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  1. Manual J Calculation? - HVAC-Talk

    Aug 9, 2007 · For load calculations they use the Manual J (either 7th edition or 8th edition (full or abridged). Thus you immediately have three different algorithms for “loads” being used by the …

  2. Manual J calculation and CFM - HVAC-Talk

    Aug 5, 2020 · Hi, I have a question about the results I have from a manual J calculation. The info about the house was input (room sizes, type of construction, insulation or lack there of, …

  3. Help with Manual J calculation - HVAC-Talk

    Jul 9, 2022 · Greetings, I am trying to perform a Manual-J calculation to ensure that my replacement a/c unit and furnace are properly sized. I used the Cool Calc software and …

  4. Questions Concerning Manual J Load Calculation For A...

    Mar 20, 2014 · I am attempting to perform a Manual J Load Calculation on a 1989 Fleetwood Double Wide Home. The home is 27 x 48 = 1296 square feet. I am fully aware that one of the …

  5. Manual J Calculation? - HVAC-Talk

    Aug 11, 2007 · For load calculations they use the Manual J (either 7th edition or 8th edition (full or abridged). Thus you immediately have three different algorithms for “loads” being used by the …

  6. Furnace 100k vs 80k BTU - HVAC-Talk

    Sep 20, 2021 · You can do either calculation yourself if you're willing to geek out and crunch some numbers. "Ballpark" manual J's still tend to oversize significantly in my experience working …

  7. Pitfalls of DIY CoolCalc Manual J calculation - HVAC-Talk

    Nov 13, 2018 · I'm having a home built now for my primary residence, and am almost at the dried-in stage. I've had a couple of quotes for the HVAC system, but both have sized based more on …

  8. What is a manual J load calculation? - HVAC-Talk

    Jun 4, 2011 · The manual J is required here to even get a permit here. Bare bones basic it is the calculation of the sq of the house, combined with the amount of window space of the house, …

  9. Manual J calculation vs. keeping a journal of actual cycle times

    Jul 7, 2024 · I'm curious which would be more helpful: Paying for a manual-J calculation or just keep a journal of actual cycles of the current system? Thoughts? A/cs could run 80-90% of the …

  10. Manual J and Manual S Calculations - HVAC-Talk

    Feb 9, 2016 · From what I understand (and it's not much) Manual S takes into account climate, air flow, and manufacturer design specifications. For example a Manual J calculation can show …