A Minimalist’s Cold Plunge

Photos: HomePlunge

At first glance, Christopher Francis’s story sounds almost too perfectly engineered for a startup origin tale: a soccer injury, a makeshift ice bath, a burst of inspiration, and then a fully realized wellness product. But like most good stories, the real journey happened in the unpredictable middle; the stress, the setbacks, and the sheer stubbornness that transforms a scribbled idea into a CES award-winning product.

Christopher, a Florida native and engineering graduate from UCF, didn’t set out to reinvent the cold plunge. He just wanted to walk down the stairs without wincing. A lifelong athlete, he tore his ACL in college and, by his early 30s, was in near-constant pain after weekly soccer games. Traditional recovery methods like ice packs, rest and stretching offered only marginal relief. Then, one particularly painful morning, driven by desperation and some podcast inspiration, he decided to try a full-body cold plunge. He filled his bathtub with ice trays, frozen peas, and whatever else he could find in his freezer. It was uncomfortable, but when he climbed out, the pain had vanished. “It was literal magic,” he says.

It was also the start of a journey he never anticipated. While his discovery was transformative, the logistics weren’t practical. His home in San Francisco had no yard or garage. Space was at a premium. Outdoor plunge tubs, the kind you see circulating wellness influencers, weren’t an option. But his bathtub? That was something he already had and rarely used. When he searched for a product that could convert a standard bathtub into a cold plunge, he was stunned to find nothing on the market. That gap and his own unsolved need became the foundation of his business.

Christopher wasn’t new to tinkering with ideas. He’d been jotting down product concepts for years, often in notebooks or the Notes app on his phone. But this time was different. This idea was personal. And it worked. He bought an aquarium chiller online, rigged up some tubing, and created a DIY prototype. It was bulky and rough around the edges, but it worked well enough to convince him there was something there.

“I hope my story can inspire someone like me who always writes down their ideas and knows they have it in them,” said Christopher. “Don’t be afraid to reach out and grab the lightning bolt when it strikes. “

“I left control systems engineering in Louisiana where I moved to NYC to join as one of the first employees at Ketra Lighting and was introduced to luxury design through our work with prominent NYC projects and designers,” said Christopher. “I made personal relationships with top lighting designers such as Nelson Jenkins and Susan Tillotson, working on projects like 425 Park, RGA, Facebook and Google offices, and countless high-end residential projects. My pride and joy was when I cold-called BIG architects that led to a Lunch and Learn at their Manhattan office and resulted in our winning the job to light their new HQ in Dumbo Brooklyn. In less than two years we were acquired by Lutron, an acquisition that was good for the business but a clash of culture that led to my departure. I set off to San Francisco to join the tech scene and finally, after engineering control systems in Louisiana, working in hardware with architectural lighting in NYC, and cutting-edge software with augmented reality for architecture in the City, I realized what I was meant to do, create my own products.”

What followed was two years of intense research, trial and error, and solo entrepreneurship. Without prior experience in hardware product development, he started from scratch, literally Googling, “how to manufacture a hardware product.” Fortunately, today’s landscape is friendly to first-time inventors. He connected with prototyping services, worked with industrial designers to refine his vision, and learned to navigate the daunting world of overseas manufacturing. “My design intent included modeling the hose-arm after the car exhaust pipe concealed by a rectangular metal extrusion,” said Christopher. “HomePlunge is the first chiller to hide the inlet and water tubes to maintain aesthetic elegance. The alternative is an industrial black box with dangling tubes reaching over the tub looking like a mechanical octopus.” 

During his first round of manufacturing, almost immediately, he encountered a critical flaw: the O-rings were the wrong size. That meant no airtight seal, and no suction. So, Christopher had to send out replacement parts to every early adopter. A logistical nightmare, but also a crash course in quality control.

The entire business was bootstrapped, no outside funding, no investors. He sold his Florida home and emptied his 401(k) to fund the first production run. He was, by his own account, days away from going broke. But as the January 2024 production batch arrived, so did a glimmer of validation: he received a CES Innovation Award (Consumer Electronics Show, the largest technology trade show in America). Despite being unable to afford a booth at the show, the win boosted visibility and credibility. Sales began slowly, five units in November, a few more in December, but they kept coming.

He leaned into what he knew: storytelling and community building. A small but growing waitlist of email subscribers and organic buzz kept things afloat until his ad campaigns went live. Once they did, sales jumped dramatically, and the product began gaining a foothold.

The HomePlunge is sleek, compact and requires no permanent installation. It uses a flexible, bendable arm that sits on the rim of the tub and cycles water through a chiller, cooling it to therapeutic temperatures. It’s designed to be stowed when not in use, making it accessible for city dwellers and anyone tight on space. Christopher notes that many families now use it together, a testament not only to its effectiveness but also its ease.

Despite the early hurdles, the product has seen steady improvements and they’ve seen less than five service issues in the last batch of the 200 second-generation units produced. Christopher recently completed the third iteration in just over a year, each version improving performance based on incorporating customer feedback and durability upgrades. He even traveled to China to sit with engineers and address design pain points in person. He discovered that while his design was sound, production shortcuts made repairs difficult. The newest version now features modular parts that can be easily swapped out by users should there be a service issue.

Christopher’s vision for the company is simple but quietly disruptive: make cold plunge recovery something people can actually live with, something elegant, efficient and seamlessly integrated into the home. As architects begin specifying his system in high-end residential projects, he sees cold therapy following the same trajectory as other once-niche amenities. What was once considered indulgent or optional like heated floors, steam showers and bidets is now an expected part of thoughtful, wellness-driven design. Cold plunge, he believes, is next.

The appeal, particularly for designers and architects, lies in restraint. No dedicated room. No backyard footprint. No visual noise. The system respects space, works within existing architecture, and disappears when not in use, an approach that aligns more closely with good design than with gadget culture. With the upcoming HomePlunge Bella, a smaller and lighter model, that design-forward sensibility expands to a broader range of homes, budgets and floor plans.

What ultimately makes this story resonate isn’t just the product, it’s the intent behind it. Christopher didn’t chase trends or investor narratives. He solved a problem the way designers often do; by starting with lived experience, questioning assumptions, and refusing to accept that inconvenience was the price of performance.

And fittingly, a product now finding its way into architectural specifications began in the most unassuming of places, not a lab or showroom, but a bathroom. A bathtub filled with melting ice, a moment of relief, and the realization that good design doesn’t start with grand gestures. It starts with paying attention.

“I hope my story can inspire someone like me who always writes down their ideas and knows they have it in them,” said Christopher. “Don’t be afraid to reach out and grab the lightning bolt when it strikes. “