Source: Canada HVAC | October 19th, 2022
A furnace is a heating appliance that heats cool air and then distributes it throughout a home or commercial building. Typically, it is one part of a heating, ventilation and air conditioning unit. Due to wear and tear, furnaces do not last forever and will deteriorate over time.
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Balance Point HVAC Blog

The energy intensity for cooling commercial buildings in the United States depends on the climate the building is located in. Energy intensity in buildings is the energy consumed per square foot of floorspace. U.S. commercial buildings in hot or very hot climates, which are primarily in the southernmost parts of the country, were more than six times more energy-intensive for cooling (14.2 thousand British thermal units per square foot [MBtu/sf]) than buildings in cold or very cold climates (2.3 MBtu/sf).