Hello everyone and Happy Holidays!

Attic ductwork is ubiquitous in extant, single floor, single family housing and we are all too aware of the numerous shortcomings. A number of years ago, I decided to address the issue of a single, central ceiling return in my 1750 sq. ft,, 2002 home (10' ceilings) and the subsequent problems with cold hardwood floors and interminable recovery from setback.

I won't review my crawl space encapsulation or the fact that I have limited setback to just one degree (it makes my wife happy to "force" heating upon our typical wake-up time), both of which have improved comfort at no measurable difference in heating cost. After reading Dr. Bailes recent tretis on HDD, I suspect savings would be difficult to estimate anyway. The home has been blower door tested (precise numbers escape me, but were excellent) and insulation heavied in the attic.

Back to that single, central ceiling return.

Being a rocket surgeon in my spare time, it occurred to me that pulling cooler air from floor level in the heating season could only help the previously described problems and I found a place in the corner of a hall closet, very near the central ceiling return, where I could install an 8" flex duct. Much larger, and the duct took more space than my wife would approve. At the bottom of the duct, I installed a 90* adapter with a section of 5" X 14" filter media.

In the closet ceiling, a suitably sized, very tight clearance hole permitted entrance of the flex into the attic, where the duct is connected to an adapter on the single, enormous flex duct that leads back to the furnace.

An appropriately sized grill on each side of the bottom of the closet door ensured air movement.

I appreciate overall return air has not increased, but my calibrated, wet finger indicates considerable air flow. Also, the added duct is closed during the cooling season.

My questions to the group are, what unintended consequences may I have introduced into my system and does anyone have any thoughts on potential cost savings? My DIY efforts came in at around $50 and two band-aids.

All the best.

Views: 295

Replies to This Discussion

Why use insulated flex if the return duct is in conditioned space? You could have used a 10" hard pipe, but you would have been limited by the 5x14 return anyway.

My house is similar, 10' ceilings, 1999 construction, 150sqft less, slab instead of crawl space. The house came with (2) 20x20 ceiling returns in the hallways which have 8' ceilings. Here's what I've done:
1: Replaced the standard 4 way residential registers with fully adjustable commercial registers. Helped tremendously as supply air can now be directed to the floor w/o blowing directly on us. Well worth the $20/ea they cost.

2: Downsized HVAC system. House came with 88k furnace and 3ton AC. Replaced with 44k furnace/2 ton AC. The long run cycles help a lot with better air mixing. With the old oversized furnace setting the blower speed on high helped with air mixing, but still wasn't as comfortable as downsizing the furnace.

RSS

Discussion Forum

REMRATE Modeling of 2 stage Heat Pumps - Including GSHP

Started by Jeremy Begley. Last reply by David Butler May 16, 2018. 1 Reply

Manual S for Water Furnace Equipment

Started by Jeremy Begley. Last reply by Danny Gough Mar 23, 2018. 6 Replies

joining ducts

Started by Don Fugler. Last reply by Dara Bowser Nov 28, 2017. 21 Replies

HVAC integration – the past, the present, and the future

Started by Igor Mitbarg. Last reply by Lucifer Prescott Apr 11, 2017. 1 Reply

Latest Activity

Daniel Baur-McGuire replied to Diane Chojnowski's discussion Check out the new Home Diagnosis TV Series on Public TV
"I've been waiting for this show to release! Corbett always is worth a watch. Check out his…"
11 hours ago
Profile IconMaria M Hernandez and Robert Corbyn joined Home Energy Pros Forum
13 hours ago
Diane Chojnowski posted a discussion

Home Diagnosis Episode 2: Environmental Sensitivity and Healthy Homes

Check this out! You can watch Episode 2 of Home Diagnosis on PBS or on YouTube.Episode 2 visits a…See More
14 hours ago
Diane Chojnowski replied to Diane Deyerler's discussion Energy OutWest 2020
"Hi Diane, This looks like a great event! Please post it on our event calendar and we'll share…"
14 hours ago
Robert Corbyn posted photos
14 hours ago
Milli Cater commented on Crosbey Archery's blog post Setting up Your HVAC for Fall Maintenance
"Life means many things, but besides taking care of your family, home and working, you should take…"
17 hours ago
Coby Rudolph commented on Jim Gunshinan's blog post What Are the Nation's Best Utility Energy Efficiency Programs?
"Interesting. Something needs to change when 30% of the exemplary programs (16 out of 53) saw…"
yesterday
Dimitri Mal joined Bob Krell's group
Thumbnail

Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon,…See More
yesterday

© 2019   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service