Design Around People. A Good Building Follows.

Blog

Read more about a range of building science, engineering, and architecture topics on our company blog.

Why Heat Pump Water Heaters?

Heat pump water heaters (HPWHs) are a compelling choice over traditional gas water heaters. They are a reliable, mature, and highly efficient technology offering 300-550% energy efficiency compared to gas's 96%. The continued use of fossil fuels for water heating is an outdated practice driven by past industry influence and builder preference, highlighting the shift towards renewable electricity and the environmental benefits of HPWHs. Ultimately, gas water heating is an obsolete technology with long-term environmental costs, and we need a forward-thinking approach that embraces HPWHs and prepares for a future where fossil fuels are less economically viable.

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Ductwork for a Retrofit ERV

We have had a number of customers ask for energy recovery ventilation (ERV) in their existing homes. Can we use the existing furnace ductwork? If not, what size and type of ducts can be used?

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The Campsite at Shield Ranch

The Campsite at Shield Ranch was designed by our friends at Andersson / Wise. It is a 100% off-grid community designed to engage and celebrate the natural context of the ecologically diverse 6800-acre hill country sanctuary where it sits. The camp features an open-air pavilion, screened shelters, and miles of hiking trails just 22 miles from downtown Austin. Positive Energy was hired to perform MEP engineering, solar design and engineering, and Resilient Systems consulting. The Resilient Systems we master planned for the program include a 64kW architecturally integrated solar array, a 200kWh (100kW peak power capacity) backup battery array, a 60kW emergency propane genset, and we consulted with another rainwater system engineer a couple of 60k gallon rainwater collection tanks for occupancy use with TECQ compliant filtration for public consumption (as well as necessary rainwater storage for fire suppression).

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What Does The ChatGPT AI Know About Building Science

As I lay in bed last night thinking, I decided to finally try out the ChatGPT language AI that has been so widely covered in the news of late. By all accounts, it is known to produce compelling and fluid writing and will only continue to improve as it is developed. In particular, I wanted to see how it would make sense of the topic of building science. Building science is one of those terms that gets flippantly bandied about these days, mostly inaccurately (that’s a different essay for another day), and I thought an AI’s take might be illuminating. After all, this intelligence is scouring the vastness of the internet for the most relevant content to the user/questioner’s prompt. Would my prompts deliver content that hovers at a surface level understanding of building science or perhaps offer deeper insights?

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Positive Energy
Interview Questions For Architecture Firms

We surveyed the Positive Energy staff and asked them what questions they would ask an architect if they were looking to have a custom home designed. The results naturally drifted into three categories: 1. Ethos, it’s important to find an architecture firm that fits your worldview and interests; 2. Process, an architect who can clearly articulate how the design process works and why it works that way can go a long way in preventing unwanted surprises that emerge late in the game; and 3. Technical, there’s no way around the fact that an architect who knows how to deliver a high performing building is engaged in both the aspects of form and function as interlocking features of design.

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Positive Energy
The Fine Homebuilding Interview: Kristof Irwin

By Aaron Fagan, Kristof Irwin, originally published in The Fine Homebuilding Magazine, Issue 300 - July 2021

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Building Science: A Vision For The Future

Building Science is a discipline that is more popular now than it has ever been since its inception. There are several reasons for the newfound popularity, from a growing research body to broader public appeal as media channels proliferated the information landscape. The discipline moved from relative obscurity into the edges of popular culture in a short time. As more and more people consume content about various enclosure or space conditioning products, it is critical that we as professionals and human beings take a step back and remind ourselves what we’re doing and what the function of building science is in this industry and in our larger global society.

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Positive Energy
Congress Slipped Important Climate Legislation Passed You

Possibly one of the most significant climate issues pertaining to the built environment was addressed during the final days of the Trump administration. Yes, you read that correctly. It’s been a weird last few years and in accordance with that strangeness, Congress managed to quietly slip into the recent pandemic relief bill one of the most important pieces of climate-focused legislation in at least the last 4 years, signed into law by former president Donald Trump. A nice, albeit odd, overture to the Biden administration announcement that the US will rejoin the Paris climate agreement, wouldn’t you say? So while you waited for your $600 check, this new law began to turn the wheels of regulatory change for a good swath of the manufacturing industry and will no doubt impact the AEC industry as well.

But what exactly got passed?

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Positive Energy
Environmental Design: Where Art & Science Intersect

Architectural design exists at the confluence of creativity and data, an intellectual space that presents hard problems to solve. What may be the best path to a high performing building may fall completely flat in the realm of inspiration. The inverse is also true — what may be an incredible feat of creative potential in form may completely lack necessary function. So how do we successfully reconcile the age old question of form and function to create beautiful, uplifting spaces that also perform across a range of metrics that benefit occupant and planet? Enter environmental design.

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Wildfires, SARS-CoV-2, & Portable Room Air Cleaners

If wildfires are to be a more frequent and intensive aspect of life in the US and future pandemics are not out of the question, how do homeowners start addressing their air quality to improve the safety their homes can provide? We’ve heard from many clients, friends, and family members in wildfire affected areas asking questions like this so we thought it was worthwhile to expand our air quality focus beyond just SARS-CoV-2 and provide some meaningful content that can serve wildfire sufferers as well. Enjoy some applied scientific guidance on the topic of portable room air cleaners (or PRACs).

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What Have We Learned About Air Conditioning & The Coronavirus

In an effort to broadly provide resources to our clientele and audience, we’ve written articles on the topics of health precautions for construction job sites and designing for healthy environments while reducing pathogen spread. We’ve released podcast episodes on the impact of ventilation and filtration on virus transmission. But now it’s time to talk about a serious elephant in the room as it pertains to coronavirus spread - air conditioning.

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Construction Site Health Precautions

Despite surging cases in the US, construction has not stopped in most states. As we know, houses and buildings can't be built over a Zoom call. We all need to do all we can to end this period of uncontrolled community spread, particularly on construction jobsites since construction workers have been so hard hit by infections. Like any construction project, there are both quantitative and qualitative requirements of a team to bring a building to life. With these facts in mind, we offer the following list of ways to support the health of your construction team on the jobsite.

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Positive Energy
Heath Effects From Gas Stove Pollution

We just finished reading a recently released by the Rocky Mountain Institute in partnership with Mothers Out Front, Physicians for Social Responsibility, and The Sierra Club about the health and air quality impacts of gas ranges in homes. The results are sadly unsurprising (at least not surprising if you’ve spent any time at all reading about the indoor air quality crisis). Over 40 years of evidence indicates that gas stoves, common in kitchens across the United States, can lead to unhealthy levels of indoor air pollution.

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Positive Energy
Come Back Stronger

Before us is a once in a generation opportunity to rebuild the world. Now is the time for clarity and confident action. Post-COVID, we can choose to build a world that brings public health, both mental and physical, to the forefront of the built environment.  A world where the invisible aspects of architecture that impact our lives move to the front and center of the design process. A world where we recognize the power of collective individual action and we question the true reasons behind our old paradigms.  

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Positive Energy