Dennis Heidner
  • Kirkland, WA
  • United States
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Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"The key is the attention to the details,  you really have to seal any "roof" ducting.  It can't be leaky where it would allow air elsewhere from the attic or under the eaves to be pulled in -- unless it is filtered before…"
Jul 12
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"There are a several of issues with using the roof as solar collector.  If carefully engineered it could work,  done wrong and your house and pocket book will forever suffer. First,  is heat, roofs and attics do indeed get very hot.…"
Jul 11
Dennis Heidner replied to Jamie Kaye's discussion Flickering LED lights
"If it is an A-19 type screw base,  the fixture and wiring should be compatible.  The reason is that with an A-19 bulb, it was possible to place perhaps a 100W bulb in the fixture.. 60W common,  even with fixtures designed for…"
Jul 7
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"For raw data about solar insolation: https://www.eol.ucar.edu/projects/hydrometnet/minnesota/minnesota.html See the various NOAA and weather station summaries.  The major MN universities are also likely to have data for solar heating…"
Jul 3
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"There is a great deal of data, engineering, white papers, and published work on solar air heating.  It can work, but you need a structure designed to use it.  That means a structure that is air tight and well insulated so that the losses…"
Jul 3
Dennis Heidner replied to Jamie Kaye's discussion Flickering LED lights
"It probably is the dimmer.   Dimmers generally operate by turning on X amount of time after the zero crossing of AC line voltage.  For full bright the X is equivalent to immediately.  For dimmed, it may be just before the line voltage…"
Jul 3
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"Ugh,  hopefully she doesn't advocate the air filtering fiberglass insulation. I suppose her argument is also that any house approved for construction and remodeling in California would need to meet prescriptive codes at about 3ACH50,…"
Jun 19
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"Thanks, Brennan. That was the point I was trying to make.  And the Berkley building official may have been trying to suggest the same point. "
Jun 19
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"The LBNL studies pretty much demonstrate that you have savings by tightening up a building... the size of that savings depends on the climate zone. I suspect you are in climate 4C  (marine) and building to at least the IEC 2012 should be the…"
Jun 5
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"I think if you read my comments and the articles - there are many caveats that go along with the suggestions.  The original question was if the particular speaker was correct or not, what do other think. and the answer in all of my questions -…"
Jun 5
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"Yeah,  and he should also suggest logging the relative humidity in the house...  wrong climate and you've just made your mold problems worse."
Jun 5
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"This might be be far more than what you want... Join us for a free webinar on June 25, 2014, presented by the U.S. Department of Energy Building America program! Each month's webinar will offer information about the latest advances in…"
Jun 1
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"In heating dominated environments it still makes sense and is important.  It is possible to loose more energy through the air leaks than you can through the walls.  If you are retrofitting a house - you need to have an energy audit done…"
Jun 1
Dennis Heidner replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
""building science specialist in charge of energy efficiency in Berkeley " The specialist may have been speaking specifically to the local Berkeley area.  LBNL has some pretty good studies that indeed show that air tightness is less…"
May 31
Dennis Heidner replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"That is probably what I was seeing also.  I  spent time in mid seventies, late 80's quick trip, then 2000, and later 2010, 2012.   The pensioners  (B&B) places still seem to use more point of use.  In 2012, I saw a…"
May 28
Dennis Heidner replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"Steven, last time I was in Germany,  nearly every residential house (older than 10 years) was still using tankless.  Newer houses were moving over to solar hot water.  In the 70's many of the small pension houses had little water…"
May 28

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

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At 12:25pm on March 21, 2013, Diane Chojnowski said…

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!

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