Brennan Less
  • Berkeley, CA
  • United States
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Trends in space conditioning systems in high performance homes, looking for your insight
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

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

 

Brennan Less's Page

Latest Activity

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
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
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
"Ken, can you send me a copy of the report (bdless@lbl.gov)? I would love to review it. I'm not sure I can include the data points in my summary (as we're nearly finished writing the report), though I've already used what was provided…"
Jan 23, 2014
Brennan Less replied to Corbett Lunsford's discussion CAZ Depressurization: NOT a Big Deal?
"I'm glad to see that folks are getting interested in this. Ron, great point about chronic low-level exposures. These are certainly of concern, and are on the radar of folks at LBNL. Also, Judy, GREAT point about localized exposure in basement…"
Jan 3, 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
"Congratulations Linda! 20 projects is really great, and their energy performance is stellar. I assume that since you are sharing this, that the attached data are open for use by others? I've just finished aggregating DER performance across the…"
Dec 12, 2013
Brennan Less joined David Eggleton's group
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1000 Home Challenge

Linda Wigington distinguished between deep retrofits & deep energy reductions, thus expanding the range of strategies & tactics from which we might propose when engaging with people, the ones who choose.See More
Dec 12, 2013
Brennan Less replied to Rich Johnson's discussion Which Hydronic Air Handler
"Ben Schoenbauer, Pat Huelman and others in Minnesota have tested the retrofitted performance of a number of these systems, including a variety of models.  This report would be worth checking out.  Good…"
Feb 14, 2013
Brennan Less replied to Craig Bird's discussion Sources for duct insulation savings
"Here's an LBNL research report by Iain Walker, who tested 24 retrofitted duct systems in the Central Valley of CA.  Retrofits increased delivery efficiency by 64-76%, and reduced HVAC system energy by 18%, on average.  This is going…"
Feb 14, 2013
Brennan Less replied to Steve Waclo's discussion Ceiling/attic temperature differentials in the group EnergySoft Energy Pro
"Most residential compliance software will not allow you to make adjustments for stratification (in fact, I know of none...).  Much more troublesome software does allow such customization by the user at significantly more effort and probably not…"
Jan 24, 2013
Brennan Less replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"I would not recommend using a pitot tube, as the accuracy of your flow measurement will depend upon the average velocity pressure across the flow field of the duct, which may or may not be symmetrical.  Either way, a pitot tube traverse will…"
Jan 24, 2013

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

 
 
 

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