HVAC · Sourced answer

How long does an HVAC system last, and is it better to repair or replace an aging unit?

Consumers evaluate the 10–15 year lifespan, repair costs vs. replacement value, and the '5,000 rule'.

The answer

AC/Heat Pumps last 12-15 years; Gas Furnaces last 15-20 years. Apply the $5,000 Rule: Repair Cost x Age in Years; if > $5,000 (e.g. $600 x 10 yrs = $6,000), replace. Replace if major components fail (cracked heat exchanger, locked compressor) or if using obsolete R-22 refrigerant.

Sources

This answer is drawn from the standards and guidance below. It is general information about how these systems work — not a diagnosis of your property.

ENERGY STAR When to Replace
ASHRAE Equipment Life Expectancy