Heating, ventilation, and air conditioner (HVAC) are an energy-efficient technology for indoor and outdoor vehicular, environmental control. Its purpose is to offer acceptable indoor air quality and thermal comfort. The term HVAC is now generally used to refer to a set of technologies that incorporate both heating and cooling systems. The systems are usually grouped into two types: centralized systems and portable systems. While centralized systems can be very large, most of the HVAC appliances are smaller and are installed in various rooms throughout a large building.

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Portable HVAC systems are usually installed on the construction site. They use ductwork or plumbing to bring air to the different rooms. Portable HVAC is considered less energy efficient than a centralized HVAC system, but it can reduce your heating and cooling costs. Portable HVAC makes better use of the available space, so you may be able to use HVAC to its fullest extent.

Some of the most popular HVAC technologies are evaporative cooling and solar-powered HVAC. An evaporative cooling system uses Freon or refrigerant to cool air inside a room without transferring it outside of the building. A solar-powered HVAC system runs on solar power and uses vents to force fresh air into the room. Portable HVAC makes use of ductwork and plumbing to bring HVAC to all rooms in the building.