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 Rob Madden's discussion Where is the money in energy auditing / home rating?
"Ok, now I understand. I think that happens pretty much everywhere. But forgoing energy retrofits at resale doesn't affect code compliance. And in cases where the energy code would apply (i.e., a major renovation or addition), the…"
Jun 14
David Butler replied to Rob Madden's discussion Where is the money in energy auditing / home rating?
"@Eric, please elaborate re: "80-90% of realtor/loan closer will kill energy codes""
Jun 13
David Butler replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"@Dennis, without defending Big-8, I would point out that condensation (on duct surface) is a function of how well the vapor barrier (the outer layer) is sealed. This issue is exactly the same with conventional foil-faced fiberglass duct wrap. It,…"
May 20
David Butler replied to Danny Gough's discussion REALLY????
"Bradford wrote: >I do not see that amount of moisture on that size of coil as a problem, let alone a 3 SF residential coil with limited outside air. Probably not. But to Danny's point, a lot of folks in residential building science &…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"@Bradford, Danny is referring to residual moisture that remains adhered to the coil after the compressor cycles off. Due to adhesion, a meaningful amount of bulk water will remain on the coil rather than dripping off into the catch pan. Eventually,…"
May 16
David Butler replied to Danny Gough's discussion REALLY????
"Depending on loads and how the stat is managed, there's usually one extended off-cycle per day, long enough for coil to fully dry. But if you still want continuous blower (for other reasons), at least employ an air handler, stat, or 3rd party…"
May 12
David Butler replied to Danny Gough's discussion REALLY????
"Although I haven't personally measured coil moisture, it stands to reason that what you describe in your last paragraph may not be a small impact. Having looked at a lot of AC cycle graphs over the years, I would posit that the "off…"
May 12
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"You're preachin' to the choir. We had several in-depth discussions on this topic here, here, here, and here. Unfortunately, CO-Experts detector is no longer manufactured. I believe the ProTech 8505 is still available (see this site)."
Apr 5
David Butler replied to Daniel Baur-McGuire's discussion Need - Measuring and Tracking system for RH and Temps inside wall of New Home
"Another less expensive option without wi-fi capability is the Hobo monitor by Onset. Data retrieval requires physically connecting the Hobo to a PC (or tablet?) to upload the log files."
Apr 5
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"That's because those standards were written to protect municipalities (from nuisance alarms) rather than to protect the public =:-o"
Apr 5
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"@Brennan, design conditions used by ACCA Manuals J & N and various other design procedures are taken from tabular data published and updated regularly in ASHRAE's Fundamentals Handbook. Chapter 14 (2017 ed.), which contains the tabular…"
Mar 27
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Thanks for your thoughtful reply, Brennan. My point about the load impact on tight homes with right-sized equipment is only that the additional load in that case can be very large relative to equipment capacity (compared to a home that has a leaky…"
Mar 26
David Butler replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"@Brennan, there's virtually no lag. When an exhaust fan comes on, the pressure differential should reach stasis within a matter of seconds I would imagine. You wrote: " The tightness of the envelope shouldn't make these any better or…"
Mar 25
David Butler replied to Antoine Karam's discussion Residential airflow balancing
"Despite references to the term 'air balance', I was thinking this would be used by occupants to set rooms to different temperatures, in particular, to shut off rooms that are not in use. That's where you get into trouble, as that…"
Mar 7
David Butler replied to Antoine Karam's discussion Residential airflow balancing
"Hi Antoine, see this article at Energy Vanguard, especially my comments: https://bit.ly/2OLhv9y I can't tell much from the page you linked but I think the concerns I addressed in my comments would apply to the Cello product if the intended…"
Mar 7
David Butler replied to David Byrnes's discussion When can an oversized A/C be a good thing?
"Opps, I didn't notice the on-peak period (3PM to 8PM) doesn't change in winter. Scratch my comments about heat pump pain. In previous years dealing with advanced rate design, I've never seen anything like that before. I wouldn't…"
Mar 6

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

Tyson Pischel commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"Couple of thoughts. Building in the size range of 1,800-2,000 sq ft, we have one return in the main…"
4 hours ago
Profile IconChris Dowis, Tyson Pischel, Megan Tunon and 1 more joined Home Energy Pros Forum
5 hours ago
Walter Ahlgrim commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"I do not understand your sizing chart you say “22” return on a 5 ton AC unit” is…"
8 hours ago
Walter Ahlgrim commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"I do not understand your sizing chart you say “22” return on a 5 ton AC unit” is…"
8 hours ago
Building Performance Institute liked Diane Chojnowski's video
9 hours ago
Building Performance Institute liked Diane Chojnowski's video
9 hours ago
Jan Green commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"David:  Actually, over 70,000 moved to Phoenix last year alone.  We will be back up to…"
10 hours ago
Mark Furst commented on David Byrnes's blog post Why Phoenix Is Called "The Land Of No Return"
"Good stuff."
10 hours ago

© 2019   Created by Building Performance Association   Powered by

Badges  |  Report an Issue  |  Terms of Service