All Blog Posts (1,434)

Assessing long-term PV performance in a low-energy home

Zero Energy Home Friends,

My daily PV output from a 6.56 kW PV system has averaged 22.7 kWh/day over the last two years.

kWh= AC kWh from inverter to grid

irrday= cumulative kWh/m2/day plane of array

pvptmp= array temperature (F) taken on back on one of the modules

obs= elapsed…

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Added by Danny S. Parker on August 17, 2014 at 3:55am — No Comments

Jeremy Draper & the Craiglist Adventure

RaterFest! has many traditions... Bon-fires, Rater Jams, Rater Olympics, Colorado Craft Beers...

Perhaps one of the less well known, but dearly loved, is the tradition of Raters sharing stories about their own homes.

This year we are excited to have Jeremy Draper, who will tell his unique story of building his first home using as much recycled or re-used materials as possible.  He is nothing short of a Craiglist master.…

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Added by Hannah Finch on August 13, 2014 at 3:00pm — No Comments

No Bubbles, No Troubles!

Or is there? This saying is an old adage in our industry to let the technician know that the refirgerant charge is "all set". You see, there must be a steady stream of liquid to the metering device for it to function properly. For sake of conversation, let's use the TXV. In order for most TXV's to throttle and correctly maintain the desired Superheat, there must be a minimum of 2F of subcooled liquid at the valve (not where it is measured, near the condenser). If the liquid were to flash off… Continue

Added by Christopher Morin on August 12, 2014 at 4:19pm — No Comments

Casa Automatica - Aiming for Zero consumption in acclimatization

Hi there, I'm new here. Not sure if this make sense here. But for sure, you will tell if it's not. 

I'm Portuguese, I've 47 years old, 3 children, and spent the last 3,5 years of my life on a project I've called Casa Automatica.

The project started by being just an home control system, where I've tried to combined some security features, water control and home network, in a package, using and sharing an internet connection. The system is presented here…

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Added by jose caramelo on August 11, 2014 at 6:30pm — 7 Comments

FALL FAST TRACK to Revolutionize Home Performance Business, Rock the Houses on Sept 1 2014

You took a class, or read a book, got BPI or HERS Rater certified, or just bought some diagnostic equipment. Your company was heading in the right direction in the beginning, but NOW WHAT? Earning certifications and owning diagnostic tools is a step in the right direction, but it’s only a step… the real power of your home performance focus is in practicing what you preach with testing on every job, and using it to…

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Added by Corbett Lunsford on August 9, 2014 at 2:01pm — No Comments

The One Month Countdown to RaterFest! has Begun!

RaterFest! (September 5-7) is less than one month…
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Added by Hannah Finch on August 8, 2014 at 5:30pm — No Comments

Announcing BPI Infiltration and Duct Leakage Certification

On August 4th, the Building Performance Institute (BPI) announced a new certification focused specifically on blower door and duct blaster concepts. The announcement came during a monthly meeting for approved BPI Test Centers. The official announcement is slated to come soon. BPI Infiltration and Duct Leakage, or BPI IDL for short, will be a standalone certification that emphasizes proper handling of energy auditing equipment - and you heard it here…

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Added by Everblue Training on August 7, 2014 at 10:00am — No Comments

Help Wanted in Park Ridge, IL

General Labor/Painting/Building Maintenance Position. Some construction knowledge is preferred. Priority Energy is a leading energy solutions companies. 1.800.737.2299

Added by Robert Schildgen on August 6, 2014 at 5:04pm — No Comments

Learning Applied Building Science is Still Hard to Do

As part of Home Energy’s 30th birthday celebration, we are pleased to reprint a 1994 article by Michael Uniacke describing the way he taught building science in a community college (see the article here). Mastering the intricacies of the building science related to energy performance is no…

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Added by Home Energy Magazine on August 6, 2014 at 11:40am — 4 Comments

