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

 

David Butler's Page

Latest Activity

David Butler replied to Jerry Needham's discussion Blower door test for small apartment building
"It depends on purpose of test. If it's not for program or code compliance, then testing the building as one unit makes sense. It eliminates the pesky adiabatic leakage that would occur if you tested each unit individually. If you're…"
Oct 6
David Butler replied to Randall Olsen's discussion How to measure room pressures
"Daniel wrote: "Any air not returning to the system from each room will be gained from elsewhere." Not necessarily. Notwithstanding combustion safety testing (which predates green building programs), zonal pressure testing is an important…"
Oct 1
David Butler replied to Randall Olsen's discussion How to measure room pressures
"Sean wrote: > never knew manufacturers would ramp down fan speed for fan only Two ways this happens: In fan-only mode (i.e., continuous fan), variable speed blowers typically operate at 50% of the selected speed setting. For multi-tap blower…"
Sep 30
David Butler replied to Randall Olsen's discussion How to measure room pressures
"Sean wrote: HVAC fan only not on heat or cool Hi Sean, do you know if that is specified anywhere? With many (most) newer systems, in fan-only mode,  the blower operates at a significantly lower speed than in heat or cool mode. Sorta defeats the…"
Sep 29
David Butler replied to Jan Green's discussion Mini split installation location
"I'm not sure if I'm making myself clear. You don't want to 'squeeze' the outdoor unit between the building and block wall. The installation manual will call out specific clearances for outdoor unit for rear, sides, front and…"
Sep 24
David Butler replied to Jan Green's discussion Mini split installation location
"Hi Jan, actually, I said you'd be find putting it on the west wall since you wanted a larger window. There's no need to set the outdoor unit on the same wall as the indoor unit. According to your drawing, the room (excluding closet and…"
Sep 24
David Butler replied to Jan Green's discussion Mini split installation location
"Hi Jan, in a room like that with a relatively balanced aspect ratio, flat ceiling and not much glass, the mini-split could probably be located on any wall. With the information provided, the west wall looks good, preferably near the center.  In…"
Sep 20
David Butler replied to Jan Green's discussion Mini split installation location
"Really hard to advise without knowing the layout. But you're asking good questions. Any chance you can post the floor plan or 'sketch and scan'?"
Sep 17
David Butler replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Among the various opinions expressed here, I offer a few 'truths'... Ceiling fans are mostly for cooling PEOPLE, not rooms. Evaporative cooling. Turn off the fan when the room is unoccupied.  Walter mentions another benefit: to help…"
Sep 17
David Butler replied to Benny Saroukhani's discussion Fresh air vent
"Luke wrote: > (ERV)  "...extract independently from bathrooms... allows you to eliminate energy wasting bathroom fans." It's not a good idea to rely on an ERV as primary exhaust for high-use bathrooms. By design, the ERV will…"
Aug 31
David Butler replied to Benny Saroukhani's discussion Fresh air vent
"It's certainly possibly to connect an HRV/ERV to a furnace or A/C duct system and make it work. The installation guide specifies a certain distance to space the connections from the blower to minimize interference, although the potential for…"
Aug 31
David Butler replied to Benny Saroukhani's discussion Fresh air vent
"Allow me to add to what's already been said. Typically I recommend an ERV or HRV for ventilation, depending on climate and other factors. Either will bring incoming air temperature closer to inside air, but the ERV also reduces moisture content…"
Aug 30
David Butler replied to Dav Camras's discussion Adding blown insulation to poorly installed batts?
"When topping off an existing ceiling with batts, there's a cost to pulling out the old. True, the blown-in may not fill in all the gaps, but you'd likely get more benefit by spending that money on additional blown-in on top. A more worthy…"
Aug 2
Eric Kjelshus replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"I have seen dry clay soil let gas though 2-4 blocks away - when wet clay seals the pipe then water gets into gas line.   Water trapped gas line and new home owner was thinking gas line was valved off but NO - clay dried out then the…"
Jul 12
Horace Douglas Hunt, Jr. replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"Prayers for their family. I sure hope it wasnt new appliance. If so, was the installer qualified to install?"
Jul 12
Todd Williams replied to David Butler's discussion another house explodes, killing 2 in apparent natural gas accident
"As a former HVAC contractor, the thought of a newly installed appliance killing people is nauseating. "
Jul 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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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

