John C. Semmelhack
  • Charlottesville, VA
  • United States
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Latest Activity

John C. Semmelhack replied to Randall Olsen's discussion How to measure room pressures
"Yes...this test should be done at the highest fan speed (without messing with the installer's speed tap settings) with all bedroom doors closed. With air handlers that have different speed settings for heat vs. cool, you should choose the…"
Oct 1
John C. Semmelhack replied to David Holtzclaw's discussion GSHP for domestic Hot water
"Mitsubishi has a refrigerant-to-water heat exchanger in their City-multi VRF lineup, but you have to add an additional heat exchanger (probably in the tank) to move the heat from Mitsubishi's non-potable rated heat exchanger into the potable…"
Jun 13
John C. Semmelhack replied to Robert Bean's discussion Low velocity consequences in the group Kitchen Ventilation
"I'm not familiar with any recommended minimum velocity for residential range hood exhaust ductwork. I suspect that long-term grease deposition in the ducts is minimal for most residential applications, given the intermittent use of the cooktop…"
Jun 7
John C. Semmelhack liked Diane Chojnowski's discussion Everything you need to know about California's new solar roof mandate
May 25
John C. Semmelhack replied to Gary Hall's discussion HERS score with HRV
"I agree with David Butler...it really depends on the inputs into the model as well as the efficiency of the HRV. There's a big range of heat transfer and fan motor efficiency in the HRV/ERV world. If the ASHRAE 62.2-2013 ventilation rate…"
May 19
John C. Semmelhack replied to Diane Chojnowski's discussion Portland home energy scores not so hot
"From the article: "Lynae Forbes, president and principal broker at Hasson Company Realtors, said her industry is still facing some challenges with the new mandate. From what she's heard from her brokers, large houses are prone to low…"
May 10
John C. Semmelhack liked Diane Chojnowski's discussion Portland home energy scores not so hot
May 10
John C. Semmelhack replied to Andy Wahl's discussion Fire Rated High Performance Doors
"I agree with David. All of the tightest houses I've tested have used Therma-tru doors (including a fire-rated door to garage in a couple of houses) and we've seen near-zero noticeable leakage around the doors when properly installed,…"
May 2
David Butler replied to John C. Semmelhack's discussion ACCA: Call for Volunteers to Aid the Development of a New Design Manual for Low-Load Homes
"It's about damn time."
Apr 16
John C. Semmelhack posted a discussion
Apr 16
John C. Semmelhack replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"I've tried out most of the available residential energy monitors over the years and am satisfied with none of them. The ones that monitor just a single circuit don't provide enough detail, the "learning" devices (such as Sense)…"
Jan 9
John C. Semmelhack replied to Blake Shurtz's discussion Replacement for Energy Conservatory Flow-blaster
Oct 24, 2017
John C. Semmelhack joined Allison A. Bailes III's group
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HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More
Oct 1, 2017
John C. Semmelhack replied to Rob Buchanan's discussion Whole-house Ductless Mini-split install costs
"For multi-split systems, plan on roughly $2,500-3,000 per indoor "head"....on the lower side if it's 4-5 heads...on the higher side if it's just two heads. This will also vary up or down up to $500 per head depending on if…"
Feb 12, 2015
John C. Semmelhack replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"Graham, The U.S. is catching up to Germany very quickly on solar installs. As of the end of 2013, the Germany-to-U.S. cumulative installed solar capacity ratio was about 2.6 to 1. At the end of 2014, it will be closer to 2 to 1. The U.S. will likely…"
Oct 23, 2014
John C. Semmelhack replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"HVAC contractor (ideally) drills the 1" hole, then tapes over afterward.  I invested about $250 for 4", 5", 6", 7" and 8" versions of the device. "
Jan 24, 2013

Profile Information

Company
Think Little
Professional Certification
Certified Passive House Consultant, HERS Rater, EarthCraft Virginia Technical Advisor, BPI Building Analyst
Website URL
http://www.think-little.com
Blog URL
http://www.think-little.com

