Dennis Heidner
  • Kirkland, WA
  • United States
Share on Facebook Share on Facebook Share Twitter

Dennis Heidner's Friends

  • Curt Kinder

Dennis Heidner's Groups

 

Dennis Heidner's Page

Latest Activity

Dennis Heidner commented on Dale Stephens's blog post LED Lighting 24-month update 18,240 hours & counting
"Dale, good write up. For the landscaping bulbs,  if they had been T3 12V wedge bulbs,  I switch to 40 lumen bulbs sold by SuperbrightLEDS about eight years ago now.  The cost about $5 a bulb... I haven't had a failure in the…"
yesterday
Dennis Heidner replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"1kW of electric is approximately equal to 3427 BTU's of heat.  In electric hot water heaters close to 98% of the 1kW is used to heat the water... the other losses are in thermostat - and wiring up to the heater.   Once the water is up…"
Dec 12
Dennis Heidner replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"German electric prices are less than Hawaii.   Frank was very accurate when he said it is location.  Electric rates,  NG, propane, fuel oil, all very by market locatikons as does the solar insolation. Southern Germany can get a lot…"
Dec 12
Dennis Heidner replied to Bob Blanchette's discussion Dual Fuel Systems, at what point do they make sense?
"It depends where the source energy will be coming from.  If the customer already had put solarPV on the roof,  some of that daytime electrical energy might be coming from their own premise.   Also if the heat pump is used for…"
Dec 4
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

Profile Information

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

Comment Wall (1 comment)

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

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!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Profile IconWes Anderson, Jean-Paul and Bryan joined Home Energy Pros
11 hours ago
Dennis Heidner commented on Dale Stephens's blog post LED Lighting 24-month update 18,240 hours & counting
"Dale, good write up. For the landscaping bulbs,  if they had been T3 12V wedge bulbs,  I…"
yesterday
Brett Little commented on Tom White's video
Thumbnail

The Future of Housing - And How Airtightness Can Help

"It's very true! So many people and contractors have tons of insulated attics but no air seal…"
yesterday
Chris Leach replied to Richard Beyer's discussion "The Dangers of Using Spray Foam Insulation"
"The problems will surface soon enough . Why don't we take a second look at this over rated…"
yesterday
Don Fitchett commented on Tom White's video
yesterday
tedkidd replied to Bob Blanchette's discussion How does Cycles Per Hour affect real world AFUE?
"Want to spot a simpleton? It's a guy who thinks EE and comfort are disconnected.  Want…"
yesterday
tedkidd commented on Tom White's blog post Clean Energy Works Oregon: Total Home Performance
"Nice post Tom! I really like how he puts that. Leveraging interests so they can optimize…"
yesterday
Kent Mitchell commented on Tom White's blog post Clean Energy Works Oregon: Total Home Performance
"As a contractor in the region - we frequently wonder how/why you can be a non-profit?  Oregon…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service