A system that runs constantly but never quite cools the house is trying to tell you something. Some causes are minor; others signal an aging system nearing the end of its life.
Key takeaways
- Most central AC systems last about 12–15 years.
- Short cycling and weak airflow often point to bigger problems than a dirty filter.
- An inspection documents the system's age and condition so there are no surprises.
Common reasons an AC underperforms
The simple ones are a clogged filter, blocked condenser, or low refrigerant. The more serious ones are an undersized system, failing compressor, or leaking ductwork that dumps cool air into the attic instead of your living space.
What we check on an inspection
We record the system's age, test that it produces an appropriate temperature drop, look at the condenser and line set, and note any signs of past repairs or impending failure. For buyers, knowing a system is 14 years old changes how you plan.
When to repair vs. replace
A good rule of thumb: if a repair costs more than a third of a new system and the unit is past 10–12 years, replacement is usually the smarter long-term choice.
Frequently Asked Questions
How long does a central air conditioner last?
Is low refrigerant a serious problem?
Will a home inspection tell me how old the furnace and AC are?
Ready to protect your investment?
Schedule your inspection with Milwaukee’s trusted team, or call us with questions.
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