Dennis Heidner
  • Kirkland, WA
  • United States
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Latest Activity

Dennis Heidner commented on Laurie Guevara-Stone's blog post How Many Hours-of-Safety Do Our Homes Have in Extreme Weather?
"Good post for thermal safety. One area missed is beyond just the temperature ranges -- is how the house responds to moisture.  If the heating / cooling system is no longer available is the house able to maintain the relative humidity in a range…"
Aug 8
Dennis Heidner replied to Luis Hernandez's discussion Proper range hood for natural gas 30" stove for an airtight home in the group Kitchen Ventilation
"For residential homes there are not a lot of sensing options out there that have tested and been certified.    There are several issues with kitchen cooking - and they apply to all stoves not just gas! 1) capture range of the hood. …"
Aug 1
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"One of the VERY first basic science principles that are taught is that "CORRELATION IS NOT CAUSATION" https://towardsdatascience.com/why-correlation-does-not-imply-causation-5b99790df07e Konrad Danneburg would have one to remind you of…"
Jul 20
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"I agree with Jeff,  it looks like you are cherry picking the data and your authors to validate your beliefs.    Looking for data to the data as you've done without also looking for the geological events (volcanoes, etc... ) and…"
Jul 16
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"He's a meteorologists that thinks like a meteorologist...  if it's at 7000 ppm you have to look at what else just happened in the 100+ years before.  For example a large asteroid that hits earth,  blows dust into air and…"
Jul 13
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"Okay,  here is one example of sea level rise and the loss of islands. https://www.bbc.com/news/world-europe-36255749 It's easy when you live inland to say that there isn't a problem.   But when you look at the more frequent…"
Jul 13
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"Joe Bastard is a meteorologist not a climate scientists.   Day and night difference in how they look at the world around them.    There observations are based on two very different views and philosophy's with Joe always…"
Jul 13
Dennis Heidner replied to Jacob Corvidae's discussion The problems with gas stoves
"You forgot to add, the obvious.  Charcoal filters for recirculating the stoves filtered exhaust back into kitchen does nothing to remove the CO2, CO, or NOx that is produced.  I may only remove some of the VOC's and  all depends…"
Jul 13
Dennis Heidner replied to Mark Furst's discussion Worst boiler ever?
"Wow,  a combination boiler and basement fireplace... great for toasting marshmellows and hotdogs while awaiting the fire department...."
May 23
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?
"Pests are also a really good reason to seal duct work with either the approved mastic OR aluminum duct tape... not the sticky "un-Duct" tape that DIYers use... "un-Duct" can be tasty for some critters..."
May 22
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?
"If you look closely ... can you see rat or mice teeth marks on foil?   Some of the modern materials are gourmet meals for rodents.   E.g.  they really enjoy a snack on some PEX  or the insulation from some automobile…"
May 22
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?
"I believe one of the issues is how does one defend themselves against an HVAC contractor that insists it is okay.   And the answer to that would have to be pull articles from ACCA or AHRI which say that reflective bubble wrap is worthless…"
May 20
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?
"Links for Build America and Building Science…"
May 20
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?
"Correct,   but when testing has been done on sealing ducts with wraps... (See the BTO and Build America website for reports... plenty of research done by ASHRAE and universities also) the seals are never really tight enough to prevent the…"
May 20
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 space  "To achieve a thermal resistance of R-8, 2-inch-wide spacer strips of rFOIL™ reflective foil insulation arewrapped around the duct…"
May 19
Dennis Heidner replied to Luis Hernandez's discussion Water heater ventilation question
"I don't think he needs to worry about the vent.  I think he saw what appeared to be yellowing pipe and a possible burn on the pipe and was concerned. CPVC has a higher temperature rating than ordinary PVC.  Often around 180F under…"
May 8

Profile Information

Company
Rextorgroup
Professional Interests
Energy efficiency, building envelop, renewables, building modeling

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At 3:25pm on March 21, 2013, Diane Chojnowski said…

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Ed Minch commented on Blake Reid's blog post Blower Door Testing in Hawaii
"Glad to see they went with 5 ACH50.  This is very easy to achieve in even small houses and…"
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