Heat pumps are having a moment. They’ve outsold gas furnaces in the U.S.

for the past two years. And they’ve inspired some fans who love them so much that they’re now buying heat pump merch—including socks. Quilt, a heat pump startup launched by an ex-Googler who wanted to make the appliance better-looking and easier to install , just rolled out the first-ever heat pump capsule collection , including a $55 sweatshirt, a $35 hat, and an ’80s-style holographic sticker for $2.

(The designs take inspiration from old HVAC ads, but are a lot more fun.) When the company’s marketing and communications directors started at the company about a year ago, they both thought that building awareness and passion about heat pumps would be a challenge. “I was like, ‘How are we going to build this movement around an appliance?’” says head of marketing Lizz Niemeyer.

“As we started digging in, we realized that there was this really, really passionate subcommunity of people who have just been here promoting heat pumps, talking about heat pumps, recommending heat pumps, and have been doing so for years. And that community really was looking for, I think, ways to express themselves.” Early on, when the company opened up a wait list for its first product, the team sent out a survey and promised a heat pump hat to the first 500 people to respond.

They ran out of hats nearly immediately. | The group of heat pump fans is diverse, Niemeyer says, ranging from HVAC installers who w.