Three Houston companies ranked on Deloitte's annual list, with two cracking the top 100. Photo via Getty Images

Three Houston companies have made this year’s Deloitte North America Technology Fast 500 list.

The report ranks the fastest-growing technology, media, telecommunications, life sciences, fintech, and energy tech companies in North America. The Houston companies to make the list, along with their revenue growth rates from 2021-2024, include:

  • No. 16 Action1 Corp., a provider of cybersecurity software. Growth rate: 7,265 percent
  • No. 92 Cart.com, a commerce and logistics platform. Growth rate: 1,053 percent
  • No. 312 Tellihealth, a remote health care platform. Growth rate: 244 percent

“Houston’s unique blend of entrepreneurial energy and innovation continues to strengthen the local business community, and I’m thrilled to see Houston companies honored on the 2025 Deloitte Technology Fast 500 list. Congratulations to all the winners,” said Melinda Yee, managing partner in Deloitte’s Houston office.

Action1 is no stranger to lists like the Deloitte Technology Fast 500. For instance, the company ranked first among software companies and 29th overall on this year’s Inc. 5000, a list of the country’s fastest-growing private companies. Its growth rate from 2021 to 2024 reached 7,188 percent.

Mike Walters, president and co-founder of Action1, said in August that the Inc. 5000 achievement “reflects the dedication of Action1’s global team, who continue to execute against an ambitious vision: a world where cyberattacks exploiting vulnerabilities are entirely prevented across all types of devices, operating systems, and applications.”

Atlanta-based Impericus, operator of an AI-powered platform that connects health care providers with pharmaceutical and life sciences companies, topped the Deloitte list with a 2021-24 growth rate of 29,738 percent.

“Our mission is to set the standard for ethical AI-powered physician connections to pharma resources, accelerating and expanding patient access to needed treatments,” said Dr. Osama Hashmi, a dermatologist who’s co-founder and CEO of Impiricus. “As we continue to innovate quickly, we remain committed to building ethical bridges across this vital ecosystem.”

Houston's top startups by valuation range from e-commerce startups to a geothermal pioneer. Photo via Getty Images

Houston’s 10 most valuable startups revealed in new report

by the numbers

The Greater Houston Partnership has released its list of the 10 most valuable startups that are fueling the city’s growth and entrepreneurial energy, including industry giants like Axiom Space and Fervo Energy.

Currently, Houston hosts more than 1,300 startups in industries such as energy, life sciences, manufacturing and aerospace, according to the GHP. The list ranks its top 10 startups by valuation based on the company’s last private funding round, reflected in Pitchbook data, as of Oct. 20 of this year.

The top 10 list includes:

10. NXTClean Fuels

Valuation: $530 million

NXTClean Fuels builds biofuel refineries that produce renewable fuel by using feedstocks like cooking oil and recycled organic materials.

9. Homebase

Valuation: $660 million

HR tech company Homebase provides employee management software that helps manage and optimize timesheets, payroll and more, with over over 100,000 small businesses and 2 million hourly workers using its product.

8. Zolve

Valuation: $800 million

Zolve is a banking platform that provides customers with access to financial products that aim to be accessible, flexible, and affordable than other financial platforms.

7. Stramsen Biotech

Valuation: $807 million

Stramsen Biotech develops plant-based drug therapies that target both infectious and noninfectious diseases, which include cancer, diabetes, HIV, kidney disease and neurological issues.

6. Octagos

Valuation: $843 million

Healthtech company Octagos has developed a remote cardiac monitoring software driven by AI that helps consolidate patient data in real-time, assisting healthcare professionals in providing quicker, easier and more accurate care.

5. Fervo Energy

Valuation: $1.4 billion

Pioneering geothermal company Fervo Energy combines horizontal drilling and fiber-optic sensing to produce electricity. The company is developing its flagship Cape Station geothermal power project in Utah. The first phase of the project will supply 100 megawatts of power beginning in 2026

4.Cart.com

Valuation: $1.7 billion

Cart.com is an e-commerce giant and logistics solutions provider that was founded in 2020 and obtained unicorn status within just three years.

3. Axiom Space

Valuation: $2.1 billion

Axiom Space is one of the anchor tenants at the Houston Spaceport, and has completed four missions of sending commercial astronauts to the ISS since 2022. In 2027, the company expects to see the first section of its private space station, Axiom Station, launched into low-earth orbit.

