Brennan Less
  • Berkeley, CA
  • United States
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Brennan Less's Discussions

Trends in space conditioning systems in high performance homes, looking for your insight

Started this discussion. Last reply by William H Nickerson Jul 1, 2012. 4 Replies

Can anyone comment on the common types of heating and cooling systems installed in their region in high performance homes?  More and more, I see designers and builders turning away from forced air…Continue

 

Brennan Less's Page

Latest Activity

Brennan Less replied to Kim Tanner's discussion Origin of guarded blower door testing
"I would look into reports from the 1980s by Sheltaire Scientific for the CMHC. Here's an example for testing procedures to use multiple blower doors to characterize attic ventilation leakage areas. Also, check out this LBNL…"
Aug 3
Brennan Less replied to Brent Shapiro's discussion Investigating 3257KWH monthly usage issue.
"What about a hot water plumbing leak? I would expect on the order of 5,000 kWh per year with typical usage on an electric tank water heater. But if there's a plumbing leak, then who knows...Also check for hidden electric resistance heat, in…"
Jun 22
Brennan Less replied to Daniel James Grundy's discussion Stack/wind pressure and flow networks.
"Daniel, I'm assuming you're trying to predict the airflows through the different openings W1, ... ? It is very unclear from the drawing. You're probably aware, but solving the problem requires calculating the pressure…"
Mar 23
Brennan Less replied to Bruce Ceniceros's discussion How effective are whole house air cleaners?
"Here's a link to a presentation given to summarize the work. Some of it is a bit dense, fair warning. Focus on the table on page 32, figure on page 35, page 42 and the Key Results slides 45-47. Notable info, the supply ventilation with MERV 13…"
Dec 1, 2016
Brennan Less replied to Bruce Ceniceros's discussion How effective are whole house air cleaners?
"Bruce, If you like, I can share some results from a recent ARB study we performed testing the effectiveness of a variety of filtration systems in a test home in a Sac suburb. Basic summary, whole house filtration, driven by a continuous fan (or…"
Dec 1, 2016
Brennan Less replied to Rob Madden's discussion Indoor Air Quality Monitors and Meters
"Anyone interested in this realm should check out the EPA-funded project at the South Coast Air Quality Management District for comparing the accuracy of low-cost air quality sensors against reference equipment. Results are HIGHLY variable and…"
Aug 22, 2016
Brennan Less replied to Sean Lintow Sr's discussion Duct Testing - is a change in order? in the group Best Practices (Residential)
"Duct surface area clearly gives the more precise assessment of the quality of the installed duct system. But that precision is only precise in appearance, due to the difficulties of getting the correct surface area number. This is similar to blower…"
Aug 6, 2015
Brennan Less joined Sean Lintow Sr's group
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Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what needs to find it's way to the dust bin of history?See More
Aug 6, 2015
Brennan Less commented on Home Energy Magazine's blog post Revisiting Electrification
"In case this is useful for anyone, I have calculated the 2010 carbon emissions per unit of delivered electricity (lbs./kWh) for each state in the U.S. (based on eGRID data). The map below of the US highlights states where a best-in-class…"
May 5, 2015
Brennan Less replied to Bud Poll's discussion Another benefit from air sealing
"Thanks Bud. I just feel the need to point out any such issues, because we as a field need to be inclusive of women, both as home performance professionals and as homeowners (and elsewhere). I understand that it was not your intention, I'm…"
Aug 28, 2014
Brennan Less replied to Bud Poll's discussion Another benefit from air sealing
"I would love to see such matters discussed on this forum without broadly characterizing women as weak and irrational. As for the other benefit of air sealing, it is certainly something that home/pest inspectors regularly recommend to limit pest…"
Aug 28, 2014
Brennan Less replied to Home Energy Magazine's discussion Let's Talk Gender
"I recently was working on a project, dominated by men, in which one woman was a contributor. Now, I'm not privy to all the details, but at some point, I noticed that the email string no longer included her. I brought this up casually by email,…"
Aug 7, 2014
Brennan Less replied to Stephen Standley's discussion Which reading is more reliable on a Minneapolis Duct Blaster?
"To reiterate what Glen said, always use the smallest ring that allows you to achieve the desired level of (de)pressurization. It will always be the most accurate reading available. "
Aug 7, 2014
Brennan Less replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"William, maybe I miscommunicated. In my personal experience (largely in the Bay Area PH projects), as well as from my observations from the larger PH community of homes (presentations on the topic by Katrin and W. Feist), the most common kitchen…"
Jun 20, 2014
Brennan Less replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"Kaushal, As an LBNL building scientist who studies deep retrofits, I can confidently tell you that (1) airtightness matters, even in Berkeley, and (2) that it is very unlikely to make a home uncomfortable (assuming you provide ventilation and…"
Jun 19, 2014
Brennan Less replied to Linda Wigington's discussion Actual Energy Use - 20 Thousand Home Challenge Projects & 20th Project to Meet 1000 Home Challenge in the group 1000 Home Challenge
"Thank you Ken, I'll read this with much interest."
Jan 27, 2014

Profile Information

Company
LBNL
Professional Interests
Building science research. Deep energy savings in existing homes. Performance monitoring. Ventilation and indoor air quality.
Twitter ID
@brennanless

Comment Wall (1 comment)

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At 6:55pm on September 11, 2011, Diane Chojnowski said…

Hi Brennan,

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 upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

Forum Discussions

Origin of guarded blower door testing

Started by Kim Tanner in General Forum. Last reply by Eric Kjelshus on Thursday. 9 Replies

Electro Magnetic Fields (EMF)

Started by Barry L NewDelman in General Forum. Last reply by Daniel Cullen Aug 10. 5 Replies

When is it too windy to use blower door?

Started by Brandon Walton in General Forum. Last reply by Iain Walker Aug 10. 17 Replies

Latest Activity

Profile IconArmstrong SMith, Eric Buchalter, Liza Gonzalez and 3 more joined Home Energy Pros
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Eric Kjelshus replied to Kim Tanner's discussion Origin of guarded blower door testing
"That same house that meet highest sealing rate in early 1980 we went back and super sealed it and…"
Thursday
Jill Cliburn posted an event
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National Solar Conference and NZE Decathlon at University of Colorado

October 9, 2017 at 6pm to October 12, 2017 at 7pm
Thursday
tedkidd replied to Kim Tanner's discussion Origin of guarded blower door testing
"Brendan, Eric, great stuff!"
Thursday

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