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 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
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
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
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
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
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
William H Nickerson replied to Brennan Less's discussion Trends in space conditioning systems in high performance homes, looking for your insight
"You know I thought one day I would get a chance to share this story. A while back I worked for a buddy of mine on a big job for him putting in wall paper on a really nice 9 K sq. ft. home. The owner was very nice and obviously had retired well. He…"
Jul 1, 2012
Mauro Small, P.E., LEED AP replied to Brennan Less's discussion Trends in space conditioning systems in high performance homes, looking for your insight
"In California geothermal heat pump systems and air handlers with evaporative cooling.  In some instances, you can do with evaporative cooling alone without requiring mechanical cooling.  If you are in northern California,…"
Jun 18, 2012
Rebecca Olson replied to Brennan Less's discussion Trends in space conditioning systems in high performance homes, looking for your insight
"Brennan, Combi-systems for forced air is what we have been exploring in MN.  It is a compelling alternative to a separate furnace and water heater especially when the loads are low because you can add the heating load with the water heating…"
Jun 15, 2012
Bob Blanchette replied to Brennan Less's discussion Trends in space conditioning systems in high performance homes, looking for your insight
"Mini-splits are excellent for homes with open floor plans. If a home has a lot of smaller rooms mini-splits don't do so well. Getting contractors to believe you can cool a 2,000 sq ft house with a 2ton central A/C unit can be a challenge."
Jun 14, 2012
Brennan Less's discussion was featured

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

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 and towards radiant hydronic or point-source systems (like mini-splits).  Reasons include mismatch between load and size of forced air furnaces, zoning control, lower pumping energy, distribution system takes up less space, better integration with solar thermal, etc.  Granted my scope is mostly…See More
Jun 14, 2012

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

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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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