To Hyphenate or Not to Hyphenate?

When our two daughters, Maria and Katrina, were about nine and seven years old, they took gymnastics classes at a studio about 20 minutes from our home. As we drove to that studio each week, we passed a large, metal building with a sign out front that read “Hot Tub Factory.” As we passed the sign, I always asked the girls the same question: “Is that a ‘Hot, Tub Factory?’ or is it a ‘Hot-Tub Factory?’”