Some of the most important purchases that your customers will make fall into the comfort appliance zone. This includes appliances like furnaces, air conditioners and combined models known as HVAC (Heating, Ventilation and Air Conditioning) systems. There are a huge array of models to choose from and name brands are only the first concern. Your customers expect you to provide a reliable product no matter who manufactures it and you demand an AC Supply company that can provide these products. This is not as easy as it sounds because heating and cooling equipment comes in a variety of sizes and types.