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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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

Chris Davis posted a blog post
5 minutes ago
Scott Katznelson replied to Jerry Needham's discussion Blower door test for small apartment building
"The most accurate way to accomplish this is to have 4 blower doors running at the same time, one…"
2 hours ago
Brett Little posted a discussion

Tour 2 IL New Built Homes - 1 LEED Silver - 1 Zero Energy Ready

During the IL Green Built Home Tour, we looked at 2 homes right down the road from each other to…See More
3 hours ago
Jan Green commented on Pearl Certification's blog post Two National Brands Join Forces Demonstrating Unity in Home Energy-Efficiency Rating Systems
"Congratulations to Pearl for innovative thinking and finding the right path to ensure these homes…"
4 hours ago
Rob Salcido replied to John Nicholas's discussion Reference Homes for Rating Comparison in the group Home Energy Ratings
"Hello John, Look under the Help Menu in REM/Rate and you should see a "UDRH Syntax…"
6 hours ago
Rob Salcido joined Evan Mills's group
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Home Energy Ratings

Calculating them; visualizing them; explaining them; selling them .... there is a lot to discuss…See More
6 hours ago
Corbett Lunsford's video was featured

“Airtight" Buildings Debunked by Chemistry

I've been telling people that the 475 High Performance Building Supply membranes I build with are airtight but vapor open for years. Turns out, sometimes I'm an idiot. Here's the real deal. Featuring Delphine Farmer and Marina Vance of the HOMEChem…
6 hours ago
Corbett Lunsford posted videos
6 hours ago
Profile IconLaura Zabriskie and Dave Codd joined Home Energy Pros Forum
22 hours ago
Brett Little posted a discussion

Take a tour of an IL Zero Energy Ready Modular Home 3pt series

Architect Tom Bassett Dilley wants to invite you into this exclusive tour of a zero energy ready…See More
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