Yes, ductless mini-split systems are capable of both heating and cooling a space efficiently. They work as a heat pump, using an outdoor condenser unit and indoor air handler(s). In cooling mode, the system removes heat from inside and transfers it outdoors. In heating mode, the process is reversed - the system extracts heat from the outside air and transfers it indoors to provide warm air. Many mini-split models can sustain heating operations down to around 0-10°F outside temperature, making them suitable for year-round climate control in most regions. Their ability to provide both heating and cooling from a single zoned system is a major advantage.