How a sealed pump the size of a melon built Tecumseh

There is a good chance the refrigerator humming in your kitchen owes something to a small town on the River Raisin. The thing that keeps a fridge cold is a hermetic compressor — a sealed pump, roughly the size of a cantaloupe, that squeezes refrigerant gas around and around. For much of the twentieth century, a remarkable share of the world’s compressors came out of Tecumseh, Michigan.

The company that made them got there almost by accident. Ray Herrick and his partners started out as the Hillsdale Machine & Tool Company in 1930, scraped together a little over $12,000, and in 1934 used it to buy an abandoned 30,000-square-foot building in Tecumseh. They renamed the operation Tecumseh Products and bet the whole thing on that one sealed pump. By the end of the 1930s the plant was turning out more than 100,000 compressors a year, and they ended up buried inside refrigerators and air conditioners on shelves around the globe.

A factory that size does not just sit at the edge of a town — it becomes the town. The payroll filled the storefronts, the Herrick name landed on parks and a hospital and a library, and Tecumseh grew up shaped around its one big employer. For decades, if you were from Tecumseh, the odds were good that you, your father, or your neighbor clocked in at “the Products.”

That kind of single-employer town is a familiar Michigan story, usually told about car plants in bigger cities. Tecumseh ran the whole arc in miniature, on the strength of a part most people have never seen and could not name — the quiet pump that keeps the milk cold.