Conventional furnaces
Furnaces function by pulling air into a ductwork. The air is heated there and then released back into the room. Coal, electricity, wood or even gas can be used as fuel for heating in traditional furnaces. An air filter in the furnace helps draw out the dust particles and cleans the air.
Electric heat pump
A heat pump draws in warm air from its vicinity and then lets it out into the room. Electric heat pumps have vents and filters similar to furnaces. Heat pumps can also be used as air conditioners when the air outside is cooler than inside the home.
Radiant baseboard heat
Baseboard heating units are metallic strips with heat generating parts on them. They have their own control units, which are graded for convenience. These units can be used as the sole heat source in a room or they may be used as an additional heat source.
Space heaters
Space heaters may be installed into a living space or simply placed as freestanding units, to provide heat. Electricity, gas and kerosene are some of the fuels used in a space heater.