David Butler
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  • Huachuca City, AZ
  • United States
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David Butler's Discussions

RESNET gets serious about modeling platform consistency

Started Jan 12 0 Replies

A critical element in ensuring the consistency of HERS Ratings is enhancing the consistency which RESNET accredited HERS Software Programs calculate the HERS Index Score. There are currently…Continue

Belgium’s Lavish Energy Use Sheds Light on More Than Just Its Roads

Started this discussion. Last reply by Don Hynek Dec 18, 2017. 1 Reply

As an avid amateur astronomer, the mitigation of light pollution is one of my passions, notably dovetailing with my professional passion for efficient design. The most efficient outdoor lighting…Continue

Beginners Guide: Managing Subscriptions on Home Energy Pros

Started this discussion. Last reply by Diane Chojnowski Nov 21, 2017. 2 Replies

New members may find subscriptions a bit confusing at first. I know I did. As you'd expect, when you create a new discussion or post a comment, you're automatically subscribed to comment…Continue

 

David Butler's Page

Latest Activity

David Butler replied to Dav Camras's discussion Adding blown insulation to poorly installed batts?
"When topping off an existing ceiling with batts, there's a cost to pulling out the old. True, the blown-in may not fill in all the gaps, but you'd likely get more benefit by spending that money on additional blown-in on top. A more worthy…"
Aug 2
Eric Kjelshus replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"I have seen dry clay soil let gas though 2-4 blocks away - when wet clay seals the pipe then water gets into gas line.   Water trapped gas line and new home owner was thinking gas line was valved off but NO - clay dried out then the…"
Jul 12
Horace Douglas Hunt, Jr. replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"Prayers for their family. I sure hope it wasnt new appliance. If so, was the installer qualified to install?"
Jul 12
Todd Williams replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"As a former HVAC contractor, the thought of a newly installed appliance killing people is nauseating. "
Jul 9
David Butler posted a discussion

another house explodes, killing 2 in apparent natural gas accident

2 dead in house blast, no foul play suspectedExcerpts from the article:"A house exploded in New Jersey early Saturday, killing a husband and wife and reducing the two-story home to piles of scattered rubble...."The blast initially reported as a gas explosion shattered windows in nearby homes..."Neighbors said the Paladinos had a new stove delivered on Friday,…See More
Jul 8
David Butler replied to Chris Bellanca's discussion Overheating garage
"Easy... insulate the attic ceiling. I'm not sure how much good it would do to air seal a garage ceiling, especially if walls are typical uninsulated but it would be relatively inexpensive to air seal the ceiling before insulation goes in. Also,…"
Jun 21
David Butler replied to Jerry Needham's discussion CONDENSATION ON CEILING AND WALLS OF MASTER BR
"Is it the cathedral ceiling that's sweating? Is the condensation on or adjacent to supply vents?"
May 31
David Butler replied to Gary Hall's discussion HERS score with HRV
"@Gary, the HERS score is intended to reflect projected energy consumption, and since ventilation by definition adds to energy consumption (due to increased heating & cooling loads), it follows that adding ventilation should negatively impact the…"
May 18
David Butler replied to Jeremy Begley's discussion REMRATE Modeling of 2 stage Heat Pumps - Including GSHP in the group HVAC
"Jeremy, I don't have the latest version so there may be a new input I'm not familiar with. If you're talking about the Load Served (%) field on the Mechanical Equipment Properties Summary form, that refers to the breakdown between…"
May 16
David Butler replied to Gary Wright's discussion Radiant Barrier Southeast
"If no ducts in attic, I can't imagine any rationale for installing RB. If the objective is to reduce ceiling (cooling) loads, fix the ceilings."
May 4
David Butler replied to Gary Wright's discussion Radiant Barrier Southeast
"In new construction, I used to specify TechShield OSB for roof sheating, which adds about 10 cents per sq.ft. of roof (may no longer be accurate). A large study of Energy Star homes in Houston included homes with ducts in the attic, sealed to Energy…"
May 3
David Butler replied to Andy Wahl's discussion Fire Rated High Performance Doors
"ThermaTru makes attractive fire rated doors that have a decent u-value (0.15 IIRC). Keep in mind that the delta-T will be relatively small so there's no reason to pay for something crazy efficient in that location."
Apr 27
David Butler replied to Jenna Bader's discussion Green Building Tips for a School Bus RV Conversion Project
"I agree with Sean that closed cell spray foam is the way to go. Closed cell gives you R6 to R7 per inch, compared to about half that for open cell and fibrous insulation. Also, open cell is vapor permeable and you need at least 3 inches get an…"
Apr 27
David Butler replied to Alan Lehman's discussion Zehnder Comfopipe vs. rigid pipe
"@Alan, I see you're located coastal California so there's no chance for any condensation on any supply runs inside the thermal envelope, so uninsulated metal pipe is fine for all house side ducts -- supply and exhaust. Brennan's…"
Apr 26
David Butler replied to John C. Semmelhack's discussion ACCA: Call for Volunteers to Aid the Development of a New Design Manual for Low-Load Homes
"It's about damn time."
Apr 16
David Butler replied to Steve Eberly's discussion Humidity control in tight home
"Excellent post, Brad. Your comment about master bedroom setback is an example of a topic every high performance practitioner should discuss with clients. I love to sleep in a cool bedroom at night... I even open the window in the dead of winter if…"
Mar 29