2. Solugen

Valuation: $2.175 billion

Solugen replaces petroleum-based products with plant-derived substitutes through its Bioforge manufacturing platform.

1. HighRadius

Valuation: $3.2 billion

HighRadius uses advanced technology to automate and manage accounts receivable processes for businesses worldwide.

The GHP also released its State of Houston’s Tech and Innovation Landscape, which mapped Houston’s digital and innovation sectors. Read the full report here.

Houston startup and investment leader John "JR" Reale has a new role at the Ion. Photo courtesy Rice Alliance.

The Ion taps John Reale for startup and investor role

new hire

The Ion has named John "JR" Reale as its director for startups and investor engagement.

In his new role, Reale, a longtime leader in Houston’s startup ecosystem, will work to strengthen the innovation district's founder and investor network.

"Here’s what I’ve come to believe: the Ion is not just a building, not just a real estate play, and not just another innovation district. COVID, remote work, and shifting market dynamics changed the rules. Key ingredients like co-working, events, and community, while impactful, are no longer enough on their own," Reale shared on a LinkedIn post announcing the move. "What’s needed are advantages ... We need to intentionally design a system that repeatedly delivers advantages so founders can pull forward their visions."

Reale previously served as executive in residence and venture partner at TMC Venture Fund and co-founded Station Houston. He also serves as managing director of Integr8d Capital. He's an investor and serves on the board of directors for a number of venture-backed companies, including Cart.com, Lionguard and others.

The Ion will host "Today Is Day One – A conversation with John (JR) Reale" to welcome Reale to the role on Tuesday, Oct. 21. Reale will be joined at the event by Heath Butler, partner at Mercury, to discuss their thoughts on shaping Houston's founders ecosystem, as well as the Ion’s Founder Advantage Platform.

"On top of this connected architecture, we will build product. That product will be the Founder Advantage Platform to remove friction, compress time, and compound outcomes," Reale continued on LinkedIn. "This is the system that will drive repeatable experiences, and naturally, make these journeys so much more fun."

Houston-based Action1 landed at No. 29 nationally and No. 1 in the software category in this year's Inc. 5000 ranking. Photo via Getty Images.

Fast-growing Houston tech firm leads dozens of local companies on Inc. 5000

growth report

Dozens of Houston-area businesses appear in this year’s Inc. 5000 ranking of the 5,000 fastest-growing private companies in the U.S., with a security software provider capturing the region’s No. 1 spot on the list.

Landing at No. 29 nationally and No. 1 in the software category, the top-ranked Houston-area private company is Houston-based Action1. The company recorded median revenue growth of 7,188 percent from 2021 to 2024, according to the Inc. 5000.

It’s the first appearance on the Inc. 5000 list for Action1, founded in 2018.

Action1 produces patch management software. A patch, or fix, quickly repairs software to resolve functionality problems, improve security or add features, according to TechTarget.

“Modern organizations understand that proactive patch management is essential to staying ahead of today’s rapidly evolving threat landscape,” Mike Walters, co-founder and president of Action1, said in a news release. “Our continued hypergrowth reflects the increased demand for enterprise cybersecurity innovation. You can’t be just powerful and secure — you must also be simple to deploy and scale and cost-effective.”

Below are the Houston-area businesses that earned a ranking among the top 1,000 companies, including their industries and their three-year growth rate. To see the other Houston-area companies in the Inc. 5000, visit inc.com/inc5000/2025.

  • No. 29 Houston-based Action1, software (7,188 percent)
  • No. 49 Spring-based Bogey Bros Golf, retail (5,540 percent)
  • No. 84 Houston-based Turtlebox Audio, consumer products (3,818 percent)
  • No. 87 The Woodlands-based Allied Wealth, financial services (3,796 percent)
  • No. 319 Houston-based Strategic Office Support, business products and services (1,228 percent)
  • No. 324 Houston-based Novo Communications, security (1,212 percent)
  • No. 363 Houston-based OptiSigns, software (1,101 percent)
  • No. 385 Houston-based Cart.com, business products and services (1,053 percent)
  • No. 421 Houston-based Sydecar, financial services (962 percent)
  • No. 471 The Woodlands-based Acuity Technology Partners, IT services (869 percent)
  • No. 577 Stafford-based Dahnani Private Equity Group, real estate (718 percent)
  • No. 706 Houston-based Why Not Natural, consumer products (585 percent)
  • No. 709 Stafford-based Signarama Sugar Land, manufacturing (584 percent)
  • No. 744 Houston-based FINBOA, software (557 percent)
  • No. 747 Houston-based Amundson Group, human resources (557 percent)
  • No. 793 Houston-based Field Industries, manufacturing (533 percent)
  • No. 957 Friendswood-based Good Ranchers, food and beverage (448 percent)
  • No. 999 Houston-based ARIA Signs & Design, business products and services (428 percent)
From insightful talks to a young professionals summit, here's what not to miss and how to register. Photo via Getty Images

