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 11-08-2010, 10:42 AM   #1
Newbie
 
Join Date: Nov 2010
Posts: 1
Share |
Default

Furnace too big?


About 6 years ago, I bought a new house. As part of the renovating process, I had a Home Depot contractor put in a new furnace in which also allowed central air conditioning to flow through the same vents. For a little over 5 years both A/C and heat seemed to work just fine but then at the end of last winter, the furnace started blowing nothing but cold air. At the time it was not a major concern as winter was pretty much over. When Fall came around, we had another heating contractor examine the furnace. This guy immediately pointed out that the furnace was too big our house. He went ahead and replaced the filter and did whatever he needed to do to get the furnace generating heat to the house again. 2 weeks later, the problem was back. The guy comes back and now says in order to fix the problem, they'll need to redo all the duct work because basically they can't handle the oversized furnace. Obviously, that route will not be cheap but I'm puzzled at frustrated at what to do. It just doesn't make sense to me that something that worked for 5 years would be the result of it being the wrong one for my house. Any input or advice would be greatly appreciated

Seasider is offline   Reply With Quote
Old 11-08-2010, 11:49 AM   #2
Master General ReEngineer
 
Bondo's Avatar
 
Join Date: Dec 2007
Location: Chaumont River, Ny.
Posts: 3,683
Default

Furnace too big?


Quote:
It just doesn't make sense to me that something that worked for 5 years would be the result of it being the wrong one for my house.
Ayuh,... I agree,... I'd call a different contractor for a 2nd opinion...
Or rather, a contractor that can Fix the furnace, instead of just replacing it...

Bondo is offline   Reply With Quote
Old 11-08-2010, 01:59 PM   #3
Member
 
Join Date: Aug 2009
Location: Illinois
Posts: 206
Default

Furnace too big?


Why not call back the original contractor? Shouldn't this be under warranty?
TJ_in_IL is offline   Reply With Quote
Old 11-08-2010, 02:34 PM   #4
fabrk8r
 
fabrk8r's Avatar
 
Join Date: Feb 2010
Location: Iowa
Posts: 849
Default

Furnace too big?


First, have someone do a "manual J" calculation to see if your furnace is truly oversized.

Replacing all the duct isn't going to solve the problem of the furnace being oversized. I would find a tech who can get the furnace repaired and then check the temperature rise when the unit is running again to make sure you don't need to modify the duct to keep from cracking the heat exchanger, having the furnace shut off on high limit or to reduce excessive air noise from having duct that's too small.

I wouldn't replace all the duct if it isn't necessary because then when you do install the correctly sized furnace in 15 years your duct will be the wrong size.
__________________
"The physician can bury his mistakes, but the architect can only advise his clients to plant vines." -- Frank Lloyd Wright
fabrk8r 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
Lennox Furnace G27M Series Unreliable operation: pressure switch or else? sheppard1977 HVAC 7 01-14-2013 05:42 PM
Water Inside/Around American Standard Furnace michrob HVAC 8 12-08-2011 03:51 PM
Furnace air filtration advice stephen_smith HVAC 7 12-24-2010 02:24 AM
Problems with new furnace..Overheating, having to reset. Furnace too big? Tommy2 HVAC 41 12-01-2008 01:55 PM
New Cased Coil - Install to Furnace - PICTURES!! hartkem HVAC 39 11-18-2008 01:45 AM




Top of Page | View New Posts

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