Dennis Heidner
  • Kirkland, WA
  • United States
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Dennis Heidner replied to King Rosales's discussion Where did you buy your LED lights?
"We get used to it.  Daylight bulbs are more efficient; however if you search the journals for the impact of using daylight (bluer bulbs), one side effect that has been suggested is a shifting of sleep habits, resulting in increased insomnia.…"
Nov 14
Dennis Heidner replied to King Rosales's discussion Where did you buy your LED lights?
"Curt,  in the NW - energy efficiency improvements have a significant priority.  Utilities are able to count efficiency improvements into their RPS.  See the attached picture for the result."
Nov 12
Dennis Heidner replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"It isn't only the number of adults and the kids in the house.  Your usage patterns are also important.  Put a note pad by each sink, shower/tub and have family members keep track of when and for how long they've used HOT water.…"
Nov 6
Dennis Heidner commented on Christopher Morin's blog post Should this Duct Layout be Banned?
"In the picture above, it appears that the attic has been turned into conditioned space.  The temperature stacking chart presented is not likely to be what you would see.   Turning the attic into conditioned space also helps with…"
Sep 4
Dennis Heidner replied to Christopher Talarico's discussion Heating with Tankless Water Heater & Hydronic Air Handler vs. Gas Furnace
"Rinnai has application note on how to use their tankless hot water heater with a Rinnai water to Air heat exchanger. Build America - via Building Science Corp, published report in…"
Aug 30
Dennis Heidner replied to Jamie Kaye's discussion Flickering LED lights
""CFLs produce light by using electricity to instigate a chemical recation between mercury vapor and a phosphorescent powder." Not a chemical reaction,  if so you would see life significantly limited by the amount of chemicals that…"
Jul 31
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

Profile Information

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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