Does my Air Conditioner unit double up as a heater in the winter? Jessica 13 October 2021 15:52 Updated Most portable air conditioning units do not double up as a heater, but we do sell a 12,000 BTU 4-in-1 Portable Air Conditioner & Heater which can be used all year round. Related articles Will my Air Conditioner unit cool my whole house? Can I use a portable Air Conditioner in a room without a window? How often do I need to drain the water tank? What size is the window kit? What size Air Conditioner shall I get?