Profile Information

Company
Optimal Building Systems
Role in Home Performance Marketplace
Building energy modeler, Researcher (Lab. academia. etc.), Other
Professional Certification
Other
Website URL
http://optimalbuilding.com
LinkedIn Profile
https://www.linkedin.com/in/davidbutler52/

Comment Wall (1 comment)

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At 9:43am on November 1, 2011, Diane Chojnowski said…

Hi David,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

Forum Discussions

VERY TIGHT HOME WITH OVER SIZED AC

Started by Jerry Needham in BPI. Last reply by Dave Taylor on Thursday. 6 Replies

Mini split air conditioners and ceiling fans

Started by Beverly Lerch in General Forum. Last reply by Daniel Baur-McGuire on Monday. 4 Replies

DIY Filter Solution for an Evaporative Cooler, anyone?

Started by Leslie Jackson in HVAC. Last reply by Daniel Baur-McGuire on Monday. 6 Replies

Apply now for the Jon Siemen Memorial Scholarship!

Started by Diane Chojnowski in General Forum. Last reply by Quinn Korzeniecki Aug 9. 1 Reply

Latest Activity

Brett Little posted an event
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Green Rater LEED Credential Online Training at Online

September 5, 2018 at 12pm to September 6, 2018 at 5pm
With over 450,000 LEED® for Homes™ spaces worldwide, LEED is the international rating system to…See More
9 hours ago
Michael Schettine commented on Michael Schettine's video
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AccuFrame Water Test

"The Like button doesn't work on this site..."
20 hours ago
Franco Oyuela commented on Mike Muras's blog post "Practical Standards to Measure HVAC System Performance" Rob "Doc" Falke 04/17/2006
"It's important to evaluate and inspect a system regularly to make sure it's at optimal…"
yesterday
Seventhwave posted an event

HVAC technology enhancements for energy conservation at The Marq

October 4, 2018 from 8:30am to 4pm
Join us to learn how to get the largest energy savings in your commercial buildings. HVAC as a…See More
yesterday
Peter Krych replied to Dav Camras's discussion Adding blown insulation to poorly installed batts?
"I agree, it is wasteful to remove and dump old insulation. I still does its job. Air sealing is…"
yesterday
Michael Schettine commented on Michael Schettine's video
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AccuFrame Water Test

"With the conversion rate that- air is 800 time LESS dense than water at sea-level…"
yesterday
Michael Schettine posted a video

AccuFrame Water Test

In this short video, water is used to visualize air leakage sites that are present in the majority of framed walls in the US. New regulations require better ...
yesterday
Sam Feder liked Dav Camras's discussion Adding blown insulation to poorly installed batts?
Thursday
Chris Stratton liked Don Fugler's discussion Choosing a range hood
Thursday
Dave Taylor replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"Jerry, you should look at Buildingscience.com" High Mass Walls" 105 paper for more…"
Thursday
Jill Lindman's 3 events were featured
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Jill Lindman posted events
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Diane Chojnowski posted videos
Thursday
Don Fugler replied to Don Fugler's discussion Choosing a range hood in the group Kitchen Ventilation
"Has anyone installed a range hood in an older home with the ducting down to the basement and out…"
Thursday
Profile IconEileen Kraus-Dobratz, VENI MITTAL and Mark A McCrumb joined Home Energy Pros Forum
Thursday
Brian Robinson replied to Dav Camras's discussion Adding blown insulation to poorly installed batts?
"YES, YES, & YES!!! Bat droppings, mouse droppings, dead mice, nuts, seeds, acorns, lack of…"
Wednesday
Matt Peterson posted a blog post

The Importance of keeping Professionally Trained Gas Line Installation Technicians happy and loving their jobs!

Our company is very much a family to us, we strive to bring in and develop great people into great…See More
Wednesday
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yanky fogel liked Home Energy Magazine's video
Tuesday
Franco Oyuela commented on Shawn Weeks's blog post How Homeowners Can Keep Electricity Costs Down in Summer Months
"Cutting back on air conditioning is also good for the environment because it reduces carbon…"
Tuesday

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