John C. Semmelhack
  • Charlottesville, VA
  • United States
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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
John C. Semmelhack replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"By the way...not sure what climate you're in, but someone should probably should insulate that fresh air duct!"
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

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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

Mini split air conditioners and ceiling fans

Started by Beverly Lerch in General Forum. Last reply by Daniel Baur-McGuire yesterday. 4 Replies

DIY Filter Solution for an Evaporative Cooler, anyone?

Started by Leslie Jackson in HVAC. Last reply by Daniel Baur-McGuire yesterday. 6 Replies

VERY TIGHT HOME WITH OVER SIZED AC

Started by Jerry Needham in BPI. Last reply by Tim O'Brien yesterday. 5 Replies

Apply now for the Jon Siemen Memorial Scholarship!

Started by Diane Chojnowski in General Forum. Last reply by Quinn Korzeniecki on Thursday. 1 Reply

Log home roof insulation

Started by Bob Reuther in Best Practices. Last reply by Bob Reuther Aug 7. 10 Replies

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Diane Chojnowski's video was featured

1950s Home Retrofit to Super Efficient Passive House - Urban Green Building

This 1950s Montreal house was retrofitted to become a super efficient passive house by adding a 16 inch thick layer of cellulose insulation to the exterior. Maison Ozalée's builder, Richard Price from Construction Le Tournesol, also used triple…
yesterday
Diane Chojnowski posted a video

1950s Home Retrofit to Super Efficient Passive House - Urban Green Building

This 1950s Montreal house was retrofitted to become a super efficient passive house by adding a 16 inch thick layer of cellulose insulation to the exterior. ...
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Daniel Baur-McGuire replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Running a ceiling fan actually heats up air. Allison Bailes has some great articles on it.  I…"
yesterday
Daniel Baur-McGuire replied to Leslie Jackson's discussion DIY Filter Solution for an Evaporative Cooler, anyone?
"Where are the supply runs located? Look to make sure supply runs are sealed. I would second having…"
yesterday
Tim O'Brien replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"New build may not have been "dry" before finished and occupied. Residual moisture from…"
yesterday
Daniel Baur-McGuire replied to Jerry Needham's discussion VERY TIGHT HOME WITH OVER SIZED AC
"Oversized A/C systems wont pull out enough moisture from the conditioned air. I would check to make…"
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Laurie DiDonato posted a blog post

HERS Rater Training Discount ($200) Ends August 20th!

Online: September 17-28th (Times TBA)Classroom: October 1-5th in Manchester, NHFull fee: $2595…See More
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Franco Oyuela commented on Fresh Air Duct Cleaning's blog post Moving in to a new home and why you should get a Duct Cleaning
"There is no evidence to suggest that clean ducts leads to better overall health. However, it should…"
Friday
Franco Oyuela replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Using a ceiling fan as part of a team to bring your maximum home cooling comfort. Adding a ceiling…"
Friday
Beverly Lerch replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Thank you.  Good information about the ceiling fans."
Thursday

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