Repair or replace? How to actually decide
This is the most expensive question in HVAC, and the person answering it is often the same person who profits more from one particular answer. Here is how to think it through yourself before anyone gives you a number.
Start with age, not with the symptom
Age is the most useful single input you have. A five-year-old system with a failed capacitor is a repair, full stop. A fifteen-year-old system with the same symptom is usually the first sign the rest of it is not far behind.
Most residential systems run somewhere in the range of 15 to 20 years, depending on maintenance and how hard the climate works them. If you are already past that point, get the replacement priced even if you end up repairing this time — you want the number in hand before a summer heat wave forces the decision.
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The industry rule of thumb, used correctly
A common guideline multiplies the age of the unit by the repair estimate; past a certain threshold, replacement usually makes more sense than another repair. It is a reasonable starting heuristic, not a law of physics.
The number that matters more than the formula is whether this is the system's first failure or its third in two years. A pattern of breakdowns is telling you something a single repair estimate cannot.
What actually failed changes the calculus
A blower motor, a capacitor, a contactor or a thermostat are all routine, inexpensive repairs on a system with life left in it. A cracked heat exchanger on a furnace or a major refrigerant leak in the coil is a different conversation entirely — both are expensive to fix and both are reasonable moments to price a full replacement instead.
Ask directly what failed and why. A straight answer with a part name is a good sign. A vague answer that jumps straight to replacement is worth a second opinion.
How to test whether you are being steered
Ask directly: what would it cost to repair this specific failure, and how much life would that buy me?
A contractor who answers plainly, even when the honest answer is a small repair bill, is playing a longer game — they would rather have your maintenance business and the referral. Someone who will not price the repair, or cannot explain why it will not hold, is telling you something about the recommendation.
Common questions
Can I repair just the AC and leave the furnace alone?
Usually yes if they are not a matched system sharing a single air handler in a way that requires replacement together. Ask specifically whether your setup allows it before assuming either way.
How long does a typical repair last?
A properly diagnosed repair on a system with real life left can last years. A patch on a system already showing multiple failures tends to buy a season, sometimes less.
Will my home warranty cover HVAC repairs?
Home warranty coverage varies widely by provider and often excludes pre-existing conditions or lack of maintenance. Read the actual contract language rather than assuming coverage.
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