Cool Air, Hot Takes

Take our survey: We love making Cool Air, Hot Takes™, but we want to make sure you love listening to it. Head to podpolls.com/hottakes , fill out our quick listener survey, and give us your hottest takes about the show.  Today on Cool Air, Hot Takes™, hosts Charlie Jelen and Dan Gentry sit down with Frank Kohout, a 35-year HVAC engineer veteran who spent a big chunk of his career at McDonald's Glo...

Take our survey: We love making Cool Air, Hot Takes™, but we want to make sure you love listening to it. Head to podpolls.com/hottakes , fill out our quick listener survey, and give us your hottest takes about the show.     Today on Cool Air, Hot Takes™, hosts Charlie Jelen and Dan Gentry sit down with Angie Simon , mechanical engineer, former president of a $125 million mechanical contractor, SMA...

Today on Cool Air, Hot Takes™, hosts Charlie Jelen and Dan Gentry celebrate a milestone: Trane's Graduate Training Program turns 100. Kris Gagermeier, Trane’s Director, Technical Training Center of Excellence joins to walk through the program's origins, how it's evolved over a century, and where AI fits into the next chapter of HVAC workforce development, including what it takes to get through 14...

Today on Cool Air, Hot Takes™, hosts Charlie Jelen and Dan Gentry sit down with Matt Caldwell, Director of AI & Cloud Data Centers at Hyper, a company building low-voltage electrical equipment for the data centers powering the AI boom. Matt makes the case that the US-China AI race makes the 1960s space race look like a warm-up lap — and explains why the industry needs to rethink how it designs...

Today on Cool Air, Hot Takes™, hosts Charlie Jelen and Dan Gentry sit down with Mike Dawson, VP of Sales at Parklane Mechanical, a company that's been solving industrial noise problems for over 30 years. Data centers are booming, and we've all heard the noise about them. Turns out, they're also just literally loud. Neighbors have opinions about that. Mike breaks down how noise control works, why i...

Season 4 is here! Hosts Charlie Jelen and Dan Gentry are back in the studio, fresh off the floor at AHR 2026 in Las Vegas, where the Cool Air, Hot Takes™ booth was open for business, t-shirts were flying, and the industry had lots to say.  This week, Charlie and Dan break down their hot takeaways from the expo — from the CDU arms race taking over every corner of the exhibit hall, to a surprising s...

Hot takes, cool systems, and zero fluff — Season 4 of Cool Air, Hot Takes ™ from Trane is here. Join Charlie and Dan as they bring in the sharpest minds in the industry to break down what's actually happening in heating, cooling, and building technology. AI, refrigerants, heat pumps, data centers, and whatever else is keeping engineers up at night.   Cool Air, Hot Takes ™ is brought to you by Tran...

Today, we’re wrapping season 3 with a deep dive into industrial high-temperature heat pumps. Hosts Charlie Jelen and Dan Gentry talk with Mobola Dosumu , National Sales Manager for Heat Pumps at Everllence , whose custom-engineered systems deliver multi-megawatt heating and up to 350°C steam for heavy industry and district energy. Mobola explains why these heat pumps aren’t “what’s next”, they’re...

In this special end of year episode, hosts Charlie Jelen and Dan Gentry are flying solo and taking you on a tour of 2025’s hottest (and coldest) takes. From bold industry predictions and legendary pop-ins, to the now iconic reminder to “never fall in love with a bearing technology,” the guys look back at the takes that shook the HVAC world, and the ones that never quite left the factory floor. (Ye...

Today, hosts Charlie Jelen and Dan Gentry are joined by an HVAC legend, Mick Schwedler . With more than 43 years at Trane and former Global ASHRAE President, Mick reflects on how the industry has evolved from floppy disks and early energy modeling to digital design, electrified heating, and systems-level innovation. He explains why giving engineers just a bit more time and budget leads to better,...

Today, Autodesk’s Director of Product Management , Ian Molloy , joins hosts Charlie Jelen and Dan Gentry to explore how digital design is transforming the built environment. We dig into where building information modelling (BIM) is heading, what truly defines a digital twin, and how Autodesk and Trane are closing the gap between modeling and load calculations. Ian also explains how prefab workflow...

We’re back with another data-center-deep-dive - this time with Jason Espeseth , Principal Electrical Engineer at Geronimo Power . Together with hosts Charlie Jelen and Dan Gentry , Jason breaks down the rise of “bring your own power” data centers and explains how pairing wind, batteries, and firming gas near-site can dramatically reduce interconnection timelines and avoid passing grid costs to rat...

