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  1. #1
    Join Date
    Jan 2007
    Location
    Joppa, MD
    Posts
    51

    Propane Question

    How do you feel about a heat pump with a propane backup for my house in MD? Has anyone converted. I am wondering if it saves money compared to a new high efficient heat pump. Just wanted to see if anyone notices a usage decrease.
    Lorax808

  2. #2
    Join Date
    Jun 2007
    Location
    The Twilight Zone
    Posts
    2,964
    Quote Originally Posted by lorax808 View Post
    How do you feel about a heat pump with a propane backup for my house in MD? Has anyone converted. I am wondering if it saves money compared to a new high efficient heat pump. Just wanted to see if anyone notices a usage decrease.
    I live in Harford County, MD.

    Propane is one of the most expensive heating fuels.

    What is your price for propane ($ per gallon)?

    Do you already have a propane tank for other appliances?

    What are you converting from?

  3. #3
    Join Date
    Jun 2007
    Location
    The Twilight Zone
    Posts
    2,964
    Compare the cost of 1 million btu's of heat for propane vs heat pump vs electric resistance.

    Heat pump w/electricity at 16 cents per kw-hr delivered, C.O.P. = 3.25 at 35F:
    (1,000,000 / 3414) x .16 / 3.25
    = $14.42

    Resistance electric heat w/same rate:
    = $46.86

    Propane at $2 per gallon, 90% efficient furnace:
    (1,000,000 / 91,000) x 2 / .9
    = $24.42.

    Insert your own costs and efficiencies for a more accurate cost comparison.

    In the above example, the heat pump is 40% cheaper than the propane furnace for the same 1 million btu's of heat. As the ambient temp increases from the 35F example, the C.O.P. increases, and the heat pump is even cheaper to run.

    The cost of a defrost cycle is not accounted for in the above.

    Take care.

  4. #4
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Quote Originally Posted by lorax808 View Post
    How do you feel about a heat pump with a propane backup for my house in MD?.
    Compared to what??? What do you have now???

    Propane is still cheaper than resistance heat in most cases for aux. heat below the balance point.

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