Servicing Niagara Region and surrounding areas including St.Catharines, Welland, Fort Erie, Hamilton, Burlington, Oakville, Waterdown, Stoney Creek, Dundas, Grimsby. Heating Cooling Metal Fuels Sensors Plumbing Heating Building Automation Net Zero Incentives Offering combined experience of more than 70+ years, Carlton 5 proudly serves St. Catharines and the Niagara Region with professional heating, air conditioning and refrigeration sales and service. Call us to ensure your home, commercial or industrial facility HVAC system is working properly and efficiently for all seasons of the year. Your HVAC system does require maintenance to reduce service calls and interruptions. Carlton 5 mechanical prides itself on over 70 years of experience and technical abilities serving the Niagara Region and throughout southern Ontario.