What is The Definition Of A Mini Splits Heat And Air? A Mini Split Heat and Air system is an energy efficient, multi-zone air conditioning and heating unit. It is a ductless system that provides both heating and cooling from one unit. It can be used to replace an old furnace and air conditioner, or for new construction. The system works by taking a single outdoor condenser unit and connecting it to multiple indoor air handling units. Each air handler has its own thermostat and can be set to a different temperature. This allows you to customize the temperature in each room without affecting any other. The units are very efficient, using 30%-50% less energy than traditional systems. They are also quieter and maintain better air quality. Mini splits heat and air systems can be installed in a variety of settings, from residential homes to commercial buildings. They are a great way to cool and heat your space without spending too much on energy bills.