Green city is proud of servicing over 50,000 happy clients In Denver and surroundings since 1998! join the green city clients community by booking a service of HVAC maintanance, repair, duct cleaning/AC installation, any home project free estimate, energy efficient solutions for your home or even damage restoraion!! Green City is a 100% whole around home services provider!! It started with two guys and a truck 19 years ago in Denver and now over 9 technicians, cleaners, project managers and trucks across Colorado. In our teams there’s licenced and bonded HVAC specialists, chimney specialists and Indoor air quality professionals.