David Butler
  • Male
  • Huachuca City, AZ
  • United States
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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 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
David Butler replied to David Byrnes's discussion When can an oversized A/C be a good thing?
"@Gamaliel, thanks for the info as I wasn't following APS's most recent rate filing (I live in a different part of the state). I see that the peak energy charge for the non-demand rate plan is 23 cents in winter and 24 cents in summer!…"
Mar 4
David Butler replied to Steve Nations's discussion high rise humidity
"@Franco, you apparently didn't bother to read the original post or any of the replies. The first two sentences from original post: "I have a friend/client with dry conditions in his condo. He's on the top floor of a 17-story…"
Feb 25
David Butler replied to Steve Nations's discussion high rise humidity
"Yes, you should be able to measure differences in RH, especially at the supply, as Sean said. But keep in mind that RH is not the same as absolute humidity, which is what the humidifier is affecting. RH, as I'm sure you know, is dependent on…"
Feb 22
David Butler replied to Steve Nations's discussion high rise humidity
"@Steve, I concur with Sean's comments. Your client is just throwing money out the window trying to humidify a space with leakage that high. I recall a client who had installed four steam humidifiers, yet experienced high 20's to low…"
Feb 22
David Butler replied to Alan Lehman's discussion Ducted mini split vs ceiling cassettes?
"@Alan, I'm confused... three comments: a) Why would sound transmission be an issue for the air handler, which is located indoors? Presumably you meant the outdoor unit regarding 60db zoning regulation? The specified outdoor unit (which I…"
Feb 21
David Butler replied to Alan Lehman's discussion Ducted mini split vs ceiling cassettes?
"Hello Alan, I normally advise against multiple ductless heads (per room) due to the higher cost and difficulty servicing smaller rooms. However, in your case, the additional cost would be more than offset by eliminating the basement. If it were my…"
Feb 20
David Butler replied to David Byrnes's discussion When can an oversized A/C be a good thing?
"David, please explain your comment: "...utilities are squeezing homeowners to play the demand/ peak hours game" As an aside... Earlier in my career (1980's) I had the opportunity to work on advanced load control projects, including a…"
Feb 9

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

Water heater ventilation question

Started by Luis Hernandez in General Forum. Last reply by Luis Hernandez yesterday. 11 Replies

Exterior green cladding

Started by Luis Hernandez in General Forum. Last reply by Dennis Heidner Apr 19. 3 Replies

Faces & Places of HPC19

Started by Diane Chojnowski in General Forum Apr 5. 0 Replies

high rise humidity

Started by Steve Nations in HVAC. Last reply by Dennis Heidner Apr 3. 7 Replies

Follow the action at #HPC19

Started by Diane Chojnowski in General Forum Apr 2. 0 Replies

Unvented Roof Assembly

Started by Patrick Michaelyan in General Forum. Last reply by Wallacebastien Mar 30. 6 Replies

Technology and Customer Service

Started by Kelly Caplenas in General Forum. Last reply by Franco Oyuela Mar 25. 1 Reply

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