A duct-free, or mini-split system is a unique system with large upfront costs, but big benefits for certain needs and applications. These types of HVAC units are individual units in each room, providing greater independent control. These units are mounted on walls indoors, and are usually attached to an outdoor compressor. This installation process is expensive, and visually obvious for the owners. These units are perfect for new additions to homes, such a garages, additions, or additional buildings, because it is easier to install, and allows independent control of the unit. These types of HVAC units are also beneficial for service businesses such as hotels or venues, allowing tenants to control individual temperatures and conditions. Another benefit is energy conservation, since individual rooms that are being used are being heated, it keeps exterior or unused rooms from wasting energy. This is why individuals retiring or downsizing could seek to install these systems, keeping the rooms they use warm and the rooms they do not use from sapping energy. These systems to require regular and intensive cleaning and maintenance, which is important to keep up with as the cost of total repairs and replacements are expensive.