion - Wikipedia

    en.wikipedia.org/wiki/Staged_combustion

    The technique involves shutting off the fuel flow from one burner or more to create fuel-rich and fuel-lean zones, achieving some NO x emission control (10%). The technique is not widely used in pulverized coal-fired plants (2 units, 350 MW e). Another method of fuel staged combustion is fuel biasing.

  7. Fix problems reading or receiving AOL Mail

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    If possible, ask the sender to resend the message to see if you can get the message a second time. Check for emails in your Spam folder. If you find emails in your Spam folder that don't belong there, you'll need to mark the messages as "not spam." 1. Sign in to AOL Mail. 2. Click the Spam folder. 3. Select the message that isn't spam. 4.

  8. Video shows terrifying rockslide in Colorado that forced ...

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    A major rockslide prompted two highways to be shut down in Colorado over the weekend and witnesses captured the frightening moment on video. ... You can get TurboTax for 30% off on Amazon today. AOL.

  9. Billionaire entrepreneur and top adviser to President-elect Donald Trump, Elon Musk, touted that he has reaped the benefits of a controversial class of weight-loss drugs, after fellow top Trump ...

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