There’s nothing like a warm, bubbly soak under the stars, but not everyone has the space—or budget—to install a permanent hot tub in their backyard. That’s where inflatable hot tubs come into play.

At some point, a hot tub stops feeling like a splurge and starts sounding like a really good idea. It’s one of the few backyard upgrades that actually changes how you use your space, whether you’re ...