How long should a new HVAC system last?

A properly planned, installed and maintained HVAC system should have a working life of 10-20 years provided that consumable parts are regularly exchanged and any service and cleaning work is carried out according to manufacturer instructions. The general working life of a typical HVAC system that is not regularly maintained by manufacturer certified engineers is 7-10 years.

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How long should a new HVAC system last?