Dennis Heidner
  • Kirkland, WA
  • United States
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Latest Activity

Dennis Heidner replied to Paul Raymer's discussion Oily Stuff in ERVs
"It does make a difference where you are seeing the oily stuff.   If humidity is very high,  and there is any organic dust (skin particles,  VOC's etc) that are carried in the air stream - its possible that the oily stuff is…"
Thursday
Dennis Heidner replied to Kyle Baker's discussion Thoughts on EVs? Love em or hate em?
"Questions to ask such that reasonable answers can be made: 1) Where do you live,  urban or rural areas?  Distance from town? 2) How much do you drive each day?  Each week? 3) Are there lots of suitable charging stations available in…"
Thursday
Dennis Heidner replied to Paul Raymer's discussion Oily Stuff in ERVs
"Coming from the exchanger cores?  or below the motors?   Fresh air inlet side our outlet side?  Inside house air inlet/outlet side?"
Thursday
Dennis Heidner commented on Building Performance Association's blog post New Legislation: The Access to Consumer Energy Information Act Aims to Educate Consumers and Enact Change
"For Steve Kramer, Once a month bills - make it quite difficult to identify how the energy in the house is being used.  For the gas bill - is the largest use for a hot water heater,  the furnace or gas range?  By making the data…"
Thursday
Dennis Heidner commented on Larry Weingarten's blog post Tired of Blackouts? Get Off The Power Grid!
"Larry,  about the comment to Leslie,  The comment attributed to Ronald Reagan -  "Efficiency means freezing in the dark."  It reflects the views of people living in the dark ages.   Efficiency…"
Thursday
Dennis Heidner replied to Michael Johnson's discussion Getting better without being so negative (depressurization)
"We know what the definition of "not going negative is..." but the definition of "good residential IAQ"  has and continues to be a subjective definition.  Even ASHRAE has danced around it.  EPA (mostly for political…"
Feb 18
Dennis Heidner commented on Sam Feder's blog post Mechanical Room Temperature
"Is the room insulated? Have you measured the temperature of the room during the heating season? With the furnace in the room, and the duct work coming into the room, my guess is that you've got a lot of heat loss into the room that would…"
Jan 9
Dennis Heidner replied to Kyle Baker's discussion Solar ROI Calculator
"Are you sure it is a "25kW" system and not a "2.5kW" system.  25kW would be about 80 PV modules on the roof top (roughly),  and perhaps five or six Xantrex inverters (5kW each).  The majority of homes are 5kW or…"
Oct 14, 2019
Dennis Heidner replied to Ben Stallings's discussion radon mitigation with HRV?
"If the VOC and CO2 is coming from the basement floor drain... that's easy to test the hypothesis... move your Uhoo down next to the drain...because of the close proximity to the drain the gases would not have diffused as much and it should go…"
Oct 1, 2019
Dennis Heidner replied to Ben Stallings's discussion radon mitigation with HRV?
"There are a couple of important items in your post that started this thread.    First,  you believe you already have an indoor air quality problem (excluding the radon issues). Second, your wife is planning on having an art studio in…"
Sep 30, 2019
Dennis Heidner replied to Kyle Baker's discussion Solar ROI Calculator
"Or just use the PVWATTS calculator on the NREL website. https://pvwatts.nrel.gov/ It doesn't send information outside to third parties that might then send junk mail and call you at home."
Sep 28, 2019
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"Yup,  I'm not sure you want to even try tightening up a modular home built before 1975.  I think it's pretty risky.  These were not homes designed to last fifty+ years.  I've seen the fiberglass in those old walls…"
Sep 19, 2019
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You made some very important observations. It's really important to think about how tight you air seal a modular home.  Replacement air for combustion devices such as stoves, furnaces and hot water heaters depend on those leaks. Tighten up…"
Sep 19, 2019
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You didn't mention anything about the age of these homes.  Early mobile/modular homes (1960's) sometimes had walls that were made with 2" thick walls,  HVAC duct coupling between sides of a double wide - depended on the…"
Sep 19, 2019
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"One  of the issues with the jump in readings - may also be related to the instrument design and its sensors.   If the CO2 reading is via an electrochemical sensor and not a nondispersive infrared sensor (NDIR), then its possible…"
Aug 30, 2019
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"But he could use a Panasonic in the bedroom... Or the work area  that he sits in all day. Depending on the size of the house... the total continuous fresh air needs may only be 40cfm to 100cfm.   It doesn't sound like he's…"
Aug 30, 2019

Profile Information

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

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At 3:25pm 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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Forum

Looking to buy used equipment

Started by Heidi McCullough in General Forum. Last reply by Van Moon 1 hour ago. 4 Replies

Interview Posts for Consumer Education Blog?

Started by Sarah Alexander in General Forum. Last reply by Sarah Alexander on Friday. 5 Replies

Oily Stuff in ERVs

Started by Paul Raymer in HVAC. Last reply by Dennis Heidner on Thursday. 5 Replies

Thoughts on EVs? Love em or hate em?

Started by Kyle Baker in General Forum. Last reply by Dennis Heidner on Thursday. 19 Replies

building envelope air tightness studies

Started by Greg O'Beirne in General Forum. Last reply by Greg O'Beirne on Wednesday. 19 Replies

Watts Up? Pro - Software Download

Started by Todd Abercrombie in General Forum. Last reply by Sean Wiens on Wednesday. 3 Replies

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Van Moon replied to Heidi McCullough's discussion Looking to buy used equipment
"I have all of that, except no wifi adapter.  They are discontinued.   I have a DB…"
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Kristina Frunze commented on Kristina Frunze's blog post A Contractor’s Guide to Compensating for Oversized Air Conditioners
"@Kent Browning You are correct, I meant to say dehumidifier. Thank you for correcting that."
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Kristina Frunze's blog post was featured

A Contractor’s Guide to Compensating for Oversized Air Conditioners

Most HVAC contractors know that an oversized air conditioner wastes substantial amounts of energy…See More
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Veterans in Energy Efficiency - Who do you know?

Did you know that >236,000 U.S. veterans are now employed in energy efficiency? Veterans share…See More
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Sales Executive: HVAC Network (Remote)

Pearl Certification seeks an experienced, motivated, and successful educational salesperson to…See More
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5 HVAC Myths That Are Influencing Your Customers

As an HVAC professional, it can be very easy to forget that not everyone has an intimate…See More
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Kent Browning commented on Kristina Frunze's blog post A Contractor’s Guide to Compensating for Oversized Air Conditioners
"" Installing a Humidifier A humidifier is another option worth considering. To overcome the…"
Saturday
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