TECHNIQUES_TO_TROUBLESHOOT_COMMON_FURNAC

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