Hans Joachim Preiss
  • Male
  • Boulder, CO
  • United States
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Latest Activity

Hans Joachim Preiss replied to Bud Poll's discussion Basing air exchange on house volume??
"The type and concentration of pollutants very much depends on the people living in the home. One family may use only zero VOC paints and cleaners, another family doesn't pay attention to what they buy. One family may be only two adults, another…"
Jan 7
Hans Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"We should mention that Transformations' homes in MA have 12" Double Studded R-45 Low Density Foam Walls and typically not a lot of glazing. An 1,800 sqft home may have two mini-splits on the first floor and one on the second…"
Feb 24, 2014
Hans Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Quality of life is very important to me, and I am trying to convince my customers that 'you get what you pay for'. But each their own and I don't think we're adding value to James' question above. Cheers!"
Feb 23, 2014
Hans Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"James wrote 4800 HDD, which I would not consider a mild climate. Super insulated homes can achieve heat loads so low instead of a geothermal vertical well a slinky can be installed under the foundation at very little cost bringing the price for…"
Feb 23, 2014
Hans Joachim Preiss replied to James Murray's discussion Ductless Heat Pump vs Radiant
"Do you have any need for cooling or dehumidification? If you don't, I don't see that this would be an application for a ductless heatpump.   You're correct that radiant will not create a temperature gradient between floor and…"
Feb 20, 2014
Hans Joachim Preiss commented on Brian Brainerd's blog post Is the Nest Learning Thermostat Disruptive Technology?
"Hardly anybody thought of their thermostat as being dumb and unattractive before NEST showed up. Many people thought thermostats could be improved and that their user interfaces were stuck in the stone age, but not many worked on improving them -…"
Jan 24, 2014
Hans Joachim Preiss commented on Brian Brainerd's blog post Getting Out the Message on Home MPG
"That's absolutely where we need to get to in order for energy efficiency improvements to pay off when selling the home. But currently there are so many ways to cheat. E.g. when I know I'll be selling my house next year, I'll turn the…"
Jan 17, 2014
Hans Joachim Preiss joined Tom White's group


Share your concerns and successes as a weatherization professional, or information for this community.
Dec 3, 2013
Hans Joachim Preiss joined Sean Lintow Sr's group

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what needs to find it's way to the dust bin of history?See More
Dec 3, 2013
Hans Joachim Preiss joined Diane Chojnowski's group

Hall of Shame

In this group, members share an array of images from the field, showing the kinds of issues encountered by home performance professionals in real homes. Each tells a story of how hidden (but fixable) problems in homes can cause high energy bills.
Dec 3, 2013
Hans Joachim Preiss joined Allison A. Bailes III's group


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
Dec 3, 2013
Hans Joachim Preiss replied to Johnny Ritzo's discussion Selecting a Water Heater
"Could it be that you have a boiler with tankless coil? Boilers are for hydronic heating, furnaces are for forced air heating. Is this a single family residence? Will you live in it or rent it out? Year round use? How many bathrooms, fixtures, what…"
Jun 8, 2013
Joachim Preiss just added their location.
Nov 12, 2010
Hans Joachim Preiss updated their profile photo
Nov 12, 2010
Hans Joachim Preiss is now a member of Home Energy Pros
Nov 3, 2010

Profile Information

BrightSense LLC
Professional Interests
Net-zero Building Engineer
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Latest Activity

Dennis Heidner replied to Patrick Michaelyan's discussion Vinyl Siding with Integral Insulation
"The observation about rot is important.   I agree. One of my complaints with some of the…"
9 minutes ago
Jennifer Schenk added a discussion to the group Job Board

Job Opening - Energy Programs Manager - Frisco, CO

Energy Programs Manager - High Country Conservation CenterJob DescriptionGeneral Description of…See More
2 hours ago
Jennifer Schenk joined Diane Chojnowski's group

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
2 hours ago
Avi Yashchin posted a status
""Will Online Learning Replace the Classroom?" Read my full article on HuffPost. http://huff.to/1cNCOie"
2 hours ago
Profile IconTerrell, Jennifer Schenk, Amina Lang and 3 more joined Home Energy Pros
4 hours ago
Patrick MacRoy commented on Melissa Ulbricht's blog post How to Optimize On-Bill Financing to Help Illinois Building Owners Invest in Energy Efficiency
"Many of these recommended improvements are included the Clean Energy Jobs bill recently introduced…"
7 hours ago
Susan E. Buchan posted a status
"EEBA 2015 Conference Call for Papers extended! New deadline: 3/6/15 at 5 PM CT Submission details: www.eeba.org/conference/call-for-papers"
7 hours ago
Casey Gesell replied to Casey Gesell's discussion Looking for home improvement companies to join our dealer network!
"Hi Patrick, What is your time frame for relocating? Would you be interested in operating in the…"
9 hours ago

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