BTU Deficiency

07-18-2010, 09:13 PM	#1
cannonman Newbie   Join Date: Jul 2010 Posts: 4	BTU Deficiency I had a Manual J performed on my house and it came up at exactly 48,000 BTUs. If I put in a system that is rated at 46,000 BTUs, should that be of any concern? Will the 2,000 BTU deficiency cause stress on the C/U? Thanks. Last edited by cannonman; 07-18-2010 at 09:34 PM.

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07-18-2010, 09:18 PM	#2
Scuba_Dave Xtreme DIY'r   Join Date: Jan 2009 Location: South of Boston, MA Posts: 17,248	BTU Deficiency Where are you located ?

07-18-2010, 09:26 PM	#3
Yoyizit It was a dark and stormy     Join Date: Jul 2008 Location: NW of D.C. Posts: 5,954	BTU Deficiency The odds are 48 KBTUH is oversized.

07-18-2010, 09:31 PM	#4
cannonman Newbie   Join Date: Jul 2010 Posts: 4	BTU Deficiency Quote: Originally Posted by Scuba_Dave Where are you located ? Hot & humid, humid & hot South Florida.

07-19-2010, 12:15 AM	#5
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,651	BTU Deficiency What was the sensible load, and what was the latent load.

07-19-2010, 12:23 AM	#6
cannonman Newbie   Join Date: Jul 2010 Posts: 4	BTU Deficiency Quote: Originally Posted by beenthere What was the sensible load, and what was the latent load. I couldn't tell you. I didn't do the calculations myself and I wasn't provided that data.

07-19-2010, 12:27 AM	#7
beenthere An old Tradesmen   Join Date: Oct 2008 Location: PA Posts: 18,651	BTU Deficiency Then we can't tell you how well or how bad a 46,000 BTU unit will be for your house. If you have a lot of air infiltration. It probably won't do very well. if, on the other hand, your house has little infiltration, it will probably do fine.

07-19-2010, 08:04 AM	#8
cannonman Newbie   Join Date: Jul 2010 Posts: 4	BTU Deficiency Quote: Originally Posted by beenthere Then we can't tell you how well or how bad a 46,000 BTU unit will be for your house. If you have a lot of air infiltration. It probably won't do very well. if, on the other hand, your house has little infiltration, it will probably do fine. I'll see if I can get that data today. Thanks, everyone.