For most brands, going to market only being able to sell a few hundred units because of supply chain headaches sounds like a nightmare. But for Windmill, which sells both air conditioners and HVAC filters, this turned into marketing gold.

The company first launched in the summer of 2020. "[We] had a really awesome launch plan for 2020 that we had to scrap," said co-founder Mike Mayer. "And so we couldn't get units from the factory to the U.S., just given all the complications in the supply chain." This made it so that the company had to build a waitlist.

It's not the cleanest way to launch a brand and a business," Mayer said on the Modern Retail Podcast. "But it did sort of stir up some buzz." Many media outlets wrote about the multi-thousand-person waitlist. And when the products were finally ready to ship to customers' homes many months later, that led to even more coverage.

It's been a few years since then, and Windmill has continued to grow. The company saw sales triple between 2022 and 2021, and just this year has expanded into HVAC air filters. With this growth, the business and marketing has gotten more nuanced. For one, Windmill -- which began as a DTC brand -- has expanded into new sales channels. Its available at the Home Depot and P.C. Richards, and will launch online at Lowe's later this summer.

What's more, Windmill has begun investing more heavily in advertising. It no longer just relies on word of mouth or digital campaigns. For example, it's investing more in TV. It's a difficult formula to master, said Mayer, as Windmill makes a product that most people don't usually think of as branded.

"The magic that we bring to this category is we have a brand [and] we have a personality in everything that we do," Mayer said. "TV is no different."

With the summer on the horizon, Windmill has plans to introduce more people to its products. It also has some new products it's going to unveil. "There's a lot more to come from Windmill and from us," Mayer said. "We're really excited."