John C. Semmelhack's Discussions (18)

Discussions Replied To (16) Replies Latest Activity

"Yes...this test should be done at the highest fan speed (without messing with the in…"

John C. Semmelhack replied Oct 1 to How to measure room pressures

20 Oct 5
Reply by John Proctor

"Mitsubishi has a refrigerant-to-water heat exchanger in their City-multi VRF lineup,…"

John C. Semmelhack replied Jun 13 to GSHP for domestic hot water

4 Jun 28
Reply by Eric Kjelshus

"I agree with David Butler...it really depends on the inputs into the model as well a…"

John C. Semmelhack replied May 19 to HERS score with HRV

9 Jun 7
Reply by Nicholas Burger

"From the article: "Lynae Forbes, president and principal broker at Hasson Company Re…"

John C. Semmelhack replied May 10 to Portland home energy scores not so hot

4 May 10
Reply by tedkidd

"I agree with David. All of the tightest houses I've tested have used Therma-tru door…"

John C. Semmelhack replied May 2 to Fire Rated High Performance Doors

3 May 2
Reply by John C. Semmelhack

"I've tried out most of the available residential energy monitors over the years and…"

John C. Semmelhack replied Jan 9 to Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee

25 Oct 8
Reply by Dav Camras

"https://retrotec.com/products/flow-finder-mk-2-best-powered-flow-hood "

John C. Semmelhack replied Oct 24, 2017 to Replacement for Energy Conservatory Flow-blaster

1 Oct 24, 2017
Reply by John C. Semmelhack

"For multi-split systems from the quality manufacturers, plan on roughly $2,500-3,000…"

John C. Semmelhack replied Feb 12, 2015 to Whole-house Ductless Mini-split install costs

6 Jun 29, 2015
Reply by Robert Bass

"Graham, The U.S. is catching up to Germany very quickly on solar installs. As of the…"

John C. Semmelhack replied Oct 23, 2014 to How does efficiency factor into a grid parity world?

5 Oct 26, 2014
Reply by Bob Blanchette

"HVAC contractor (ideally) drills the 1" hole, then tapes over afterward.  I investe…"

John C. Semmelhack replied Jan 24, 2013 to Measuring fresh air intake ducted to a return and no way of measuring from outside.

22 Feb 7, 2013
Reply by Dale Sherman

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Latest Activity

Scott Katznelson replied to Jerry Needham's discussion Blower door test for small apartment building
"Most of the work I do is retrofit of older buildings. Marriage wall leakage is often significant,…"
4 hours ago
John Nicholas replied to Jerry Needham's discussion Blower door test for small apartment building
"Scott Katznelson   In 2013,  I had my HERS Field Review completed on a multi-family…"
4 hours ago
Sean Lintow Sr replied to Jerry Needham's discussion Blower door test for small apartment building
"Sorry but LMAO - one blower door for that small of a space gives you an accurate number for the…"
5 hours ago
Chris Davis posted a blog post
6 hours ago
Scott Katznelson replied to Jerry Needham's discussion Blower door test for small apartment building
"The most accurate way to accomplish this is to have 4 blower doors running at the same time, one…"
9 hours ago
Brett Little posted a discussion

Tour 2 IL New Built Homes - 1 LEED Silver - 1 Zero Energy Ready

During the IL Green Built Home Tour, we looked at 2 homes right down the road from each other to…See More
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Jan Green commented on Pearl Certification's blog post Two National Brands Join Forces Demonstrating Unity in Home Energy-Efficiency Rating Systems
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11 hours ago
Rob Salcido replied to John Nicholas's discussion Reference Homes for Rating Comparison in the group Home Energy Ratings
"Hello John, Look under the Help Menu in REM/Rate and you should see a "UDRH Syntax…"
12 hours ago
Rob Salcido joined Evan Mills's group
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Home Energy Ratings

Calculating them; visualizing them; explaining them; selling them .... there is a lot to discuss…See More
12 hours ago
Corbett Lunsford's video was featured

“Airtight" Buildings Debunked by Chemistry

I've been telling people that the 475 High Performance Building Supply membranes I build with are airtight but vapor open for years. Turns out, sometimes I'm an idiot. Here's the real deal. Featuring Delphine Farmer and Marina Vance of the HOMEChem…
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