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 Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"This is a great sub-thread, thanks you two! I'll be looking into some of the projects/studies you've referenced. "
Mar 26
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Thanks again for the thoughtful perspectives, David. I've never heard the thermal lag justification for use of 99% design conditions. Is that written in Manual J or elsewhere? Very interesting stuff, especially the linkage between using…"
Mar 26
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Dara, I've not heard of this issue before, and it's very interesting, indeed. But it sure seems like this could happen due to any number of issues, such as the operation of other exhaust devices, continuous exhaust fan, or even just any…"
Mar 26
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"David, I know the pressure reaches static levels quickly. I meant, how quickly then does radon begin to emit or be drawn into the space at a higher rate. For example, initially drawn by depressurization into a basement and then rising up into the…"
Mar 25
Brennan Less replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Hi Don, great sequence of questions, and a couple of thoughts. Overall, I just don't see depressurization, especially short-term and infrequent (as caused by cooking appliances), as being a major risk to health or building durability.…"
Mar 25
Brennan Less replied to Rob Madden's discussion Determining Duct Leakage based solely on blower door and pressure pan testing
"The DeltaQ duct leakage test uses only a blower door fan to measure duct leakage to outside at actual HVAC system pressures, as they exist/occur during system operation. So, for example, a leak at the return plenum is not treated the same as a leak…"
Mar 14
Brennan Less liked Jim Gunshinan's blog post Our First Year with Solar Panels, by Chris Stratton
Jul 19, 2018
Brennan Less replied to Linda Wigington's discussion Good Eating with Reduced Cooking Emissions in the group Kitchen Ventilation
"Cook outside, as much as you can, and close your doors/windows while you do it ;) "
May 24, 2018
Brennan Less joined Bob Krell's group
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Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon, lead, air duct cleaning & HVAC hygiene, and building performance/ building science-related topics that affect the healthiness of our indoor environments, like air leakage.See More
May 17, 2018
Brennan Less replied to Alan Lehman's discussion Zehnder Comfopipe vs. rigid pipe
"Also, if it's exceptionally cold outside, you could have a supply air temp into the living space that is below the dew point. For example, if it were 70F inside and -30F outside and you have a sensible efficiency of 70% (Zehnder is higher, I…"
Apr 26, 2018
Brennan Less replied to Alan Lehman's discussion Zehnder Comfopipe vs. rigid pipe
"Good questions. I would say that on the "house" side, which is connected to the inlets and outlets in the living space, there should be no need for insulated ducting, if the duct runs are in conditioned space. But the ducts connected to…"
Apr 26, 2018

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 9:55pm 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

REALLY????

Started by Danny Gough in HVAC. Last reply by Danny Gough on Saturday. 12 Replies

How to Insulate Exposed Outdoor Ductwork?? Help

Started by Daniel Baur-McGuire in General Forum. Last reply by Bradford E. White on Friday. 7 Replies

Where to spend my marketing dollars?

Started by Trip Smith in Marketing. Last reply by Building Performance Institute on Tuesday. 10 Replies

Easy Tests for HVAC during audit

Started by Craig Bird in Weatherization. Last reply by John White May 9. 19 Replies

Water heater ventilation question

Started by Luis Hernandez in General Forum. Last reply by Dennis Heidner May 8. 23 Replies

Polar vortex photos of ice forming INSIDE homes!

Started by Diane Chojnowski in General Forum. Last reply by Michael Cuomo May 4. 1 Reply

LEED for Homes Green Rater Training

Started by Ryan Moore in Training. Last reply by Michael Cuomo May 3. 1 Reply

Latest Activity

Caleb Y Simon replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"I concur with your IMC interpretation. I have used this before with code officials and they have…"
1 hour ago
Ed Fritz replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"As a radiant barrier manufacturer I've been fighting this bad information for years. I've…"
1 hour ago
Sam Price replied to Tom Smith's discussion Assessing the true end user price of installing a new boiler?
"There are so many factors when calculating the cost of a new boiler. It's not quite as simple…"
2 hours ago
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2 hours ago
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"Read the manufacturers claims and installation steps closely  The foil needs a dead…"
12 hours ago
Danny Gough replied to Danny Gough's discussion REALLY????
"As I have read through everyone's excelent responses, it has caused me to reassess my…"
Saturday
Tim O'Brien replied to Danny Gough's discussion REALLY????
"Bradford - I have seen single family homes with ducted central AC or heat pump hold enough water…"
Friday

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