Dennis Heidner
  • Kirkland, WA
  • United States
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Latest Activity

Dennis Heidner commented on Sean McLoughlin's blog post Programming in-floor electric radiant heat, is it worth it?
"The key is that this is the bathroom.  Occupancy is not constant.  It is more likely used in the morning and late afternoon.  If the house is in a cooling dominated zone - the heat on all the time adds to the cooling load.  For…"
Apr 23
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"Tom,  in the study  http://peec.stanford.edu/docs/modeling/research/Deconstructing%20the%20Rosenfeld%20Curve.pdf The authors try to explain the differences between US and California per capita consumption, due to population, building…"
Mar 21
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"Tom,  in our area  (Seattle) use something like Roxul for the exterior insulation... stay away from the XPS/EPS "
Mar 12
Dennis Heidner commented on Home Energy Magazine's blog post At Home with the Internet of Annoying Things
"Nice article. I am an electrical engineer, creating sensors for data collection and "possibly internet of things";  I do believe many people, promoters and companies are going over board.  That came up multiple times at last…"
Mar 2
Dennis Heidner replied to Patrick Michaelyan's discussion Vinyl Siding with Integral Insulation
"The observation about rot is important.   I agree. One of my complaints with some of the proposed insulated vinyl sidings - is the suggest simply putting it over the top of the existing siding.   I believe BSC and one of the national…"
Feb 27
Dennis Heidner replied to Patrick Michaelyan's discussion Vinyl Siding with Integral Insulation
"If you are using Hardie on a building,   James Hardie recently released a note that says in the near future new installations using their product WILL require at least a 3/8 air gap for the drainage plane."
Feb 26
Dennis Heidner replied to Patrick Michaelyan's discussion Vinyl Siding with Integral Insulation
"Interesting, in that I had a "heated" discussion at the Seattle Home Show about a week ago with a distributor of a vinyl siding product that had insulation.  While I personally would avoid the product,  he did make a valid point…"
Feb 26
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"Tom, "My issue is that American Architecture is dumbed down to think you can be net-zero and not collect thermal energy, that's storing heat in winter, cold in summer at the right time of day or night." Perhaps you need to visit the…"
Feb 21
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"The energy that you can get from a wind turbine is proportional to the swept area.  If you can get ten times more energy from a small wind turbine by changes to the generator - then you could get ten times more energy from those massive wind…"
Feb 20
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"Tom,  there is a significant efficiency loss when you look at the energy used with batteries on site by each windmill.  I'd fallen into that trap before and it just doesn't pan out.   In most cases you would be taking the AC…"
Feb 20
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"http://www.lasvegassun.com/news/2009/apr/13/authority-opposes-recycling-homes/ If you do not have an already built infrastructure to handle the sewage, then certainly greywater use as you suggest may be efficient.  If you are part of a…"
Feb 19
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"John, you and met after one of your presentations in Chicago last week. One of the very obvious errors - is to assume that houses built under title 24 with the codes and regulations remain code complaint and will perform as designed over time.…"
Feb 19
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"There are also reports looking at the impact of grey water recycling and using it for the outdoor landscaping which show it may not always be the most efficient.   In Las Vegas  for example, the water that is returned to the sewers is…"
Feb 19
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"Hand dish washing can actually be more energy intensive than the modern most efficient dishwashers.  There are conditions of course... but often had dish washing involves using far more than the 2 gallons total water that might be used in one…"
Feb 17
Dennis Heidner replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"One of the obvious mistakes in the Elsevier article is:  "And fourth, the five other states with the lowest per-capita growth in residential electricity use, also depicted in Fig. 2, are California’s western neighbors: Nevada,…"
Feb 14
Dennis Heidner replied to George Kopf's discussion Utility death spiral = higher taxes? Perhaps...
"Agreed,  that is in part why benchmarking of commercial buildings including apartments, multi-family residential buildings has been adopted in many of the larger cities... and over the next 20 - 30 years it may be pushed down to smaller…"
Jan 19

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…

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Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Morgan, I got this below from the Knight installation manual. I note a few things, -These…"
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Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
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