Stump Duncan, Innovate with Colby, and Save on RaterFest! 2014

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Added by Hannah Finch on August 2, 2014 at 12:00pm — No Comments

12 Things Every Home Performance Contractor Should Have on Their Work Truck

Every home is unique and differs from the last. It would be a perfect world (from a project planning standpoint) if every home were a cookie cutter from the previous install, however this is not always the case. I have been in the construction industry doing remodeling and even building new residential homes for over 25 years. Along the way I have run into some interesting situations in which I was not prepared and wished I was. Although this has been sometimes fun and challenging at times,…

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Added by Brandon Walton on July 27, 2014 at 3:19pm — 2 Comments

Small Businesses: Diversify with Infrared Thermography Services, Save Your Business, Save the Country...

HERS should all offer Infrared Thermography Services.

It is all ways great advice for small businesses to diversify, I know it pulled our company through a recession and is solely responsible for us coming up on our 20th year in business. With home improvement companies and electrical contractors, the advantages of being a Certified Infrared Thermographer go far beyond diversifying the small business…

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Added by Don Fitchett on July 24, 2014 at 10:07pm — No Comments

Technical Tape Desecration

Lets face it – building science is pushing the performance of adhesive tapes to a new levels and though I can’t profess to have my daughters’ ability in making fashionable duct tape purses,  I have been know to mis-apply good tape to get me out of a bind! I think Red Green would be impressed!

If you send me your photos, I…

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Added by Greg Labbe on July 22, 2014 at 11:33am — 1 Comment

How do You Test a TXV?

  Thermostatic Expansion Valves (TEV or TXV), one of the most popular metering devices for residential, high-efficient air conditioning and heat pumps, have performed almost impeccably for decades.  Unfortunately, some manufacturers in the past few years have identified batches of valves that have had high superheat issues.  Have we just been blind for so long, not realizing these problems existed?  Or have these valves really been so reliable for such a long time?

  If you think you…

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Added by Christopher Morin on July 21, 2014 at 9:30pm — 3 Comments

What is your opinion about members promoting products here?

Hello,

I am a whole house fan and attic ventilation expert in Temecula CA. I started studying whole house fans in 2008 when my wife, Darlene, and I moved from Manhattan Beach. I would really like to share my knowledge with all of you but I want to be sure I don't antagonize you with more commercialization than you want. Please let me know your opinion and if you can, send me some examples of acceptable blogs and unacceptable ones. 

Added by Kurt Shafer on July 18, 2014 at 12:02pm — 11 Comments

Please, Make the Transition!

  For as long as I can remember, the agreed epidemic with ductwork was always undersized return ducts.  Although we are far from perfect with duct sizing in New England, I have frequently seen great strides in fixing this issue - particularly with replacement systems.  Lets face it, you should just be properly designing the duct system on new installations.  Undersized ducts cause great restrictions in airlfow, raising…

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Added by Christopher Morin on July 17, 2014 at 8:29pm — No Comments

Lessons from Energy Efficiency Advisors: Getting Homeowners Onboard with Home Performance

Homeowners are often aware of the different problems they experience in their homes: uncomfortable rooms, high utility bills, poor indoor air quality, etc. However, homeowners are generally unfamiliar with the concept of Home Performance, the Whole House approach, and how energy efficiency upgrades can address these concerns. We regularly hear these stories and find that by listening, asking the right questions, educating, and providing guidance, we can help homeowners feel…

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Added by Scott Mellberg on July 16, 2014 at 1:29pm — 13 Comments

It's Hard to Beat Earning 12 RESNET CEUs in the Rockies

Want an excuse to spend a weekend in the Rocky…

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Added by Hannah Finch on July 10, 2014 at 3:10pm — No Comments

My Energy Upgrade California—The Numbers Are In

Here are the final numbers for my Energy Upgrade California home retrofit.

Table 1. Air…

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Added by Jim Gunshinan on July 10, 2014 at 2:30pm — 26 Comments

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