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 11-21-2010, 02:05 AM   #31
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Share |
Default

Replace Heat Exchanger or Furnace


Quote:
Originally Posted by Home Air Direct View Post
I
As far as which furnace to choose? There is really no bad product on the market today. The reality is that a bad install will kill a great furnace.
You got that right...no truer words spoken. But furnaces are like any machine some are better made than others.

__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
The Following User Says Thank You to hvaclover For This Useful Post:
plummen (10-22-2013)
Old 11-30-2010, 11:00 PM   #32
Newbie
 
Join Date: Nov 2010
Posts: 1
Default

Replace Heat Exchanger or Furnace


the tires on my car are bald and the steel is showing but they still have air in them. I guess its still safe to drive. seriously.. no matter how big or how small a crack in a heat exchanger is its going to end up doing the same thing... leaking. The prices you stated are average. Stop playing around and be responsible. Replace the furnace.
hvac292 is offline   Reply With Quote
The Following User Says Thank You to hvac292 For This Useful Post:
plummen (10-22-2013)
Old 02-22-2012, 09:34 AM   #33
Newbie
 
Join Date: Feb 2012
Posts: 1
Default

Replace Heat Exchanger or Furnace


Visibly cracked heat exchanger, but no measurable CO levels. Here is a possible explanation.

This furnace appears to have an inducer fan, which draws combustion gases through the exchanger and puts the inside of the exchanger under a negative pressure. Typically these furnaces have the indoor blower upstream of the exchanger, which means the indoor air & heat exchanger exterior are under positive pressure. Both of these factors contribute to safety and a positive pressure differential between indoor air and combustion gases. In theory, any cracks or leaks will cause indoor air to leak into the heat exchanger rather than combustion products to leak to the indoor air stream. However, it may be possible these cracks can leak the wrong way, perhaps at startup when the burner can be on for a short time, but the indoor blower has not come on yet.

If cracked, I feel the exchanger or furnace should be replaced regardless of inherent safety. If it is 15-20 years old, I would recommend new. Other components will begin to fail and be costly. Glad to see you recognize there may be a long payback for higher efficiency models.

Last edited by HVAC/R Instr.; 02-22-2012 at 09:41 AM.
HVAC/R Instr. is offline   Reply With Quote
Old 02-22-2012, 10:10 AM   #34
HVAC Tech/Owner
 
Join Date: Nov 2010
Location: VA
Posts: 436
Default

Replace Heat Exchanger or Furnace


Two year old post......the OP is either dead or took the advice.......
Technow is offline   Reply With Quote
Old 02-22-2012, 01:14 PM   #35
REP
Member
 
Join Date: Jul 2011
Posts: 615
Default

Replace Heat Exchanger or Furnace


A couple of things hat I wonder about.
The first is this heat excghanger has not failed by poping the rings as many do,so I wonder why this exchanger failed.Could there be design problems with the duct??Could the gas pressure be too high coming from the gas valve??So what caused the cracks??
Now little cracks always turn into big cracks and they do this over time and they do this at night a lot because it gets colder at night and the furnace gets hotter the longer its on.If it has small cracks you should just be greatfull you knowe about it and can do something now before you or anybody in the house gets sick.
I noticed that there was a range of furnace sizes in your post.Each house has a size needed.What size does your house need??Now is the time to find out.
Any competant contractor can do a manual "J" AND a Manual "D" to zero in on the size and design of the ductwork needed for your house.
Figure it this way ; your money is valueable to the contractor.He needs your work to feed his family.Now if he is too lazy to do the manual "J" and the manual"D" and he is using short cuts to quote you,then what makes you think he won't take short cuts in installing your job??
Any mistakes made now will only cost you later on.Instead of just getting something done,Get it done right.
REP is offline   Reply With Quote
Old 01-22-2013, 08:59 PM   #36
Newbie
 
Join Date: Jul 2011
Posts: 1
Default

Replace Heat Exchanger or Furnace


Quote:
Originally Posted by beenthere View Post
As contractors. We charge what we need to stay in business, and to of course pay employees.

So, many of us are well over 85 bucks an hour.

Get some other estimates.
A one time price offer, is a good sign to call some one else.

Since your GMP seems to be over 20 years old.
Get quotes on other brands also.

A 95% may only work out as a 15% savings on paper.
But, most come out saving more then that(and yes, some less).

A new unit will come with at leat a 20 year HX warranty, and a 5 years parts warranty on the other furnace parts.

