When dealing with a space without traditional HVAC ductwork, ductless air conditioning is an ideal solution for both cooling and heating. Ductless systems are also known as "mini splits" not only for their small size but because they are split into two parts: an outdoor compressor (the noisy part) and a number of indoor evaporators or "air handlers." A mini split requires only a small hole in the exterior wall, making for a fast and easy installation.
One of the biggest reasons why homeowners switch to ductless cooling and heating is the fact that ductless air conditioning are extremely energy-efficient saving money and keeping your family comfortable at the same time; while a central system tend to lose a great deal of energy (as much as 30%), via the ductwork.
HVAC ductwork can lose energy in two ways: through leakage of cooled (or, in winter, heated) air due to improper sealing and through conduction as the result of insufficient insulation.
Ductless systems can be zoned and that also means a huge contribution to energy saving. Each air handler has its own individually controlled, programmable thermostat, making it possible not only to adjust temperatures for each area according to user's preference, but to prevent waste energy on areas where there is no-one around.
Last but not least, ductless air conditioners systems follow ENERGY STAR strict guidelines, which means they are far more energy efficient than minimum federal standards. Improved efficiency will save you money, but it also helps reduce your total carbon output.