Comment Wall (1 comment)

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At 4:19pm on October 11, 2011, Diane Chojnowski said…

Hi John,

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

 
 
 

Forum Discussions

ENERGY STAR Version 3

Started by Allison A. Bailes III in General Forum. Last reply by Mandy Leazenby 16 minutes ago. 10 Replies

Blower door test for small apartment building

Started by Jerry Needham in General Forum. Last reply by John White on Friday. 9 Replies

Radiant Barrier Southeast

Started by Gary Wright in Best Practices. Last reply by yassin chahdi on Thursday. 6 Replies

Latest Activity

Mandy Leazenby replied to Allison A. Bailes III's discussion ENERGY STAR Version 3
"I've only ever worked on Energy Star with Habitat for Humanity.  But we have very few…"
16 minutes ago
Colin Genge is now a member of Home Energy Pros Forum
1 hour ago
Brett Little posted a discussion

How to become a Certified GreenHome Professional - Free Webinar!

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Corbett Lunsford's video was featured

Testing Air Quality with Your Nose: Control Your HOMEChem

Charlie Weschler sits down with Grace and Corbett and gives fascinating examples of the complexity of indoor air chemistry. He is an air quality legend, a professor on three continents, and a super nice guy.
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Profile Iconwallace van, Tony kroos and Sunmar Construction, Inc joined Home Energy Pros Forum
Friday
John White replied to Jerry Needham's discussion Blower door test for small apartment building
"Well, I think it completely depends on the purpose and requirement of the test. Testing one unit in…"
Friday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"I can use my Duct Blaster on any house that I expect to be less than 1300 CFM through the…"
Friday
Sean Lintow Sr replied to Jerry Needham's discussion Blower door test for small apartment building
"FYI, he is in Illinois where code is 5 (well up until March as noted when it drops to 4)  Heh…"
Friday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"Here are two pictures of the duct blaster fan as a blower door.  1 in a door and 1 in a…"
Thursday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"What standard are you testing to? Energy Star requires 5 ACH @ 50.   Code is 3.0 etc…"
Thursday
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"What standard are you testing to? Energy Star requires 5 ACH @ 50.   Code is 3.0 etc…"
Thursday
Franco Oyuela replied to Allison A. Bailes III's discussion ENERGY STAR Version 3
"The ENERGY STARnew homes program has been around since the mid-1990s and is currently undergoing…"
Thursday
Blake Reid commented on Blake Reid's blog post Managing Mold & Humidity (in Hawaii)
"Thank you very much! They're actually the same, though - the one with the dehu cover photo has…"
Thursday
John Proctor commented on Blake Reid's blog post Managing Mold & Humidity (in Hawaii)
"Nice post -- much better than the one that only showed the dehumidifier."
Thursday
Brett Little updated an event
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Full Circle Urban Forestry: Introducing Urban Wood Opportunities - Free CE Webinar at Webinar Online

December 5, 2018 from 12pm to 1:15pm
Many common urban tree removal practices in the United States view felled urban trees as costly…See More
Thursday
Brett Little replied to Brett Little's discussion Virtual CEU Tour of the Pembroke Passive Solar Zero Energy Ready Home
"You know utilities are pretty complex, especially in IL, however it looks like just about 6.8 cents…"
Thursday
yassin chahdi replied to Gary Wright's discussion Radiant Barrier Southeast
"It’s hard to choose on of these as most of the time the reviews and buying guides found on…"
Thursday
Bruce Fillmore replied to Mark Furst's discussion Bath fan weirdness
"In my opinion venting into any soffit is a bad idea, it usually requires a sharp bend to get into…"
Thursday
Tray Biasiolli replied to Mark Furst's discussion Bath fan weirdness
"I'd agree with Sean - we get wind effects regularly when measuring ventilation fan intake at…"
Thursday
Charles Buell replied to Mark Furst's discussion Bath fan weirdness
"You would have to test the vent at the inside at a location the same diameter as the outside…"
Thursday

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