Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Search this Thread Display Modes
Old 10-16-2007, 09:06 PM   #1
Average Joe
Join Date: Aug 2006
Posts: 53
Rewards Points: 0
Share |

Determining Tonage

What is the formula for determining what size AC unit is needed? I know that there are many different factors, however I am just looking for a high level rule of thumb calculation. The home is a raised ranch in NJ, approximately 1750 Sq FT



Rze is offline   Reply With Quote
Old 10-17-2007, 10:39 AM   #2
Join Date: Aug 2007
Posts: 83
Rewards Points: 0

Determining Tonage

sq footage divided by 400 usually gets you close. In your case, you would probably need a 4 or 4.5 ton unit.

cjett is offline   Reply With Quote
Old 10-17-2007, 04:21 PM   #3
scotch on the rocks
hvactech's Avatar
Join Date: Mar 2007
Posts: 56
Rewards Points: 0

Determining Tonage

first, you must take into consideration the size of your furnace and ductwork, for every ton of refrigeration 400 CFM of air flow are needed, if the fan or the duct cant handle the CFM then you are going to have all sorts of problems with the new A/C, check the ductwork and furnace and dont go crazy over the top, bigger is not better, for a house like your I'd go with a 2.5 tons unit if the fan/duct allows for it.
hvactech is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Help determining header size Griffith.N Building & Construction 15 10-03-2007 04:40 PM
Determining drain pipe routing? tigerbalm2424 Plumbing 3 03-09-2007 08:12 AM
Determining if I have enough room cibula11 Electrical 24 02-04-2007 10:48 AM
Determining SQ Ft of my home??? Sellncars Building & Construction 2 09-03-2006 11:33 AM

Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.