David Butler
  • Male
  • Huachuca City, AZ
  • United States
Share on Facebook Share

David Butler's Friends

  • Jerry Needham

David Butler's Discussions

Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)

Started this discussion. Last reply by David Butler Jan 2. 5 Replies

My new home, currently under construction, has a full basement, half of which will remain unfinished, i.e., no drywall or ceilings. We intend to use that area for storage. My specs call for 2"…Continue

RESNET gets serious about modeling platform consistency

Started Jan 12, 2018 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

 

David Butler's Page

Latest Activity

David Butler replied to Ed Minch's discussion Solar performance anomaly
"@Daniel, Ed said he has a revenue grade SREC meter, which presumably is the one he's using for  his calculations (right, Ed?).  A revenue grade meter is necessarily on the output side of the inverter, so it would already reflect the…"
Wednesday
David Butler replied to Ed Minch's discussion Solar performance anomaly
"Indeed, I'm not surprised you're already up to speed on how this works. But the size of your discrepancy instilled a wee bit of doubt. You wrote: "The array website tells me two things - my actual usage, and the amount the array has…"
Oct 14
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Eric, excellent point. Keeping those coils clean is paramount to both short and long term system performance!  But I think multiple cleanings per year by a professional (I see you're a mechanical contractor) is a bit excessive for most…"
Oct 14
David Butler replied to Ed Minch's discussion Solar performance anomaly
"Hi Ed, one possibility is a calibration issue with the inverter meter, but that seems highly unlikely with such a large discrepancy. I've had several clients describe the exact same problem and it always turns out to be a misunderstanding as to…"
Oct 11
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"@Walt, I hesitate to respond since this is rather off-topic, but my previous comment apparently wasn't clear. My rebuttal was directed at your comment that a "...heat pump works much harder on the coldest days."  That's not…"
Oct 3
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Walter wrote: "In truth my heat pump works much harder on the coldest days." This is a common misconception. The magnitude of the outside-inside delta-T has no bearing on the amount of work done by a heat pump over a given period of time.…"
Oct 1
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"The best way to create a positive pressure without imposing an energy penalty is with a simple supply fan. Although it's tempting to want to use a recovery ventilator to mitigate the energy loss, keep in mind that the amount of heat it can…"
Sep 30
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"@Ben, you definitely don't want to use an exhaust-only system to remove radon from a home's interior, since the negative pressure could (likely would) pull more radon into the home!  So if your intent is to use ventilation to mitigate…"
Sep 30
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"It appears the confusion is on my part (semantics). In my mind, a slab in of itself is not a foundation. The foundation consists of your footings and/or thickened portions of the slab, and basement wall to the extent that it's load-bearing. So…"
Sep 29
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"So now I'm confused. If the house has a full basement, what foundation are you referring to? Is your basement not built on a slab? I've heard of basements built on wood foundations, but I've never actually encountered one!"
Sep 28
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"Hi Ben, you ask a complex question that depends on other factors beyond the information you provided. Has the house been blower-door tested? If not, do you have a sense of how leaky/tight it is? A reading of 6.5 in a tight house is very different…"
Sep 28
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"I think you took my 'hottest day' comment a bit too literally. In any case, there's no doubt that certain failure modes are more likely as outside temperatures climb (more stress on components). And yes, a heat pump is nothing more…"
Sep 27
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Julie, as a point of clarification, in cooling mode a heat pump is essentially an air conditioner, and there's nothing new about A/C failures tied to high heat days. Everyone knows that air conditioners always seem to fail on the hottest day…"
Sep 26
David Butler replied to John Lile's discussion Air Sealing Manufactured Home
"Notwithstanding the typical low budget for these homes, it seems like encapsulating the crawl might actually cost less in some cases."
Sep 19
David Butler replied to Green Energy of San Antonio's discussion Does Radiant Barrier Still Work 10 Years Later?
"Since you posted promotional content in a discussion forum, let's have some discussion.... Your web page claims your radiant barrier saves up to 35% on energy bills. That claim defies logic, since A/C typically represents less than 35% of…"
Sep 11
David Butler replied to David Wentling's discussion ERV recommendations
"Thanks, Luke. I agree it wouldn't make sense to design an ERV to accommodate high interior moisture loads. I think the simplest strategy for that is to not rely on an ERV to exhaust excess interior moisture, as they're not designed for…"
Sep 5

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)

You need to be a member of Home Energy Pros Forum to add comments!

Join Home Energy Pros Forum

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

Building Performance Association's blog post was featured
1 hour ago
Building Performance Institute's blog post was featured

Jon Siemen Memorial Scholarship 2020 - Applications Due November 30th

Applications for the Jon Siemen Memorial Scholarship are due by Saturday, November 30, 2019. The…See More
1 hour ago
Profile IconVictoria Santiago and Robin Davis joined Home Energy Pros Forum
1 hour ago
Leslie Jackson liked Larry Weingarten's blog post Hot Water Heaven
Saturday
Emily Ambrose posted a blog post

Advanced Landing Pages: Why Going the Extra Mile Matters

Growing up, whenever guests were expected for dinner or a long weekend visit, my mother would spend…See More
Friday
Brett Little's video was featured

Intro to All Electric Multifamily Housing Design

Come learn from the most experienced zero-carbon multi-family designer in North America, Sean Armstrong of Redwood Energy, as he discusses heat pump hot tubs...
Friday
Brett Little posted videos
Friday
Brett Little posted events
Friday
Mia Rubinstein liked Brett Little's event Viewpoints to Downsize: Living Large In A Small House - FREE CE Webinar
Thursday
Profile IconErnest V F Hodgson, Gary Fuchs and Morts Online joined Home Energy Pros Forum
Thursday
Mike Rutkowski replied to Diane Chojnowski's discussion Presentation slides from the 2019 Building Science Summer Camp
"Cannot Open."
Thursday
Kent Browning replied to Tom Smith's discussion Are Energy Efficient Windows worth the investment?
"As others have said - replacement windows are helpful for comfort but don't expect them to…"
Thursday

© 2019   Created by Building Performance Association   Powered by

Badges  |  Report an Issue  |  Terms of Service