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  1. #27
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,443
    Quote Originally Posted by jmon22 View Post
    I agree. House needs tightened up and I am going to be remedying that. Going with the 60k will give me a goal to shoot towards. If I have to put an extra blanket on during the coldest nights of the year in the meantime, then so be it.
    I wish more homeowners thought the same way.. I'd like to hear the results if you plan on putting the system in before it gets cold this winter.. Something tells me the system will keep up just fine, even before you tighten up the house. be sure to have the ductwork looked at, this is where leaks really hurt.

  2. #28
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,757
    Quote Originally Posted by dan sw fl View Post
    NICE tool ... really emphasizes the COMFORT impact of radiant temperature.
    When you consider that, I think it adds even greater credence to my argument SETBACK STRATEGY FAILS - The Case Against High Thermostat Setbacks:

    http://bit.ly/energyvanguardsetbacksucks

    jmon - for a reference point, this thermostat is in a 3300 sf home on a windy hill in Mendon NY. I think we may have a colder climate, or at least very similar to yours.

    The furnace is 3 stage - 60/45/24. Medium stage is 45,000 btu. 2f is below design temperature.


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    This indicates that a single stage 60 would have been 25% over sized. Does this help?
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  3. #29
    Join Date
    Jul 2012
    Posts
    32
    Wow Ted, that really does make me feel better. How tight is that house? Are the ducts and the design perfect?

  4. #30
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,443
    It's actually 33% oversized going from 45k to 60k. And that's colder than design conditions. Contractors really have issues with trusting the load calculations. My dad is due to replace his HVAC soon, house is 2,200ft in Oklahoma. I feel better about recommending the 45k to him after seeing your post, even though the existing furnaces is 125k. A/C will be going from a 4 ton down to 2.5 ton.

  5. #31
    Join Date
    Jul 2012
    Posts
    32
    Pros here say to trust the load calc, but I am guessing nothing you could run on that house would support that 45k. Would it?

  6. #32
    Join Date
    Jul 2009
    Location
    ohio
    Posts
    100
    just buy an 80 less to go wrong less upfront cost less down the road maintenance ..... oh nvm our overseers aren't gonna allow any more 80s to be installed
    read,learn,grow.....repeat.

  7. #33
    Join Date
    Jul 2008
    Location
    Rochester NY
    Posts
    4,757
    We got the house to 2000 cfm50. I think the load calc called for 70. Some panning was MISSING and zoning was added, so we sized smaller than load due to airflow concerns.

    Now if we don't get "undersized" warnings from the software we know we are too big. If anyone has experience with manual j not oversizing, please share the data, and buy a lottery ticket, and stay AWAY from lightening storms, and can I please ride your unicorn?

    I'm trying to match range, so a furnace that ranges from 20 to 60 offers huge versatility. The 3 ton 2 stage pump provides nice crossover options based upon rates, though with gas prices so low not sure there's reason to run the pump too low except maybe to avoid cycling furnace.
    Which makes more sense to you?
    CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
    ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%

    DO THE NUMBERS! Step on a HOMESCALE.
    What is comfort? Well, it AIN'T just TEMPERATURE!

    Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.

  8. #34
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,870

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