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  1. #1
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    9,727
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    Smile PRIMER on Dual Fuel Heating and Cooling Systems

    EPRI (Electric Power Research Institute) offers a concise (639 Kb) six-page Primer on Dual Fuel Heating and Coooling Systems.

    You may find this PDF attachment a convenient resource.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    25,680
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    Interesting article.

    Thank You Dan

  3. #3
    Join Date
    Jan 2009
    Location
    SE Iowa
    Posts
    5,577
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    That about sums it all up pretty well. It's the reason I'm looking at a dual fuel set-up to replace a 20 year old A/C unit and 14 year old furnace.

    I have one question on this topic. With a dual fuel system, should you size the heat pump for the cooling load or the heating load? I'm on the border of zone 2 & 3. I think with a heat pump sized for my cooling load, I would be able to reach the economical balance point before the thermal balance point. My house is too small to make a 2 stage heat pump economical. I'm hoping I can at least afford an Infinity 80% Furnace. A 90% unit isn't economical for a dual fuel set-up with my size house.
    I'm still waiting on a couple quotes to get a better feel for pricing form the local HVAC contractors. I wish they could just give me an equipment price list, then I can pick the most economical solution myself. I ran 18 different combinations of furnaces A/C Heat Pumps between Carrier and Trane and some of the premium systems might be economical, but I'm taking WAG's at the pricing.

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