Forums | Home Repair | Home Improvement | Painting | Interior Decorating | Remodeling | Landscaping


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 07-05-2012, 07:01 AM   #1
Newbie
 
Join Date: Jul 2012
Posts: 2
Share |
Default

Doing it right - Dehumidifier Sizing


Hi, I am fairly new around here. I'm going to post in the introductions shortly. However I joined at the moment because I need some advise on this subject.

I have a Victorian-era farmhouse. Its been added onto a couple of times over the years. I am in need of a dehumidifier. Our last one conked out after 7 years of service. I have decided that I'm going to do it right this time and spend the money on a good one instead of the crap they sell at Homer Desperate, Sears, etc. To make sure I go about this in the right way I've been trying to do some research with regard to sizing.

Given the age of the home, our duct work layout is not exactly what one might call modern. While we have return air "drops" from the first floor to the basement, the returns are not connected to the intake on the furnace. "Open returns" Ive heard this called. There isn't much that can be done about this due to the layout of the basement, ceiling height, placement of the furnace in relation to the return drops, etc. The basement itself is about 900 sq. ft. unfinished. The rest of the house is about another 2700 sq. ft. two stories.

So here's my question that I came here for: Since the furnace is essentially drawing ambient air from the basement do I need to get a dehumidifier that is designed to handle the entire 3600 sq. ft. of the house incl. the basement or can I get away with something smaller? This is pretty important because the price difference between between one that can handle the whole thing (Santa Fe Max Dry) and one just for the basement square footage (Santa Fe Compact 2) is nearly $1000. Or could I get away with something in between?

I sincerely appreciate any advice on this subject.
owen44138 is offline   Reply With Quote
Old 07-05-2012, 07:09 AM   #2
Member
 
Join Date: Jun 2012
Location: Augusta, GA
Posts: 369
Default

Doing it right - Dehumidifier Sizing


You'll need one for the entire space, including the basement. If your returns were connected directly to the furnace, then you could dehumidify only the top space, and that would very likely be a good thing to do. Trying to cool with very moist air is difficult at best, and you really should be returning air directly from the conditioned space, not the area where the furnace is installed. You mention that the basement is unfinished, so in many cases routing return ducts directly to the furnace is not terribly expensive.
scottmcd9999 is offline   Reply With Quote
Old 07-05-2012, 07:22 AM   #3
Newbie
 
Join Date: Jul 2012
Posts: 2
Default

Doing it right - Dehumidifier Sizing


Perhaps I should have been more clear about its intended use. Our dehumidifier has always lived in the basement. We generally don't have above moisture problems, just an occasional seep when we get super heavy rain, never really a mildew smell or anything. According to local history the house was moved in about 1915 but even so what can you expect for an almost 100 year old basement? Then too, my mom thinks its a good idea to run one in a basement anyway even if there's no musty smell.

Also we had our furnace replaced about 18 months ago. When the contractor was doing the install they said they could do direct routing for about another $2500 on top of the $4000 we paid for the furnace. We were hesitant not so much because of the price but because the contractor said the only efficient way to get from one of the return drops to the intake was to cross the ceiling right at the bottom of the stairs with 12 inch round which due to the ceiling height would have made the last two steps into the basement rather awkward.

Last edited by owen44138; 07-05-2012 at 07:32 AM.
owen44138 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
Sizing a dual shut off valve for a water line to fridge ericman Plumbing 10 08-19-2011 09:47 PM
Consumer Dehumidifier for 1000 sq ft encapsulated crawlspace? chazman113 HVAC 4 08-11-2011 08:57 AM
Humidifier and dehumidifier on furnace loadie HVAC 2 12-07-2008 03:16 PM
Can I do this w/a dehumidifier? famdog Plumbing 7 10-31-2008 09:53 AM
dehumidifier INSTEAD of crawl space vents DangerMouse Building & Construction 29 07-29-2008 12:55 PM




Top of Page | View New Posts

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