Extra Air System Heating and Cooling Co. is based in Dorset Park, Milton.Extra Air System sells, installs and services Heating Ventilation and Air Conditioning products. Along with all the major manufacturers, Extra Air System is authorized by the Carrier Corporation to sell and service Carrier products. Extra Air System is an expert in installation and service of major fireplace products such as Napoleon.Please give us a Call for a free Quote on purchase and servicing your HVAC equipment.HVACFurnace repairAir ConditioningHeatingHot water tanks.