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

John C. Semmelhack replied to Alan Lehman's discussion Ducted mini split vs ceiling cassettes?
"That air handler (PEFY...) is only 10-inches thick...I'm not getting why this would require you to dig down 5-ft. Side note - that's a 2.5-ton air handler for 1,150sf. Seems pretty big, unless you have a whole lot of window area. "
Feb 21
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, 2018
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, 2018
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, 2018
John C. Semmelhack liked Diane Chojnowski's discussion Everything you need to know about California's new solar roof mandate
May 25, 2018
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, 2018
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, 2018
John C. Semmelhack liked Diane Chojnowski's discussion Portland home energy scores not so hot
May 10, 2018
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, 2018
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, 2018
John C. Semmelhack posted a discussion
Apr 16, 2018
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, 2018
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

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

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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

 
 
 

Latest Activity

Brett Little posted an event
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How to use the Home Water Score - Free CE Webinar at Webinar Online

March 20, 2019 from 12pm to 1:15pm
The home water score (v1) is here and can be used now to make more informed and strategic decisions…See More
2 hours ago
Don Fugler replied to Don Fugler's discussion Difficult retrofits in the group Kitchen Ventilation
"So here is my first report (after which I will wait until I have multiple trials). I am trying to…"
2 hours ago
Tommie John replied to Tommie John's discussion Blower Door and Duct Blaster! in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"You can reach me at 281-310-0258 directly "
3 hours ago
Tommie John replied to Tommie John's discussion Blower Door and Duct Blaster! in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Email me directly at tommiejohn123@aol.com. We can discuss the next steps thru email."
3 hours ago
Frank Hebert replied to Tommie John's discussion Blower Door and Duct Blaster! in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"I'm interested. What do we do next?  I need to talk to you.  "
3 hours ago
Franco Oyuela replied to Rob Madden's discussion Determining Duct Leakage based solely on blower door and pressure pan testing
"Duct basics: Duct leaks are very common; in many homes, duct leaks are responsible for significant…"
4 hours ago
Tommie John replied to Tommie John's discussion Blower Door and Duct Blaster! in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"No, it’s still available "
4 hours ago
Tommie John replied to Tommie John's discussion Blower Door and Duct Blaster! in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"No, it’s still available "
4 hours ago

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