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 11-12-2007, 08:07 PM   #1
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

sizing the unit


I have received two quotes to upgrade my units and change the ducks. They sound expensive, but if they do the job I may proceed. (About $16,000). My problem is one installer said I need a 3 1/2 ton unit for cooling, and a carrier MV BO80 80,000 BTU 96% efficiency heater. The other guy said I must have a 4 ton Trane Air unit and a 120,000 Tran BTU heater (95% efficiency) . Both would be a zone unit, one is two zone the other is three zone. The house is only two stories, and is only 2000 square ft. The windows and house are well insullated and I have skylights upstairs.

I live in the Atlanta Ga. area.

This is a big difference, expecially in the heater IE: 80,000 or 120,000 BTU.

whose wrong? whose right?

any help is appreciated.

Lee

fhammette is offline   Reply With Quote
Old 11-12-2007, 10:20 PM   #2
no loose ends
 
Join Date: Nov 2007
Location: Southern California
Posts: 39
Rewards Points: 25
Default

sizing the unit


Quote:
Originally Posted by fhammette View Post
I have received two quotes to upgrade my units and change the ducks. They sound expensive, but if they do the job I may proceed. (About $16,000). My problem is one installer said I need a 3 1/2 ton unit for cooling, and a carrier MV BO80 80,000 BTU 96% efficiency heater. The other guy said I must have a 4 ton Trane Air unit and a 120,000 Tran BTU heater (95% efficiency) . Both would be a zone unit, one is two zone the other is three zone. The house is only two stories, and is only 2000 square ft. The windows and house are well insullated and I have skylights upstairs.

I live in the Atlanta Ga. area.

This is a big difference, expecially in the heater IE: 80,000 or 120,000 BTU.

whose wrong? whose right?

any help is appreciated.

Lee
I didn't know system pricing was so high in the east. I'm moving!
Ask your estimators to provide a 'load calculation'. If niether can, find one who will. I worked for someone that deliberately oversized the equipment so he could charge more--maybe the case, maybe not. The cooling difference isn't that bad--a half ton? But the heating seems pretty extreme.

undone is offline   Reply With Quote
Old 11-14-2007, 10:31 AM   #3
Member
 
Join Date: Apr 2007
Location: 'burbs of Detroit, MI
Posts: 467
Rewards Points: 250
Default

sizing the unit


Not to go on a tangent, but what exactly are you having done? That pricing seems extreme for such basic units. You're in GA, so personally, I'd go the 80k btu route. Now if you were here in Michigan with an unisulated house like mine, different story all together. I just had a 70kbtu 95% unit and 2 ton A/C installed with new duct work for about 1/4 of that. Now granted, the ducts were very simple bc you have complete access from the unfinished upstairs, but wow. But if you've got the money and dont care, its not going to hurt me either.
moneymgmt is offline   Reply With Quote
Old 11-14-2007, 02:51 PM   #4
hvac/refrigeration
 
Join Date: Oct 2007
Location: Ga.
Posts: 13
Rewards Points: 10
Default

sizing the unit


I am a contractor in the northern Atlanta area and the 3.5ton with 80,000 is about right. 120,000 is way overkill , as far as the 3.5 vs. 4 ton would be a factor depending on the house. Price is high but this also has to be taken into consideration of the install. I Would try another contractor or 2!
metal-maniac is offline   Reply With Quote
Old 11-15-2007, 07:11 AM   #5
Newbie
 
Join Date: Nov 2007
Posts: 4
Rewards Points: 10
Default

sizing the unit


good advise from all, which I will follow. I will have a load calculation done, and also get another quote or two to be sure the price is reasonable. Thanks to you all.
fhammette is offline   Reply With Quote
Old 11-16-2007, 09:24 AM   #6
Newbie
 
Join Date: Nov 2007
Posts: 6
Rewards Points: 10
Default

sizing the unit


I agree with everyone about load calculation first. Price is NOT too high for all new ductwork, make them show you how they will size and seal it. 80,000 is a large furnace for VA never mind GA! Dual fuel is the ONLY way to fly in our part of the country(unless you go geo....) its usually only 1000 to 1500 more and will save you about 2/3 of your gas bill...

VAheatcool 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
New A/C unit won't cool in hot temps wishiknewmore HVAC 39 06-28-2012 08:51 PM
Improper A/C sizing - Responsibility to Fix? Dragon HVAC 14 07-05-2007 01:35 PM
Furnace sizing opinions moneymgmt HVAC 2 05-29-2007 12:26 PM
Used Central Air Unit? shep28 HVAC 2 04-21-2007 07:59 PM
Need to expand existing concrete pad for A/C unit miketegra Building & Construction 2 07-03-2005 10:27 PM




Top of Page | View New Posts

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