David Butler
  • Male
  • 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 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
David Butler replied to Mark Furst's discussion Tax Credit and the LTO test
"Although I'm not privy to the rationale for the 12% penalty (which almost certainly came from RESNET), I too think all those annual tax credit extenders, passed after-the-fact, is an example of politics at its worse. Rather than achieving their…"
Mar 9
David Butler replied to Jeremy Begley's discussion Manual S for Water Furnace Equipment in the group HVAC
"Hi Jeremy, manufacturer data is readily available for sizing ground source heat pumps. However, the procedure is different than for air source equipment since it involves the ground loop flow rate. Also, the procedure is different for water-to-air…"
Mar 8
David Butler replied to Jignesh's discussion Cost to replace a boiler for 210 units building
"Your question involves high-rise multifamily and thus is beyond the scope of this forum. In general, the size of the replacement boiler should be based on a proper load calculation which accounts for the building's exposed surface area,…"
Mar 6
David Butler replied to Pamela Brown's discussion Condensation on an interior wall of a detached garage.
"David N makes a good point as sub-slab moisture could be the culprit for Michigan garage described in the original post. But in that case, the moisture would have been obvious on the slab before condensing on the wall. @Pam, did the condensation…"
Mar 1
David Butler replied to Pamela Brown's discussion Condensation on an interior wall of a detached garage.
"Adding to what Sean said... although this could happen in any climate, I've never seen it. In addition to a quick transition from prolonged cold weather to mild, the moisture content in the air would also have to spike. A building can withstand…"
Feb 27
David Butler replied to Jignesh's discussion Efficiency of furnace
"Adding to Sean's comment... The reason a 90%+ furnace uses a PVC flue (as opposed to metal) is because the flue gas is cooler, compared to a conventional 80% furnace, which loses 20% up the flue. By design, higher efficiency furnaces extract…"
Feb 15
David Butler commented on Home Energy Magazine's blog post Andrew Scatizzi- Stick to the Basics in New Construction
"Given the location referenced in the article (southern Texas), I was surprised by what was not mentioned... windows!  In cooling dominated climates, glazing represents the largest load by far and it doesn't cost much if anything to shave…"
Feb 12
David Butler replied to Dennis's discussion Hoping to know more about the two-stage furnaces..
"Regarding filters... The primary purpose of a filter is to protect the blower and other furnace components, and secondarily, to improve indoor air quality. The least expensive type of filter is fiberglass mesh. It's also the least effective as…"
Feb 1

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

 
 
 

Latest Activity

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Zehnder Comfopipe vs. rigid pipe

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BRAND NEW: Fantastic Software for Retrotec

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Brett Little posted events
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Ben Thompson replied to Stuart Perkin's discussion TrueFlow in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hi Stephen. Do you still have a Trueflow that you would sell? Ben Thompson,…"
Friday
Ben Thompson added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
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Wanted: TrueFlow plate

Seeking an Energy Conservatory TrueFlow plate (grid) in good condition. Ben Thompson.…See More
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Scott Partlo replied to Jerry Needham's discussion Closed cell on roof deck to prevent mold.
"You say that 2" of closed cell foam is applied OVER the roof deck.  Where exactly was the…"
Friday
ayazfudugo1 replied to Tom Smith's discussion Are Energy Efficient Windows worth the investment?
"For both new and existing homes, Energy efficient windows are an important consideration Heat…"
Friday
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Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues…See More
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Todd Williams liked Diane Chojnowski's group Hall of Shame
Friday
Home Energy Magazine posted a blog post
Thursday
Leona Zoey posted a blog post

Landlords Are Your Friends

While it may be easy to forget given their apparent position of power over you, landlords usually…See More
Thursday
Ruben Martinez liked Diane Chojnowski's video
Thursday
Haley Keegan joined Building Performance Institute's group
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Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
Thursday
Donald Hester replied to Jerry Needham's discussion Closed cell on roof deck to prevent mold.
"For the roof shingle issue that is an unfortunate issue with many home inspectors that have been…"
Thursday

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