These systems function by burning product to heat the air around it, this air is then fed by way of a number of ducts throughout the building. These furnaces are typically powered by propane or purely natural fuel. Boiler / Central Heating Systems Most often, HVAC systems are compelled-air systems https://hvac-companies-in-dubai58891.ezblogz.com/62260315/the-smart-trick-of-hvac-companies-in-dubai-that-no-one-is-discussing