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Air conditioning and heating installation (or HVAC: heating, ventilation, air conditioning) companies offer a variety of services surrounding the heating and cooling systems of residential and commercial buildings. Common services include design and installation of temperature control systems, such as thermostats, furnaces, heaters and central air conditioning units. Some companies specialize in industrial portable solutions for heating or refrigeration, while others specialize depending on the fuel source, such as gas, oil or electric. Still other companies specialize in ensuring air quality through wall or window vent and duct cleaning and maintenance. For DIY enthusiasts, many HVAC companies offer cost-effective supplies (such as coils, fans, and pumps) and even training in simple tasks (such as installing vents in a room).
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