10 years from now, is your gas going to cost the same as it does today?
YES... as the price of gas will actually be less than when this post was written. The supplies of NG are enormous, and will be a much better deal per BTU than electricity.
Docrings is offline   Reply With Quote
Old 01-22-2013, 10:35 PM   #37
Member
 
Join Date: Jan 2010
Posts: 74
Default

Replace Heat Exchanger or Furnace


Quote:
Originally Posted by Technow View Post
Two year old post......the OP is either dead or took the advice.......
LOL, I was going to reply but then noticed the date. I guest you are right, the OP is either dead or took the advice. Let see if someone else reply

ROFL
Mr.HVAC is offline   Reply With Quote
Old 10-21-2013, 08:18 PM   #38
Newbie
 
Join Date: Oct 2013
Posts: 3
Default

Replace Heat Exchanger or Furnace


90 percent plus is the only way to go.You Will be paid back in $$$$$$$$$$$$$$$$$ savings in no time at all
poppyo is offline   Reply With Quote
Old 10-21-2013, 08:19 PM   #39
Newbie
 
Join Date: Oct 2013
Posts: 3
Default

Replace Heat Exchanger or Furnace


Replace the old 80 percenter......................................... ..............
poppyo is offline   Reply With Quote
Old 10-21-2013, 08:21 PM   #40
Newbie
 
Join Date: Oct 2013
Posts: 3
Default

Replace Heat Exchanger or Furnace


Get er done for about 4 Grand.............Fair Enough......................
poppyo is offline   Reply With Quote
Old 10-22-2013, 08:40 PM   #41
retired elect/hvac/plumb
 
plummen's Avatar
 
Join Date: Jan 2010
Location: south east of omaha/The island of misfit contractors
Posts: 2,895
Default

Replace Heat Exchanger or Furnace


Quote:
Originally Posted by jogr View Post
Call Goodman with the model # and serial #and see if your heat exchanger is under warranty. Mine was so I didn't have to pay for the part. However I did have to pay for the labor. If your heat exhanger is still under warranty (Goodman is lifetime) your contractor might not realize it so you might actually have to tell them (I had to tell mine).

Most HVAC companies would rather sell you a new furnace so you might need to call a few to find the best install price. But make sure you go with a reputable company - a low price isn't any good if it's done wrong.

You might not actually be able to buy a heat exchanger online unless you are a licensed HVAC contractor. I couldn't find anyplace online that would sell me the heat exchanger instead of a licensed contractor. Goodman would only allow a licensed HVAC dealer to receive the replacement exchanger under their warranty. If you do end up finding one you may find that local HVAC contractors won't want to touch it since they have no control over what you are giving them to install.

I ended up paying $650 labor for mine but I'm in a somewhat rural midwest area where cost of living is fairly low. The $1100 estimate might be very reasonable for your area. It really does cost a lot to run a business - much more than just paying an employee his hourly wage while he's at a customers house.

You want to make sure you replace a bad exchanger right away cause they can be deadly and make sure you have good carbon monoxide detectors.

Good luck
If its an 80% Im going to guess a 20 year warranty on it,some of the 90 plus units were lifetime.
I used to warranty out a ton of the old trane 80% heat exchangers for cracks,the trane wreck dealer in omaha used to hate me back in the day.
__________________
"facts" have no relevance to this discusion
Posting from a concrete bunker under a non descript barn
plummen is offline   Reply With Quote
Old 10-22-2013, 08:45 PM   #42
retired elect/hvac/plumb
 
plummen's Avatar
 
Join Date: Jan 2010
Location: south east of omaha/The island of misfit contractors
Posts: 2,895
Default

Replace Heat Exchanger or Furnace


Quote:
Originally Posted by poppyo View Post
90 percent plus is the only way to go.You Will be paid back in $$$$$$$$$$$$$$$$$ savings in no time at all
Theres nothing wrong with an 80% furnace,many times its not feasable to install a 90% in place of an existing 80.

__________________
"facts" have no relevance to this discusion
Posting from a concrete bunker under a non descript barn
plummen is offline   Reply With Quote
Reply

Tags
gmp125, heat exchanger


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
No heat from furnace. sofakingwyld HVAC 10 11-06-2010 06:24 AM
carrier/payne furnace heat exchanger issues gomongo1 HVAC 7 03-19-2009 08:06 PM
Problems with new furnace..Overheating, having to reset. Furnace too big? Tommy2 HVAC 41 12-01-2008 01:55 PM
Cracked Heat Exchanger SusanB. HVAC 12 10-14-2008 03:57 PM
Furnace blew up, need to replace heat and air with single unit. d_Random HVAC 2 02-06-2007 04:18 PM




Top of Page | View New Posts

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