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  1. #1
    Join Date
    Jul 2005
    Posts
    37
    Is there any way for a homeowner to figgure out what the electrical usage of the blower on a furnace is? Are you better off running the fan continuously in the winter? Should I use the "Intermitten Fan" setting on my thermostat? This is on a new single stage furnace.

    Thanks!

  2. #2
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    amp draw on the motor multiplied by 120 (volts)= kilowatts.
    multiply Kilowatts by whatever your electrical rate per kilowatt is.
    "Go big or Go Home"

  3. #3
    Originally posted by Black Adder
    amp draw on the motor multiplied by 120 (volts)= watts.
    divide watts by 1000 for kilowatts.

    multiply Kilowatts by whatever your electrical rate per kilowatt is.
    FIXT

  4. #4
    Yep...

    A (amps) x V (volts) = W (watts) / 1000 = KW (kilowatts)

    Then take your KW cost x the above figure. This will provide you with an hourly cost.

  5. #5
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    my ex complained of "cold" air blowing when burner was off --
    I tried to run fan all time when living up north to keep air stirred

    amp draw = actual reading for greatest accuracy --

    probably not worth figuring -- 0.745 watts = 1hp. fan motor is probably 0.3hp -- so at $0.1/kwh, you will spend a dime ea 3 hr.

    but, then you would need to clock how long the blower runs in "auto" mode & subtract that value to get the added cost.

    harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!

  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,752
    Originally posted by jultzya
    Yep...

    A (amps) x V (volts) = W (watts) / 1000 = KW (kilowatts)

    Then take your KW cost x the above figure. This will provide you with an hourly cost.
    Are you suggesting a HO take an amp draw on his blower.


    BTW, thats KWH, not KW.
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  7. #7
    Join Date
    Dec 2005
    Posts
    1

    Question

    I have a home owner want to put glass windows to his porch hi like to run supplied grills to it from the main trunk ? can i do it do i have to run a return back to the furnace, or what will be a better idea .

  8. #8
    Join Date
    Apr 2005
    Location
    illinois
    Posts
    257
    I seem to recall that static pressure makes a difference on how much power is used with a PSC motor. Paradoxically the higher the static the less power is used but the less air is moved. Is that correct?

  9. #9
    Join Date
    Apr 2004
    Posts
    7,680
    during the winter months, when its cold, the furnace will be runnning pretty regularly unless its drasticly oversized. (in which there is no fix). I dont see running the fan constently as being any benifit unless you are using some sort of high end filtering system or are overcoming a poor distribution system (ducts).

  10. #10
    Join Date
    Oct 2005
    Posts
    88
    Some of the replies were to multiply the nameplate amps for the motor by 120 to get watts. Ok in a pinch but will tend to overestimate the cost - a motor won't always draw its nameplate amps. A PSC motor on one of its lower speed taps will draw somewhat less. An ECM motor can draw a lot less.

  11. #11
    Originally posted by beenthere
    Are you suggesting a HO take an amp draw on his blower.
    Nope, just giving him the formula to be able to figure out the operating cost. He can either use the furnace info (for an estimated cost) or get the actual amperage from the tech when the next PM is done.

  12. #12
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,752
    Took ya all day to think of that answer huh. LOL...
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  13. #13
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,763
    Originally posted by redcell
    Are you better off running the fan continuously in the winter?

    only if blower goes to a very low speed when calling for fan only. blower running at normal cooling speed when burners are off makes for a very cool draft.

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