George M. Matthews
  • Walnut Creek, CA
  • United States
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George M. Matthews's Discussions

What is the state of California's plan to have houses at ZNE by 2020?
2 Replies

Could someone in the know please clarify the State's (law or regs) position on a requirement for houses to be Zero Net Energy by 2020?I see that a Bay Area group has created a roadmap to a clean…Continue

Started this discussion. Last reply by Hal Skinner Mar 15, 2012.

Effectively pricing duct sealing
9 Replies

I'm wondering what home performance contractors have found to be the best contract and or pricing method for air sealing duct systems?What happens when the system has leaky areas that are hard…Continue

Started this discussion. Last reply by Sean Lintow Sr Jul 27, 2011.

To replace old leaky ducts with new flex ducts or to seal the old with mastic?
9 Replies

A number of home energy pros I'm in discussion with don't think there is much use in keeping old ducts and prefer to replace them with new insulated flex ducts.Can anyone give me a more definitive…Continue

Started this discussion. Last reply by Philip Green Jan 18, 2012.

Blowing smoke - into ducts to find leaks
5 Replies

I've read about problems with blowing smoke into duct systems to find leaks. One article said that the smoke product left some bad residue inside the system. Does anyone have a good…Continue

Started this discussion. Last reply by Bruce Looney May 12, 2011.

 

George M. Matthews's Page

Latest Activity

Guy DuBois replied to George M. Matthews's discussion Trying to find %age energy saving from variety of upgrades in 10K sf multifamily house in the group Building Simulations
"O.K., forget all of the Engineer jokes! Thank you very much James. Engineers rule!"
Mar 18, 2013
James White replied to George M. Matthews's discussion Trying to find %age energy saving from variety of upgrades in 10K sf multifamily house in the group Building Simulations
"Here is a spreadsheet that I have for identifying savings using monthly bills and average monthly temperatures. We documented actual energy savings using this method during our "Reduce Your Use" contest that we conducted here at…"
Mar 18, 2013
Guy DuBois replied to George M. Matthews's discussion Trying to find %age energy saving from variety of upgrades in 10K sf multifamily house in the group Building Simulations
"Hi George, You don't happen to have a spreadsheet handy for those calculations do you? :-)"
Mar 18, 2013
John Simons replied to George M. Matthews's discussion Whole House E Test Kit for Sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Are you selling both blower door and duct blaster for 2700?"
Jul 13, 2012
Eric Sperline replied to George M. Matthews's discussion Whole House E Test Kit for Sale in the group Energy Auditing Equipment for Sale, trade or to purchase
"I'm looking for a Bacharach tester but can get one new on-line for approx. $50.00 more than your price. Are you at all flexible with your price? "
Mar 26, 2012
Hal Skinner replied to George M. Matthews's discussion What is the state of California's plan to have houses at ZNE by 2020?
Mar 15, 2012
Brian Selby replied to George M. Matthews's discussion What is the state of California's plan to have houses at ZNE by 2020?
"George, Check out the CA Energy Efficiency Strategic Plan, it should give you a better idea of what the state has planned. http://www.cpuc.ca.gov/NR/rdonlyres/A54B59C2-D571-440D-9477-3363726F573A/0/CAEnergyEfficiencyStrategicPlan_Jan2011.pdf"
Mar 15, 2012
George M. Matthews posted a discussion

What is the state of California's plan to have houses at ZNE by 2020?

Could someone in the know please clarify the State's (law or regs) position on a requirement for houses to be Zero Net Energy by 2020?I see that a Bay Area group has created a roadmap to a clean energy economy that incorporates 25% of Bay area buildings be ZNE by 2020... …See More
Mar 15, 2012
Bruce Navin replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"I am creeped out when crawling around-I keep something in hand to knock down the webs, etc. But the fear of those two is largely overblown. For example, BRS does not use a web, per se; they build more of a cocoon to sleep in & lay eggs(pictured…"
Jan 17, 2012
Patrick Michaelyan replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"Take a big shot of "hope for the best" and go to it.  I also set up a series of shop lights before I really go at it. I take a quick look into the crawl in order to determine whether this day may be my last or…"
Jan 17, 2012
Craig McManus replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"How do you keep the brown recluse and black widow spiders from biting you in the crawl space?"
Jan 16, 2012
Patrick Michaelyan replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"Amen to that Glen. I am one of those geeks that relishes in the chance to get dirty in a crawl space. While you're in those crawl spaces I recommend beefing up the insulation in the floor in addition to sealing and insulating the ducts or…"
Jan 16, 2012
Glen Gallo replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"I think it must be a case by case evaluation. In most cases I think you will find it cheaper and more effective to simply replace the existing duct work.. As far as the economic argument is concerned simply get it bid both ways…"
Jan 16, 2012
Patrick Michaelyan replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"I am going to read the LBL report soon, but my sense for this is that you should keep the existing ductwork (assuming it is sheet metal) rather than replace it with insulated flexduct. If the ducts are accessible (and I do understand that this is…"
Jan 16, 2012
Craig McManus replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"In a humid climate in a crawlspace if there is a tear in the outer plastic then water condenses in the duct  insulation so then it might be better to replace with new flex duct. Is there an easy way to reinsulate existing duct and make the…"
Jan 16, 2012
Bob Blanchette replied to George M. Matthews's discussion To replace old leaky ducts with new flex ducts or to seal the old with mastic?
"If it's UNDER the house I'd keep the metal stuff. Critters LOVE flex !!"
Jan 14, 2012

Profile Information

Company
Home Energy Retrofit
Professional Certification
Building Energy Analyst
Professional Interests
Comprehensive energy retrofits. Building a successful business providing energy efficiency and home renovation services to home owners.
Model making
Passive House, Zero Net Energy Houses
Website URL
http://www.homeenergyretrofit.com
Facebook Page
http://www.facebook.com/#!/pages/Walnut-Creek-CA/Home-Energy-Retrofit/144215608943594
LinkedIn Profile
http://www.linkedin.com/profile/edit?id=44699960&trk=hb_tab_pro...

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"Nate, RE: Duct test On my own home and a rental I have tested more than once over the last many…"
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Jim Gunshinan commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"Thanks for all the comments. Yes, it is interesting how the duct leakage grew over the years. Maybe…"
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Ed Minch commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"What sort of energy bill do you have now, what is  your target bill, and what will it cost to…"
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Glen Gallo commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"It is curious to see a 15% difference in the duct test from the test out of 2007 to the current…"
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John Proctor commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"So Jim, any idea as to how your ducts sprung another 15% leakage between 2007 and 2014? You also…"
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