The most commonly used heating systems in North America are forced air. There is one huge advantage in using forced air heating, and that is that the ducting in the system can also be used in summer to cool the house. So the ducting will transfer hot air throughout the house in the winter and cold air in the summer. When heating with forced air there are several steps and a number of components that make up the system. To start the cycle the thermostat turns on the system when the room temperature falls below its set temperature level. The air handler is turned on and draws room temperature air which is to be reheated. The air is heated and then is distributed throughout the building through the ducting. When the thermostat senses that the air has warmed up to the set temperature, the system shuts off until the next cycle. Lots of useful information about heating and heating systems can be found at heating Denver Colorado.