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

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-01-2011, 09:19 AM   #1
Newbie
 
Join Date: Aug 2011
Location: oklahoma city
Posts: 2
Share |
Default

air duct temp


what temp should I find coming out the ducts for a effecient system?

pbriggs is offline   Reply With Quote
Old 08-01-2011, 09:36 AM   #2
Member
 
Join Date: Oct 2010
Posts: 275
Default

air duct temp


It depends on the input air temp, usually in the range of 50-60F right after the evap coil. 3 or 4 degrees higher at the vent.

clocert is offline   Reply With Quote
The Following User Says Thank You to clocert For This Useful Post:
pbriggs (08-01-2011)
Old 08-01-2011, 09:54 AM   #3
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,626
Default

air duct temp


18F lower then the return at the furnace
biggles is offline   Reply With Quote
The Following User Says Thank You to biggles For This Useful Post:
pbriggs (08-01-2011)
Old 08-01-2011, 10:44 AM   #4
Newbie
 
Join Date: Aug 2011
Location: oklahoma city
Posts: 2
Default

air duct temp


I am getting 60 degree air from my farthest air duct.

I think that is pretty good in 100 + weather here

I keep clean filters in it and wash the condenser out every 2 weeks or so
so I think I'm doing pretty good

keep the thermostat at 79 daytime and 85 at night with the ceiling fans going I do ok sleeping

Last edited by pbriggs; 08-01-2011 at 10:49 AM.
pbriggs is offline   Reply With Quote
Old 08-01-2011, 01:04 PM   #5
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,023
Default

air duct temp


I am getting 44 from the supply, and 56 from the return. Then again, my house stays around 72 to 73 during Summer.
gregzoll is offline   Reply With Quote
The Following User Says Thank You to gregzoll For This Useful Post:
pbriggs (08-01-2011)
Old 08-02-2011, 06:03 AM   #6
Member
 
Join Date: Jun 2011
Posts: 72
Default

air duct temp


Quote:
Originally Posted by clocert View Post
It depends on the input air temp, usually in the range of 50-60F right after the evap coil. 3 or 4 degrees higher at the vent.
The temperatures with my A/C are nearly the same. I have a digital thermometer installed just above the evaporator and the temperature is 21-23F lower than return air. I happened to measure the vent temperatures last weekend and also found about a 3 degree increase at the vents near the end of the duct system; about 40-50 feet from the air handler.

David
Jessidog is offline   Reply With Quote
Old 08-02-2011, 06:37 AM   #7
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,626
Default

air duct temp


44F is banging with a good return keep in mind the stat is monitoring the return air with stat over return grill...the air out of the furnace needs to discharge out of those registers so even eyeballing the run on that supply and sealing it up the slightest leak helps... keeping the sun off the sills floor and walls stops extra loading back to the unit and longer run times.working the stat with ceiling fans is the best combo you can actually push the stat temp up in the hotter the outside goes....100F outside you don't need 70F stat setting try 75-78
biggles is offline   Reply With Quote
Old 08-02-2011, 07:29 AM   #8
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,023
Default

air duct temp


biggles, if I was to set my thermostat at 74 to 75, the house would be uncomfortable, that is why we keep around 72 to 73 when home during the day.
gregzoll is offline   Reply With Quote
Old 08-02-2011, 09:17 AM   #9
Member
 
JJboy's Avatar
 
Join Date: Oct 2010
Location: Austin - Texas
Posts: 1,402
Default

air duct temp


Quote:
Originally Posted by gregzoll View Post
I am getting 44 from the supply, and 56 from the return. Then again, my house stays around 72 to 73 during Summer.

Delta T = 12......Do you live in North Pole?

I'd like to see Beenthere explain this phenomenon
__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
JJboy is offline   Reply With Quote
Old 08-02-2011, 09:58 AM   #10
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,023
Default

air duct temp


Nope JJBoy, in the Midwest. The wife likes it around 70 at night, 72 during the day. Winter she likes it 60 at night, and 68 during the day and evenings. There is no insulation in our walls, so a lot has to do with compensating for a very old home. And yes there was a Manual J done when the system was installed.
gregzoll is offline   Reply With Quote
Old 08-02-2011, 10:15 AM   #11
Member
 
JJboy's Avatar
 
Join Date: Oct 2010
Location: Austin - Texas
Posts: 1,402
Default

air duct temp


AC performance is great. I just want to understand.
__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
JJboy is offline   Reply With Quote
Old 08-02-2011, 11:03 AM   #12
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,023
Default

air duct temp


All that I care, is that it works. My guy knows his stuff. It stays around 49-53 percent humidity during the Summer, and runs like a charm. Even on the hottest days, it never short cycles, and keeps a constant 70-73. The basement stays around 68 during the Summer, and 62 during the Winter.
gregzoll is offline   Reply With Quote
Old 08-02-2011, 11:17 AM   #13
Member
 
JJboy's Avatar
 
Join Date: Oct 2010
Location: Austin - Texas
Posts: 1,402
Default

air duct temp


Quote:
Originally Posted by gregzoll View Post
All that I care, is that it works. My guy knows his stuff. It stays around 49-53 percent humidity during the Summer, and runs like a charm. Even on the hottest days, it never short cycles, and keeps a constant 70-73. The basement stays around 68 during the Summer, and 62 during the Winter.
Delta T=12......It's same thing I say the smart car does 0-100 in 5s
__________________

**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.
JJboy is offline   Reply With Quote
Old 08-02-2011, 11:24 AM   #14
Experienced
 
Jackofall1's Avatar
 
Join Date: Dec 2010
Location: Southern Michigan
Posts: 2,822
Default

air duct temp


Quote:
Originally Posted by JJboy View Post
Delta T=12......It's same thing I say the smart car does 0-100 in 5s
What they don't do that, darn and I was about to buy one
__________________
When its all said and done there is usually more said than done
Jackofall1 is offline   Reply With Quote
Old 08-02-2011, 11:25 AM   #15
Retired from the grind
 
gregzoll's Avatar
 
Join Date: Dec 2006
Location: Midwest - Central Illinois
Posts: 14,023
Default

air duct temp


Quote:
Originally Posted by JJboy View Post
Delta T=12......It's same thing I say the smart car does 0-100 in 5s
Only way a Smart car would do that, is if you threw it off of a cliff, or out of a plane. The supply & return may be off of a degree or two, but when I have measured it, it comes out around 44 +/- 2 degrees at the supply, and 56 +/- 2 degrees, depending on whether we have the thermostat set at 71 or 72 during the day or evening. One of the requirements was due to my wife's allergies, and asthma, and the other was due to the electronics and the dog being comfortable when we are at work. It is bad enough, we had to get a mini-van, so the dog would have the third seat to herself when we go to the Upper Peninsula of Wisconsin to visit my wife's dad.

gregzoll is offline   Reply With Quote
Reply


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
?an Insulated Flexible Duct - half attached and half unattached ? tran Roofing/Siding 2 06-21-2012 06:25 PM
My Duct Sealing Project Cakemeister HVAC 6 06-13-2011 11:45 AM
Planning on New duct work..any feedback... kilosos2 HVAC 28 01-26-2011 09:21 AM
Metal duct or flex? smokey982 HVAC 6 08-06-2010 06:20 AM
Condensation in Wall: Can I Seal a Dryer Duct With Caulk? xquercus HVAC 5 07-01-2007 02:33 PM




Top of Page | View New Posts

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