Horizon Enterprises HVAC contractors, specialize in commercial & residential installations, maintenance & service in schools as well as homes and businesses. Call Horizon Enterprises for all your air conditioning, heating, plumbing, refrigeration, and site utility work. Horizon Enterprises requires all newly-hired employees pass a background check.. ALL heating,cooling,plumbing,gas,utility,& refrigeration equipment sales and service. Full service sheet metal shop,high pressure water jetting,and sewer line inspections. Backflow testing and repair.