11 can't-miss Houston business and innovation events for August

where to be

Editor's note: The tech event scene is heating up in August. From insightful talks to a young professionals summit, here's what not to miss and how to register. Please note: this article may be updated to include additional event listings.

Aug. 5 – Tech and Tequila Talk

Hear from guest speaker David Cohen, founder & CEO of Dallas-based Superposition, at the latest installment of Tech and Tequila Talk. The event will focus on breaking down ambiguity in data and AI projects through collaborative workshops.

This event takes place Tuesday, Aug. 5, from 5-7 p.m. at the Ion. Click here to register.

Aug. 11-16 – Black is Tech Week

Black is Tech Week will bring events for tech professionals, entrepreneurs and students to Houston through summits, career fairs, networking events and more. The event will feature speakers from Amazon, Microsoft, Google and many other companies.

This event begins Monday, Aug. 1. Find more information here.

Aug. 12 – NASA Stories at the Ion

Head to the Ion for the new morning series spotlighting the human side of space exploration. Each session will feature personal and powerful stories from astronauts and key NASA personnel. Anthony Vareha, NASA Flight Director and Flight Operations Directorate, whose primary duty is the safe operation of the International Space Station will speak this month.

This event begins Tuesday, Aug. 12, from 8:30-10 a.m. Find more information here.

Aug. 14 – Pickle Lab’s One-Year Anniversary Celebration

Enjoy an afternoon of open-play pickleball, beats by a live DJ, raffle giveaways and free swag at the first anniversary celebration of Pickle Lab in the Ion District. WonderPops will provide complimentary pops while supplies last, and Second Draught will serve each guest a free beverage.

This event takes place Thursday, Aug. 14, from 4-7 p.m. RSVP here.

Aug 19 – Navigating the Economy: Insights from Darren King

Darren King, chief investment officer of Moody Bank, will share his expert insights on the state of the economy and its impact on Houston’s future. Gain a deeper understanding of market trends, economic shifts and what they mean for businesses and individuals in the city.

This event takes place Tuesday, Aug. 19, from 11:30-1 p.m. RSVP here.

Aug. 21 – Transition on Tap

Greentown Labs’ signature networking event returns in August to foster conversations and connections within Houston's climate and energy transition ecosystem. Entrepreneurs, investors, students, philanthropists and more are invited to attend, meet colleagues, discuss solutions and engage with the growing community.

This event takes place Thursday, Aug. 21, at 5:30 p.m. at Greentown Labs. Click here to register.

Aug. 22 – Determined to Lead Women Lunch: Investing Through Market Cycles with Ellen Wilkirson

EnergyTech Nexus hosts a monthly Determined to Lead Women’s Lunch as part of its ongoing efforts to create safe spaces for women leaders in the energy transition to connect, learn and lead. The August session features Ellen Wilkirson, principal at Rev Innovations. With deep experience across traditional and transition energy sectors, Wilkirson will share how she’s approached investing through multiple market and commodity cycles and what it means to be a clean energy investor in today’s evolving landscape.

This event takes place Friday, Aug. 22, at 1 p.m. Click here to register.

Aug. 26 – Software Day at the Ion: Positioning your Startup to Capitalize on Market Trends

Software Day is a monthly series driving the support, inspiration and connections needed to help startups on their path to rapid, sustainable growth. Each month, Software Day will include office hours (by application), a keynote session and networking. This month’s panel discussion will feature Remington Tonar, co-founder of Cart.com, and Josh Teekell, founder of SmartAC.com.

This event takes place Tuesday, Aug. 26, from 3:30-7 p.m. Click here to register.