 
 
 

Forum Discussions

ENERGY STAR Version 3

Started by Allison A. Bailes III in General Forum. Last reply by Mandy Leazenby 8 hours ago. 10 Replies

Blower door test for small apartment building

Started by Jerry Needham in General Forum. Last reply by John White on Friday. 9 Replies

Radiant Barrier Southeast

Started by Gary Wright in Best Practices. Last reply by yassin chahdi on Thursday. 6 Replies

Latest Activity

Brett Little posted an event
Thumbnail

The Economics of Zero Energy Homes: Single Family Insights - Free CE Webinar at Webinar Online

October 24, 2018 from 12pm to 1:15pm
Zero-energy (ZE) and zero-energy ready (ZER) homes currently comprise less than 2% of single family…See More
2 hours ago
Mandy Leazenby replied to Allison A. Bailes III's discussion ENERGY STAR Version 3
"I've only ever worked on Energy Star with Habitat for Humanity.  But we have very few…"
8 hours ago
Colin Genge is now a member of Home Energy Pros Forum
9 hours ago
Brett Little posted a discussion

How to become a Certified GreenHome Professional - Free Webinar!

The Certified GreenHome Professional (CGHP) training is a way to learn about the basics of…See More
yesterday
Corbett Lunsford's video was featured

Testing Air Quality with Your Nose: Control Your HOMEChem

Charlie Weschler sits down with Grace and Corbett and gives fascinating examples of the complexity of indoor air chemistry. He is an air quality legend, a professor on three continents, and a super nice guy.
Friday
Profile Iconwallace van, Tony kroos and Sunmar Construction, Inc joined Home Energy Pros Forum
Friday
John White replied to Jerry Needham's discussion Blower door test for small apartment building
"Well, I think it completely depends on the purpose and requirement of the test. Testing one unit in…"
Friday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"I can use my Duct Blaster on any house that I expect to be less than 1300 CFM through the…"
Friday
Sean Lintow Sr replied to Jerry Needham's discussion Blower door test for small apartment building
"FYI, he is in Illinois where code is 5 (well up until March as noted when it drops to 4)  Heh…"
Friday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"Here are two pictures of the duct blaster fan as a blower door.  1 in a door and 1 in a…"
Thursday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"What standard are you testing to? Energy Star requires 5 ACH @ 50.   Code is 3.0 etc…"
Thursday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"What standard are you testing to? Energy Star requires 5 ACH @ 50.   Code is 3.0 etc…"
Thursday
Franco Oyuela replied to Allison A. Bailes III's discussion ENERGY STAR Version 3
"The ENERGY STARnew homes program has been around since the mid-1990s and is currently undergoing…"
Thursday
Blake Reid commented on Blake Reid's blog post Managing Mold & Humidity (in Hawaii)
"Thank you very much! They're actually the same, though - the one with the dehu cover photo has…"
Thursday
John Proctor commented on Blake Reid's blog post Managing Mold & Humidity (in Hawaii)
"Nice post -- much better than the one that only showed the dehumidifier."
Thursday
Brett Little updated an event
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Full Circle Urban Forestry: Introducing Urban Wood Opportunities - Free CE Webinar at Webinar Online

December 5, 2018 from 12pm to 1:15pm
Many common urban tree removal practices in the United States view felled urban trees as costly…See More
Thursday
Brett Little replied to Brett Little's discussion Virtual CEU Tour of the Pembroke Passive Solar Zero Energy Ready Home
"You know utilities are pretty complex, especially in IL, however it looks like just about 6.8 cents…"
Thursday
yassin chahdi replied to Gary Wright's discussion Radiant Barrier Southeast
"It’s hard to choose on of these as most of the time the reviews and buying guides found on…"
Thursday
Bruce Fillmore replied to Mark Furst's discussion Bath fan weirdness
"In my opinion venting into any soffit is a bad idea, it usually requires a sharp bend to get into…"
Thursday
Tray Biasiolli replied to Mark Furst's discussion Bath fan weirdness
"I'd agree with Sean - we get wind effects regularly when measuring ventilation fan intake at…"
Thursday

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