How Long Should Your HVAC Last?
Every system has a lifespan. Knowing where yours stands helps you plan—and avoid emergency replacements.
Central Air Conditioner
Well-maintained units can hit 20 years. Coastal or high-humidity areas see shorter lifespans. If yours is 12+ and needing frequent repairs, start planning.
Gas Furnace
Furnaces tend to outlast ACs. Heat exchanger cracks are the big concern after 15 years—that's a safety issue and usually means replacement time.
Heat Pump
Heat pumps work year-round, so they wear faster than AC-only units. The compressor is usually the first major component to fail.
Boiler
Boilers have fewer moving parts than forced-air systems. Cast iron models can last 30+ years. Rust and leaks are the main killers.
Ductless Mini-Split
Quality mini-splits from brands like Mitsubishi and Daikin can last 20 years. Cheaper units may only make it 10-12.
Thermostat
Smart thermostats may need updating sooner due to software/connectivity changes. Mechanical ones can last 20+ years.
How Old Is Your System?
Not sure? The manufacture date is encoded in the serial number. Here's how to decode it:
Finding the Date in Your Serial Number
- Carrier/Bryant: First 4 digits = week and year (e.g., 0519 = week 5 of 2019)
- Trane/American Standard: First digit = year, second digit = week (letter-based)
- Lennox: First 4 digits after letters = month and year
- Rheem/Ruud: First 4 digits = week and year
- Goodman/Amana: First 4 digits = month and year (MMYY)
Can't figure it out? Send us your serial number and we'll tell you.
Signs It's Time to Replace
Repair Costs > 50% of New
If a repair costs more than half what a new system would, put that money toward replacement.
Rising Energy Bills
If bills keep climbing without rate increases, your system's efficiency is dropping.
Frequent Repairs
More than 2 repairs in the last year? The system is telling you something.
Uneven Temperatures
Hot and cold spots that didn't exist before mean the system can't keep up.
Strange Noises
Banging, squealing, or grinding that's new = components wearing out.
R-22 Refrigerant
R-22 is phased out and expensive. If your AC uses it, replacement is the smart move.
The $5,000 Rule
A quick way to decide repair vs. replace:
Age of System × Repair Cost
If the result is over $5,000, replace instead of repair.
Example: 12-year-old system × $450 repair = $5,400 → Consider replacement
Not Sure Where You Stand?
We'll give you an honest assessment. No pressure to buy—just straight answers about your system's condition.