Mini-split ductless systems or "mini-splits" are the solution we recommend for heating and cooling individual rooms within buildings that are outfitted with non-ducted HVAC systems. Mini-splits are becoming an economical solution for data room cooling. These systems are less intrusive into the structure and appearance of your home or business than other single-room air conditioner solutions like window units. They're also much more energy-efficient, which is better for your budget and for the environment.