Aug. 27 – Future of Flight: Inside Venus Aerospace with Founder Sassie Duggleby

Join EO Houston for an exclusive, behind-the-scenes conversation with Sassie Duggleby, co-founder and CEO of Venus Aerospace, a Houston-based company pioneering breakthrough propulsion systems for hypersonic and space applications.

This event takes place Wednesday, Aug. 27, at 10 a.m. at Venus Aerospace. It is open to EO members and partners only. Click here to register.

Aug. 27 – The Future of American Science: A Conversation With US Rep. Brian Babin

U.S. Rep. Dr. Brian Babin and Paul Cherukuri, vice president of innovation at Rice University, will discuss how the United States remains at the forefront of space exploration, emerging technologies and scientific advancement, as well as what's next and what's at stake for the future of science policy.

This event takes place Wednesday, Aug. 27, from 3-4 p.m. at James A. Baker III Hall on Rice University's campus. Click here to register.

Aug. 28 – HYPE Summit

The third annual Houston Young Professionals and Entrepreneurs (HYPE) Summit is a day-long conference featuring panel discussions with business and thought leaders, workshop-style breakout sessions and networking opportunities. This year's event—under the theme Step Into the Spotlight—will feature speakers from First Bight Ventures, Bot Auto, Regions Bank, Lopez Negrete Communications and Umbrage.

This event takes place Thursday, Aug. 28, from 8:30 a.m.-5:30 p.m. at The Hobby Center for the Performing Arts. Click here to register.

Cart.com has closed its latest fundraising round. Photo courtesy of Cart.com

Houston e-commerce unicorn reaches $1.6B valuation with $50M fundraising round

fresh funding

Houston-based Cart.com, a provider of fulfillment and logistics services for B2C and B2B brands, has raised $50 million in venture capital, pushing its valuation to $1.6 billion. Since it was founded in 2020, Cart.com has raised $475 million.

Cart.com earned “unicorn” status in 2023 after securing a $60 million Series C round of funding. In the startup universe, “unicorn” refers to a private company that’s valued at $1 billion or more. Last year, Cart.com nailed down $130 million in debt funding, lifting its valuation to $1.2 billion.

Technically, Cart.com no longer qualifies as a startup. Rather, it’s now in “scaleup” territory. This term refers to a startup that has notched substantial growth and has maintained a stable workforce, among other positive achievements. Notable brands that have graduated from startup to scaleup include Airbnb, Peloton and Uber.

The $50 million round includes money from funds and accounts managed by BlackRock and Neuberger Berman, and new investors such as eGateway Capital, along with several unidentified venture capital firms, investors and family offices.

The company said it will use the fresh capital to fuel its global expansion through investments in infrastructure, technology, and M&A.

“Cart.com is continuing our strong growth trajectory across all operating metrics, and we intend to utilize this additional capital to accelerate the expansion of our platform and bring our customers new capabilities to enable their growth,” Omair Tariq, founder and CEO of Cart.com, said in a news release. Tariq added that his company is “well on our way to building the largest and most comprehensive platform in our space.”

Over the past 12 months, Cart.com completed its acquisition of OceanX, the fulfillment operation of direct marketing company Guthy-Renker, and Amify, an Amazon marketplace optimization and advertising platform. Bill Guthy, founder of Guthy-Renker, now sits on Cart.com’s board of directors

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New report shows surge in startup activity in Houston and across Texas

by the numbers

Houston and the rest of Texas are experiencing a boom in the creation of startups.

One barometer of growth in startup activity: The Houston metro area saw a 92 percent rise from 2024 to 2025 in the number of account applications submitted to Bluevine, a banking platform for small businesses.

New data from Bluevine also shows healthy year-over-year growth in account applications submitted by entrepreneurs in Texas’ three other major metros:

  • 242 percent growth in the San Antonio area
  • 153 percent growth in the Austin area
  • 28 percent growth in Dallas-Fort Worth

Further evidence of Texas’ uptick in business creation comes from a new state-by-state analysis of U.S. Census Bureau data by digital mailbox provider iPostal1.

From 2019 to 2024, the number of new business applications jumped 60 percent in Texas, according to the iPostal1 analysis. Wyoming tops the list, with a five-year growth rate of 216 percent.

