Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels and senior living facilities, medium to large industrial and office buildings such as skyscrapers and hospitals and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors. The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments.

Given the importance of indoor air quality to your health, HVAC units are normally intended to last a long time. As a result, you should always ensure that any installations are carried out by a qualified specialist. There are two major varieties of HVAC system Individual system & District network system.

Individual HVAC systems can be located inside a conditioned zone or adjacent to it. Local systems include local heating, local air-conditioning, local ventilation, and split systems.

A district network is a centralized system that provides chilled water to supply an air conditioning system. In practice, it includes chilled water production and distribution facilities to provide cooling services to all connected buildings. Operating as a closed circuit, the cooling network always includes two pipelines: one supplying chilled water to users, and the other returning the water to the production plants.