A furnace is a centralized heating system that distributes heat through your home via air, steam, or hot water. The furnace is a large, centralized appliance that can be combined with other climate control systems to make up a larger HVAC system. You need to understand the basic workings of the appliance so you know what to look for when there is something wrong.
Source: https://sierraair.ca/commercial/heating/heat-pumps
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