An Indoor Unit is a key component of a heating, ventilation, and air conditioning HVAC system. It is typically installed inside a building and is responsible for distributing conditioned air throughout the space. The indoor unit works in conjunction with an outdoor unit, which houses the compressor and condenser. Indoor units come in various types, including wall-mounted, ceiling-mounted, and ducted systems. They often include a fan and filters to help improve air quality. The efficiency and effectiveness of an indoor unit can significantly impact the overall comfort and energy consumption of a building.