The answer to 'what is replacement' is the process of installing a new HVAC system or component to replace an older, outdated, or malfunctioning one. Replacement is often necessary when an existing HVAC unit has reached the end of its useful life, is no longer energy-efficient, or is unable to meet the heating and cooling needs of a home.
Replacement can involve swapping out the entire HVAC system, including the furnace, air conditioner, and ductwork, or just replacing a specific component like the air handler or compressor. The decision to replace versus repair an HVAC system depends on factors like the age of the equipment, the cost of repairs, and the potential energy savings from a new, more efficient system.