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Old 01-05-2008, 03:10 PM   #1
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manual J

We had a manual J estimate done with one contractor who had an outrageous price for putting in a system. I subsequently called other contractors to put in similar systems (trane 14 seer dual fuel) and they all think I need more tonage. I live in the Memphis area and the first estimate called for 6.5 tons (with exceptional insulation) for a 4800 sq ft house / two story. Everyone down here wants to put in 1 ton for every 500 sq ft. Seems like an outdated rule of thumb to me. Any comments or help. Thanks

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Old 01-05-2008, 08:35 PM   #2
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manual J

The reason the guy with the Manual J was high is because he is planning on doing it right. The size of the unit is not somthing ot guess at. What else might be guessed at when installing the unit. Most systems are oversized and this will effect your comfort.

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Old 01-05-2008, 11:02 PM   #3
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manual J

thanks, I agree with you. I feel that most guys down here just go by the old rule of thumb and don't do any research. I just want a piece of mind when I buy this system. I feel like I'm not hiring a pro, just some guy who has been doing it because his dad or friend did it and taught him the basics. Maybe I'm wrong, but I don't know.
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Old 01-06-2008, 08:45 AM   #4
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manual J

Why not pick a brand of equipment you want and call their local rep. and have him reccommend a contractor.
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Old 01-07-2008, 10:37 AM   #5
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manual J

There are a few guys who offer Manual J load calculation service through here: Manual J

Good luck
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