HVAC Life Expectancy: When to Repair, When to Replace
Central air systems often last 15–20 years. Here are signs to watch for and why repair-or-replace decisions need a qualified HVAC technician and written quotes.
Published 2025-01-18 · Updated 2026-04-21 · 4 min read
How long does a central HVAC actually last?
The ASHRAE service life guideline for residential central AC is 15 years; furnaces 18 years; heat pumps 14 years. In hot, humid Texas climates the AC end is typically pulled forward 2–3 years due to extended cooling-season runtime.
How do I decide between repair and replacement?
There is no single formula that fits every home. The age of the system, its condition, the repair being proposed and your plans for the house all matter. A qualified HVAC technician can assess the system, and written quotes let you compare options.
What are the warning signs that a system is failing?
- Refrigerant top-offs more than once a year (likely leak in evaporator coil)
- Compressor cycling on/off in under 5-minute intervals (“short cycling”)
- Indoor humidity above 60% with AC running (under-sized or low charge)
- Electric bills rising 15%+ year-over-year with no usage change
- Visible ice on the suction line at the air handler
Is a higher SEER worth the cost?
Higher-efficiency equipment can lower cooling energy use, but whether it pays off depends on your home, usage and electricity rates. A qualified HVAC contractor can provide a written comparison.
How does ProActive score HVAC?
The HVAC sub-score on your Home Intelligence Score weights three things: current condition (filter, coil, drain pan, refrigerant), age vs. expected life (ASHRAE benchmarks adjusted for local climate), and open deferred items (any prior flagged finding). A 14-year-old AC with a clean coil and a flagged refrigerant top-off will score notably worse than a 14-year-old AC with no flagged items.
Frequently asked questions
How often should I change my HVAC filter in Texas?
Every 60 days during cooling season (April–October), every 90 days otherwise. Homes with pets or in pollen-heavy areas should swap every 30 days during peak season.
Is a heat pump a good idea in Central Texas?
Yes for new builds — modern variable-speed heat pumps handle the mild Texas winters efficiently and provide cooling. For existing homes with working gas furnaces, replacement timing matters more than the upgrade.
Does annual HVAC service really matter?
Regular service helps keep equipment running as intended, and manufacturers generally recommend it.