Brennan Less
  • Berkeley, CA
  • United States
Share on Facebook Share

Brennan Less's Friends

  • Rebecca Olson
  • Linda Wigington
  • Home Energy Magazine

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
Thumbnail

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)

You need to be a member of Home Energy Pros Forum to add comments!

Join Home Energy Pros Forum

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

Water heater ventilation question

Started by Luis Hernandez in General Forum. Last reply by Bradford E. White 1 hour ago. 11 Replies

Exterior green cladding

Started by Luis Hernandez in General Forum. Last reply by Dennis Heidner on Friday. 3 Replies

Faces & Places of HPC19

Started by Diane Chojnowski in General Forum Apr 5. 0 Replies

high rise humidity

Started by Steve Nations in HVAC. Last reply by Dennis Heidner Apr 3. 7 Replies

Follow the action at #HPC19

Started by Diane Chojnowski in General Forum Apr 2. 0 Replies

Unvented Roof Assembly

Started by Patrick Michaelyan in General Forum. Last reply by Wallacebastien Mar 30. 6 Replies

Technology and Customer Service

Started by Kelly Caplenas in General Forum. Last reply by Franco Oyuela Mar 25. 1 Reply

Latest Activity

Bradford E. White replied to Luis Hernandez's discussion Water heater ventilation question
"This has been a topic of discussion for 20 years now. It is true that appliance manufacturers often…"
1 hour ago
Wallacebastien replied to Rob Madden's discussion Determining Duct Leakage based solely on blower door and pressure pan testing
"Doors can sometimes not be tight, so you should watch out for it carefully. For example this can be…"
1 hour ago
John White posted a blog post

Air Conditioner Not Blowing Cold Air

Air conditioners must be tuned to experience better performance and enjoy the pollution-free cold…See More
5 hours ago
Franco Oyuela replied to Luis Hernandez's discussion Water heater ventilation question
"Common Water Heater Problems: Water Leaking From the TopWater Leaking From the BottomReader…"
14 hours ago
Jill Lindman posted events
17 hours ago
dale garren replied to Luis Hernandez's discussion Water heater ventilation question
"make sure the gas modulator / controller valve has propane orifices (jets), if it came from factory…"
17 hours ago
Home Energy Magazine posted a blog post
17 hours ago
Ken Summers replied to Luis Hernandez's discussion Water heater ventilation question
"I agree with Sean to bring in a technician that can do some diagnostics on it.  I would also…"
18 hours ago

© 2019   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service