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

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."
Monday
John C. Semmelhack posted a discussion
Monday
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
John C. Semmelhack replied to Jack Baikoff's discussion Measuring fresh air intake ducted to a return and no way of measuring from outside.
"There are in-duct measurement techniques that are accurate enough for this purpose. Here's what I use - http://www.kele.com/flow/fxp-series.aspx It's essentially an "averaging" pitot tube to take care of the likely…"
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.
"Why are you wondering how much airflow occurs at this intake?   1) Required for Energy Star 3.0 certification 2) Code compliance 3) Ensure there's enough airflow to help ensure healthy indoor air quality 4) Ensure there's not too…"
Jan 24, 2013
John C. Semmelhack replied to Curt Kinder's discussion AirGenerate Heat Pump Water Heaters - any experience?
"Dan,  Good to hear you're evaluating the reduced airflow form the CAR's. I'm interested to see the results.  Regarding the discharge airflow - comfort issues are relatively easy to mitigate with location, placement and…"
Nov 20, 2012
John C. Semmelhack replied to Curt Kinder's discussion AirGenerate Heat Pump Water Heaters - any experience?
"Dan,  Have you measured the drop in efficiency/capacity caused by reducing the airflow?  Why are you recommending exhausting the discharge outside of the house?  John "
Nov 16, 2012
John C. Semmelhack commented on Roch Naleway's blog post Borrowing from solar thermal system - Why not use two tank systems with heat pump water heaters?
"Are you kidding me? That's the worst thing I've heard all month. Cutting the airflow across the heat exchanger of a heat pump system by 50-60% will significantly reduce capacity and efficiency. I'm glad I'm not a rate-payer in…"
Sep 13, 2012
John C. Semmelhack commented on Roch Naleway's blog post Borrowing from solar thermal system - Why not use two tank systems with heat pump water heaters?
"The ATI-50 and ATI-66 have a 6" diameter discharge collar on the top of the unit that can be ducted in the case of installations in small spaces. In the particular scenario I've been discussing, the discharge is ducted about 15' over…"
Sep 13, 2012
John C. Semmelhack commented on Roch Naleway's blog post Borrowing from solar thermal system - Why not use two tank systems with heat pump water heaters?
"The ATI-66 for the seven-person household is in conditioned space (hallway closet between kitchen and living room), so the ambient temperature is pretty consistent. I'm sure HPWH's have a harder time keeping up with demand in colder months…"
Sep 13, 2012

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

 
 
 

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