If you’ve ever winced at your hot tub’s running costs, you might be wondering whether there’s a smarter way to keep the water warm. One option that’s already popular for swimming pools, and is now ...

Lars Larsen, the Hot Tub Mad Max of Chicago, the roving, go-to repairman for many a hot tub emergency, is not a glamorous figure. He does not dawdle or like small talk or ingratiate. He works every ...