Roof and HVAC Lifespan by Climate: A 2026 Cost Model
Updated
Direct answer: No universal coastal-versus-inland depreciation curve is defensible. Start with HomeScore's planning baselines—about 25 years for architectural asphalt roofing and 16 years for central AC plus gas furnace—then adjust annual life consumption for salt, heat and humidity runtime, wind and hail events, installation quality, condition and verified maintenance. Climate changes hazard, not a guaranteed failure date.
Service life: the modeled number of years a system is expected to remain fit for purpose under ordinary conditions. It is a planning central tendency, not a warranty and not a failure date.
Annual life consumption: the fraction of total service life used in one year. Under a straight-line planning model it is simply one divided by service life.