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

Welcome Home Performance Forum Members! (formerly RESNET BPI - Energy Audit and Home Performance)

Started Nov 18, 2017 0 Replies

Last month the Home Performance Forum merged with Home Energy Pros, now under the Home Performance Coalition banner. Members of the Home Performance Forum who are not already Home Energy Pro members…Continue


David Butler's Page

Latest Activity

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
David Butler replied to Steve Eberly's discussion Humidity control in tight home
"The window glass / sash intersection is a weak point for condensation. Whether or not the walls (structure) are at risk depends on the ratio between exterior and cavity insulation. One thing you should mention to the homeowner is that window…"
Mar 26
David Butler replied to David Meiland's discussion Air-sealing 101 for new home builders who have failed their blower door tests
"@SeanL wrote: As for Sean Wiens piece - looks great if done pre drywall... I was curious about that too. One of the photos shows house with drywall taped & mudded. Seems like an aerosol sealant would leave a slight residue or build-up around the…"
Mar 24
David Butler replied to David Meiland's discussion Air-sealing 101 for new home builders who have failed their blower door tests
"Energy Star and Building America have some great resources for builders who want to learn how to air seal and reduce thermal bridging. I don't have any specific links for Building America, but here's a link to their Guides search engine.…"
Mar 24
David Butler replied to Jeremy Begley's discussion Manual S for Water Furnace Equipment in the group HVAC
"Danny wrote: "It is a bit of a juggling act bouncing back and forth between what ifs." Exactly. You're trying to solve a multi-variable problem where you have only limited control over some of the variables, depending on whether…"
Mar 21
David Butler replied to Brad Cook's discussion When is a fuel history confidential and why?
"I've been down this path before. Whether there's a legal basis or not, a dealer can refuse based on its own policies. Unless there's a law compelling disclosure. If the issue is truly 'not wanting to divulge fuel prices',…"
Mar 20
David Butler replied to Jeremy Begley's discussion Manual S for Water Furnace Equipment in the group HVAC
"Not being an Elite user, I can't help you configure their software for a water-to-air system. Unless an Elite user chimes in, your best bet would be to contact Elite or their main training guy John Walsh. Both numbers are at the top of this…"
Mar 20

Profile Information

Optimal Building Systems
Role in Home Performance Marketplace
Building energy modeler, Researcher (Lab. academia. etc.), Other
Professional Certification
Website URL
LinkedIn Profile

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!

Diane, HEP Moderator


Forum Discussions

Overheating garage

Started by Chris Bellanca in Best Practices 1 hour ago. 0 Replies

GSHP for domestic hot water

Started by David Holtzclaw in General Forum. Last reply by David Holtzclaw 4 hours ago. 3 Replies

Log home roof insulation

Started by Bob Reuther in Best Practices. Last reply by Daniel Baur-McGuire yesterday. 8 Replies

Latest Activity

Chris Bellanca posted a discussion

Overheating garage

Hi all, I'm looking for potential solutions to a problem at a client's house.  The south facing 2…See More
1 hour ago
Landon added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase

Brand new retrotec blower door system $3000

Hi, I’ve got a brand new blower door system from retrotec that I got 2 months ago, and never got…See More
1 hour ago
John Redmond posted discussions
1 hour ago
David Holtzclaw replied to David Holtzclaw's discussion GSHP for domestic hot water
"Thanks John & Bill. Bill your experience is one reason why I wanted a larger heat pump with…"
4 hours ago
John White posted photos
13 hours ago
Diane Chojnowski posted events
Rob commented on Bob Krell's group Healthy Indoors (IAQ)
"Hello, Has anyone tried custom filtering of window AC units? Specifically concerned with…"
Michael Dunseith's 2 photos were featured
Franco Oyuela commented on Perry Ning's blog post Warnings About Portable Air Conditioners
"Here are the top five benefits of owning a portable air conditioner: 1. Low Price – All…"
Daniel Baur-McGuire commented on Kurt Shafer's status
"Whole house fans are a scam if you use air conditioning. Seriously "
Daniel Baur-McGuire commented on Michael Dunseith's photo


"Looks fun. How did you connect all the fans together or did you adjust the flows manually? The…"
Daniel Baur-McGuire replied to Bob Reuther's discussion log home roof insulation
"I would look to stop air from penetrating the ceiling. I would guess hot air is able to rise…"
Jay Lillien posted a blog post

How Changing Temps Affect Your Home’s Windows

In Colorado, there’s a time-honored saying:“If you don’t like the weather, just wait a few minutes……See More
Matt Peiris replied to H.O. Electric's discussion Stop Drinking Bottled Water! in the group News & Announcements
"Cities like Los Angeles now use chlorine AND chloramine to treat their water. While chlorine can be…"
Matt Peiris joined Diane Chojnowski's group

News & Announcements

Share your news and announcements with the community in this group.To post news or an announcement,…See More
Michael Dunseith posted photos
Ron Jones added a discussion to the group Job Board

Residential Construction Superintendent for Net Zero Energy Homes: Northern California

At Acre Designs (acre.co), we're bringing Net Zero Energy homes into the 21st century, and we're…See More
Kim added a discussion to the group Job Board

Job Opening - New Construction Specialist - Philadelphia or Pittsburgh, PA Location

New Construction SpecialistAre you looking for a collaborative work environment, colleagues who are…See More
Profile IconSteve, Todd Crawford and Evangeline Spence joined Home Energy Pros Forum
Steve liked Alex Jonson's discussion Constant Airflow Regulator


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