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Old 07-11-2012, 12:21 AM   #1
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Manual J


Hello everybody. I was wondering if someone could tell me how to do a Manual J load calculation. I am in the process of remodeling a workshop and turning it into a rental apartment. I want to make sure that what I do is right. I have talked with a few older HVAC techs and a few younger ones. Some say do the manual J, some say just go with the sq footage. I dont know what im doing but I dont want some idiot coming in and two years from now I have to redo something. I thank you all for your help. If its just the square footage, its 1532 sq ft.

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Old 07-11-2012, 03:29 AM   #2
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Manual J


Manual J calculations, done correctly, are the best way to insure that you have adequate cooling and heating to meet the space requirements.

There are some online calculators. Here's one:

http://www.hvaccomputer.com/ggindex.asp

IMO if you're remodelling a workshop you need to consider the heat gain/loss of the shop, the usage patterns, machinery, number of people, etc etc - in other words, you couldn't really go by the standard rules of thumb (600 sft/ton residential, 400 commercial).

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Old 07-11-2012, 06:05 AM   #3
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Manual J


Quote:
Originally Posted by scottmcd9999 View Post
Manual J calculations, done correctly, are the best way to insure that you have adequate cooling and heating to meet the space requirements.

There are some online calculators. Here's one:

http://www.hvaccomputer.com/ggindex.asp

IMO if you're remodelling a workshop you need to consider the heat gain/loss of the shop, the usage patterns, machinery, number of people, etc etc - in other words, you couldn't really go by the standard rules of thumb (600 sft/ton residential, 400 commercial).

He's remoldeling it into an apartment.
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Old 07-11-2012, 06:58 AM   #4
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Manual J


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He's remoldeling it into an apartment.
Dratted coffee - didn't kick in quick enough for me to comprehend what I was reading!!
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Old 07-11-2012, 07:05 AM   #5
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Originally Posted by scottmcd9999 View Post
Dratted coffee - didn't kick in quick enough for me to comprehend what I was reading!!
I have that same problem some days. The link you posted though, should be what he needs.
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Old 07-11-2012, 12:56 PM   #6
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Manual J


Thank you for your quick replies. I checked out the website and im going to download it soon as the paycheck gets deposited. Funny how that works. Anyway would it be worth it to do a Manual D calculation as well? Also, this may be opening a can of worms, but would it be worth it to go ductless rather than ducted? I have seen some units with SEER ratings as high as 20-24 in the ductless, but about 17 is as high as ive seen with ducted? Any opinions?
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Old 07-11-2012, 01:00 PM   #7
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The ACCA website has a free manual D spread sheet you can download.

A good multi head/cassette duct less can cost as much as a central. Depends if you like seeing the cassette in almost ever room.

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