“The U.S. has no shortage of ambition, but opportunity isn’t spread evenly,” says Jeff Milgram, founder and CEO of iPostal1. “In states like New York, Florida, and Texas, entrepreneurship is booming — people are starting businesses, taking risks, and finding opportunity.”

“Other states are still catching up,” Milgram adds. “Sometimes it’s access to funding, sometimes local policy, or just the confidence that new ventures will be supported.”

Women own many of the new businesses sprouting in Texas, according to a new analysis of 2024-25 data from the U.S. Small Business Administration. The analysis, done by SimpleTiger, a marketing agency for software-as-a-service (SaaS), shows Texas ranks eighth for the highest concentration of women entrepreneurs (109 per 1,000 female residents) among all states. That rate is three percent higher than the national average.

“Women entrepreneurs are no longer a side story in small business growth; they’re a leading indicator of where local economies are expanding next,” SimplyTiger says. “When women-owned business density is high, it usually signals stronger access to customers, networks, and startup pathways that make it easier to launch and keep going.”

In a December news release, Gov. Greg Abbott highlights Texas’ nation-leading job gains over the past 12 months, driven by employers small and large.

“From innovative startups to Fortune 500 corporations, job-creating businesses invest with confidence in Texas,” Abbott says. “With our strong and growing workforce, we will continue to expand career and technical training programs for better jobs and bigger paycheck opportunities for more Texans.”

Houston poised to add 30,900 new jobs in 2026, forecast says

jobs forecast

Buoyed by the growing health care sector, the Houston metro area will add 30,900 jobs in 2026, according to a new forecast from the Greater Houston Partnership.

The report predicts the Houston area’s health care sector will tack on 14,000 jobs next year, which would make it the No. 1 industry for local job growth. The 14,000 health care jobs would represent 45 percent of the projected 30,900 new jobs. In the job-creation column, the health care industry is followed by:

  • Construction: addition of 6,100 jobs in 2026
  • Public education: Addition of 5,800 jobs
  • Public administration: Addition of 5,000 jobs

At the opposite end of the regional workforce, the administrative support services sector is expected to lose 7,500 jobs in 2026, preceded by:

  • Manufacturing: Loss of 3,400 jobs
  • Oil-and-gas extraction: Loss of 3,200 jobs
  • Retail: Loss of 1,800 jobs

“While current employment growth has moderated, the outlook remains robust and Houston’s broader economic foundation remains strong,” GHP president and CEO Steve Kean said in the report.

“Global companies are choosing to invest in Houston — Eli Lilly, Foxconn, Inventec, and others — because they believe in our workforce and our long-term trajectory,” Kean added. “These commitments reinforce that Houston is a place where companies can scale and where our economy continues to demonstrate its resilience as a major engine for growth and opportunity. These commitments and current prospects we are working on give us confidence in the future growth of our economy.”

The Greater Houston Partnership says that while the 30,900-job forecast falls short of the region’s recent average of roughly 50,000 new jobs per year, it’s “broadly in line with the muted national outlook” for employment gains anticipated in 2026.

“Even so, Houston’s young, skilled workforce and strong pipeline of major new projects should help offset energy sector pressures and keep regional growth on pace with the nation,” the report adds.

The report says that even though the health care sector faces rising insurance costs, which might cause some people to delay or skip medical appointments, and federal changes in Medicare and Medicaid, strong demographic trends in the region will ensure health care remains “a key pillar of Houston’s economy.”

As for the local oil-and-gas extraction industry, the report says fluctuations and uncertainty in the global oil-and-gas market will weigh on the Houston sector in 2026. Furthermore, oil-and-gas layoffs partly “reflect a longer-term trend as companies in the sector move toward greater efficiency using fewer workers to produce similar volumes,” according to the report.

Construction underway on first-of-its-kind 3D-printed community in Houston

Building a Sustainable Future

Houston is putting itself front-and-center to help make sustainable, affordable housing a reality for 80 homeowners in an innovative scalable housing community. Developer Cole Klein Builders has partnered with HiveASMBLD to pioneer what’s touted as the world’s first large-scale, one-of-a-kind, affordable housing development using 3D printing technology — merging robotics, design, and sustainability.

Located across from Sterling Aviation High School, near Hobby Airport, Zuri Gardens will offer 80 two-bedroom, two-bathroom homes of approximately 1,360 square feet, situated in a park-like setting that includes walking trails and a community green space.

