Profile: McDowall Company specializes in installing heating, ventilating and air conditioning (HVAC) systems for industrial, commercial and governmental facilities. We offer built-up asphalt & gravel roofs, white reflective membranes, elastomeric seamless membranes and EPDM rubber systems. These include stone-ballasted & light-weight and smooth-surfaced roofs. Our comfort management offers single source solutions on a variety of industrial & commercial heating and cooling systems.