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  1. #14
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,060
    Need an accurate heat gain/loss calc with the planned improvements and see what the heat loss is. Figure the smallest gas furnace is 40,000 BTU input, 32,000 BTU output. If you end up with a heat loss of 15-20,000 BTU, that's 5 to 7.5 kw electric. That's not much!

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,880
    There is no ARI Acclimate match up, that would derate a 3 ton, to another brands 1.5 ton.
    Even in first stage it would be more capacity then your load calc came out to.
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    How many times must one fix something before it is fixed?

  3. #16
    Join Date
    Apr 2008
    Posts
    4
    Quote Originally Posted by BaldLoonie View Post
    Need an accurate heat gain/loss calc with the planned improvements and see what the heat loss is. Figure the smallest gas furnace is 40,000 BTU input, 32,000 BTU output. If you end up with a heat loss of 15-20,000 BTU, that's 5 to 7.5 kw electric. That's not much!
    Hmmm...are you saying the manual J calculations from contractor #1 and the HVAC software (link above) I purchased is not enough? All contractors have been told that we are going back with new Marvin low-e windows, new energy efficient doors and 2lb foam sprayed insulation (3 inches on south & north facing exterior and 2 inches on east-west party walls) on the block/brick construction.

    So if it is just 15-20,000 BTU then you're confirming what the EarthCraft people said which is a heat coil would work just fine?

    I suspected what beenthere said about no system derating a 3 down to a 1.5.

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