A warm air heating system is either gravity or forced air. Most forced air systems use fuel oil or natural gas as a heat source, however some do use electric or heat pumps, typically in older homes. In this type of heating system, the air is heated in a furnace and blown by a fan through ducts in the rooms of the home or business. It is the most popular type of heating system used in North America.
Some advantages of using a forced warm air system are that it can accommodate humidifiers, whole-house air cleaners as well as central air conditioning units. It also works great with programmable thermostats, which helps to save energy and money. In terms of cost, the initial price of installing one is much lower than other types and maintenance costs are generally low (replace filters).
It is important that these systems are installed correctly because an improper one is prone to air infiltration which will lower the humidity in the space. This increases the amount of energy used and will drive energy costs up.
All furnaces and AC systems must be serviced annually to keep them operating efficiently.