Dennis Heidner
  • Kirkland, WA
  • United States
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Latest Activity

Dennis Heidner replied to Bachi Brunato's discussion Modeling a Gas Fireplace in Wrightsoft
"I think that was part of his concern.  Its a sealed combustion unit.  So the infiltration that might be used for an ordinary fireplace is going to be off the chart.  If its a new home with high end sealed combustion fireplace,…"
Wednesday
Dennis Heidner replied to Quinn Korzeniecki's discussion Let's Play Stump the Chump! What's Wrong with this Picture? in the group Building Performance Institute (BPI)
"The demarcation between the thermal hot and cold, appears to correspond with floor plate.  If you look carefully you can see the framing members in the picture... three levels.  The underside of the roof is very hot, it was in the shade…"
Monday
Dennis Heidner replied to Quinn Korzeniecki's discussion Let's Play Stump the Chump! What's Wrong with this Picture? in the group Building Performance Institute (BPI)
"South facing roof,  looks like around noon.   1. Two possible AC units?  One heating,  one cooling? 2.  Nice sunny  summer day,  clothes line empty - the dryer is being used in the house?  On a nice summer day…"
Aug 20
Dennis Heidner joined Leslie McDowell, BPI's group
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Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization for residential energy efficiency retrofit work.See More
Aug 20
Dennis Heidner replied to Bachi Brunato's discussion Modeling a Gas Fireplace in Wrightsoft
"When you model,  add a small additional area  -- say less than 10 sq inch of for possible air leaks...(that should be real high)... be safe and model the fireplace at 60%... efficient.  It really should be used just occasionally not…"
Aug 15
Dennis Heidner replied to Bachi Brunato's discussion Modeling a Gas Fireplace in Wrightsoft
"What kind of gas fire place?  Gas logs... in "generic brick fireplace" with dampers that are left open?  Or a sealed combustion fireplace insert?  With a pilot or pilotless?"
Aug 12
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

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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Diane, HEP Moderator

 
 
 

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Malcolm McKelvie replied to Alan Gindt's discussion Minneapolis Blower Door System for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
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