We’re back! And we’ve gone big for the first episode of season 3! Today, Ali Heydari, Director of Data Center Cooling and Infrastructure at NVIDIA , joins hosts Charlie Jelen and Dan Gentry to unpack how AI “factories” are reshaping data center design and why Ali thinks the AI revolution is the biggest change to the our lives since the industrial revolution. Ali explains why geometry (not thermody...

Today on Cool Air, Hot Takes , hosts Charlie Jelen and Dan Gentry sit down with Mike Fierro , Supply Chain Products Manager at SourceBlue (Turner Construction), to unpack how the biggest projects actually get done. From pre-purchasing chillers and generators, to designing around lead times, Mike explains what changed post-COVID, why data centers are rewriting the playbook, and how a hyperscale job...

This week, Zach Zentz , Technician Productivity Manager at Trane, joins hosts Charlie Jelen and Dan Gentry for a deep dive into the world of HVAC technicians. From what a day on the job really looks like to why laptops are now just as essential as the wrenches, Zach breaks down the challenges and opportunities shaping the HVAC technician experience. He also shares stories from the field, including...

Data Centers: Hot Servers, Cool Solutions Today, Sam Brown, Chief Development Officer at Serverfarm , joins hosts Charlie Jelen and Dan Gentry, for a deep dive into the world of data centers. From the art of picking the perfect site to why he’s not convinced liquid cooling will dominate the future, Sam shares insights from 15 years in the industry. Plus, Sam explains why he thinks data centers mig...

Managing HVAC Assets the Smart Way Today on Cool Air, Hot Takes , Charlie Jelen and Dan Gentry are joined by Stephen Zetarski , COO of Nuvolo , to explore how data-driven asset management is changing the way buildings operate and the way technicians work. From cloud-based platforms that connect every asset and workflow, to improving service speed and accuracy, this truly is the definition of worki...

Industrial heat accounts for approximately a quarter of global energy consumption, says Ruth Checknoff, today’s guest, and is the key to hitting climate targets.  Today on Cool Air, Hot Takes , Dan and Charlie welcome Ruth Checknoff , Senior Project & Research Director at the Renewable Thermal Collaborative , to talk about the hot (literally) challenge of decarbonizing industrial thermal proce...

This week on Cool Air, Hot Takes , we’re doing something a little different. We’re dropping a special crossover episode from our friends over at the Healthy Spaces podcast, featuring our very own Dan Gentry and Charlie Jelen . Together, they sit down with Dominique Silva and Scott Tew to share how two middle-school friends from Wisconsin ended up in HVAC, what their favorite hot takes from the pod...

We’re back! Welcome to Season 2 of Cool Air, Hot Takes : the podcast where buildings, energy, and HVAC collide in all the best ways. Hosts Charlie Jelen and Dan Gentry return with fresh (hot) takes, big laughs, and sharp insights into what’s next in the world of HVAC and energy systems. In this episode, we’re going deep on PIC valves, that’s pressure independent control valves, with Rob Trickett ,...

The podcast that’s as smart as your building’s thermostat is back! Hosts Charlie Jelen and Dan Gentry return for Season 2 of Cool Air, Hot Takes , the podcast that dives deep into the future of HVAC, energy systems, and the bold ideas reshaping buildings. Whether you’re an engineer, designer, facility manager, or just someone who appreciates a healthy delta T, you’re in the right place. This seaso...

What if your building could act like a battery - and get paid for it? In this episode of Cool Air, Hot Takes , hosts Charlie Jelen and Dan Gentry talk with Adam Scarsella , Director of Sales at Voltus , about how demand response and virtual power plants are transforming energy use. From chillers to controls, they break down how smart buildings are shedding loads, shifting demand, and supporting th...

Is decarbonization the biggest challenge or the biggest opportunity for the HVAC industry? In this episode of Cool Air, Hot Takes , hosts Charlie Jelen and Dan Gentry are joined by Molly Dee-Ramasamy , Director of Deep Carbon Reduction at JB&B, to unpack what decarbonization really means for buildings, systems, and the people designing them. From electrification and grid impacts to policy shif...

Is AI really the future of HVAC, or just industry hype? In this episode of Cool Air, Hot Takes , hosts Charlie Jelen and Dan Gentry talk with Jean-Simon Venne , CTO and co-founder of BrainBox AI , about how artificial intelligence is reshaping HVAC systems. They explore real-world ways AI boosts energy efficiency, enhances preventative maintenance, improves indoor air quality, and helps buildings...

What’s the real story behind AC refrigerants? Why are some being phased out, others destroyed, and what does it mean for the HVAC industry? In this episode of Cool Air, Hot Takes , Charlie Jelen and Dan Gentry sit down with Ray Rieling from Tradewater to talk about refrigerants - the good, the bad, and the banned. From legacy refrigerants like R-22 to the controversial future of HFC refrigerant de...