Available Franchise Territories Find your plumbing & HVAC franchise opportunity by clicking your state below. Available Markets No Available Markets DON'T SEE YOUR MARKET? CONTACT US FOR MORE DETAILS. 0 K MAX TERRITORY SIZE 0 + TERRITORIES AWARDED SINCE 2017 $ 0 M AVERAGE UNIT VOLUME * *Operating 8 months minimum, includes affiliate location. See item 19 in FDD for more information. Ready to start a conversation about your 1-800-Plumber +Air franchise?