Fuel Sources
GAS
FUEL_OIL
PROPANE
ELECTRICITY
WOOD
Heating Systems
FORCED_AIR_DUCTS
BOILER_RADIATOR
RADIANT_FLOOR
BASEBOARD
GAS_FIREPLACE
WOODBURNING_FIREPLACE_STOVE
MINI_SPLITS
PORTABLE_SPACE_HEATERS
CENTRAL_DUCTED_HEAT_PUMP