Homes in Zuri Gardens will hit the market in early summer of 2026. Final pricing has yet to be determined, but Cole Klein Builders expects it to be in the mid-to-high 200s.

Interestingly, none of the homes will offer garages or driveways, which the developer says will provide a cost savings of $25,000-$40,000 per home. Instead of parking for individual units, 140 parking spaces will be provided.

Each two-story home is comprised of a ground floor printed by HiveASMBLD, using a proprietary low-carbon cement alternative by Eco Material Technologies that promises to enhance strength and reduce CO2 emissions. The hybrid homes will have a second floor built using engineered wood building products by LP Building Solutions. Overall, the homes are designed to be flood, fire, and possibly even tornado-proof.

The "Zuri" in Zuri Gardens is the Swahili word for “beautiful,” a choice that is fitting considering that the parks department will be introducing a five acre park to the project — with 3D-printed pavilions and benches — plus, a three-acre farm is located right across the street. The Garver Heights area is classified as a food desert, which means that access to fresh food is limited. Residents will have access to the farm’s fresh produce, plus opportunities to participate in gardening and nutrition workshops.

zuri gardens 3d-printed housing community First large-scale affordable housing project of 3D-printed homes rises in Houston Zuri Gardens is getting closer to completion. Courtesy rendering

Cole Klein Builders created Zuri Gardens in partnership with the Houston Housing Community Development Department, who provided infrastructure reimbursements for the roads, sewer lines, and water lines. In return, CKB agreed to push the purchase prices for the homes as low as possible.

Zuri Gardens also received $1.8 million dollars from the Uptown Tourism Bond, 34 percent of which must be used with minority-owned small businesses. Qualified buyers must fit a certain area of median income according to HUD guidelines, and homes must be owner-occupied at all times. Zuri Gardens already has an 800-person waitlist.

“They’re trying to bridge that gap to make sure there is a community for the homebuyers who need it — educators, law enforcement, civil workers, etc.,” Cole Klein Builders’ co-principal Vanessa Cole says. “You have to go through a certification process with the housing department to make sure that your income is in alignment for this community. It has been great, and everyone has been really receptive.”

Cole has also brought insurance underwriters to visit the site and to help drive premiums below regular rates for Houston homeowners, as claim risks for one of the 3D homes are extremely low.

Tim Lankau, principal at HiveASMBLD, notes that the 3D hybrid design allows for a more traditional appearance, while having the benefits of a concrete structure: “That’s where the floodwaters would go, that’s where you can hide when there’s a tornado, and that’s where termites would eat. So you get the advantages of it while having a traditionally-framed second floor.”

It’s important to note that Zuri Gardens is not located in a flood prone area, nor did it flood during Hurricane Harvey — being flood-proof is merely a perk of a cement house. The concrete that Eco Material Technologies developed is impervious. The walls are printed into hollow forms, which house rebar, plumbing, and accessible conduits for things like electrical lines and smart house features. Those walls are then filled with a foamcrete product that expands to form a “monolithic concrete wall.”

David McNitt, of Eco Material Technologies, explains that his proprietary concrete is made of PCV, and contains zero Portland cement. Instead, McNitt’s cement is made from coal ash and is 99 percent green (there are a few chemicals added to the ash). Regardless, it’s made from 100 percent waste products.

“This is a product that has really been landfilled before,” says McNitt. “It’s coal ash, and it’ll set within 8-10 minutes. It’s all monolithic, and one continuous pour — it’s literally all one piece.”

Eco Material Technologies’ concrete product is impressively durable. A traditional cinderblock wall will crush at around 800 psi, while this material crushes at about 8,000 psi.

“It’s ten times stronger than a cinderblock wall that can withstand hurricanes,” claims McNitt. “I don’t think you’d even notice a hurricane. It’ll be really quiet inside, too — so you won’t get interrupted during your hurricane party. It’s way over-engineered, it really is.”

The second story is built using weatherproof and eco-friendly products by LP Building Solutions. Their treated, engineered wood products come with a 50 year warranty, and their radiant barrier roof decking product blocks 97% of UV rays, and keeps attic temperatures 30° cooler than traditional building materials. These materials, combined with the concrete first floor, will keep heating and cooling costs low — something the folks at HiveASMBLD refer to as “thermal mass performance.”

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This article originally appeared on CultureMap.com.