Repair, unless the system is old and the repair is expensive and it is not the first one. That is the short version, and the rest of this page is the arithmetic behind it, using our own Sacramento invoices rather than national averages.
The honest starting point: most repairs are not close calls. Across 85 residential repair visits beyond the basic diagnostic, our median invoice was $325, and 76 percent landed between $150 and $750. A $325 repair on a working nine-year-old system is not a replacement conversation. It is a Tuesday.
The $5,000 rule, run on real numbers
The rule of thumb: multiply the age of the system in years by the repair estimate. Over $5,000, lean replace. Under, lean repair.
Applied to our actual median repair of $325:
| System age | 5,000 rule score | What it says |
|---|---|---|
| 8 years | $2,600 | Repair, comfortably |
| 12 years | $3,900 | Repair |
| 15 years | $4,875 | Right at the line |
| 18 years | $5,850 | Lean replace |
| 20 years | $6,500 | Replace |
And at our p75 repair of $481, the line arrives at about 10 years instead of 15.
That is the whole value of the rule: it tells you that age matters more than the repair price for most decisions. A big repair on a new system is still worth doing. A modest repair on a twenty-year-old system usually is not, because another one is coming.
What our replacements actually invoice
The other half of the decision is a five-figure number. A full system replacement in the Sacramento area generally runs $9,500 to $25,000, and we quote a range rather than a single figure on purpose, because the spread is real: system type, capacity, the state of the ductwork, electrical work and code compliance all move it. A like-for-like changeout and a full electrification with panel work are not the same project, and no honest number exists before someone has seen the house.
So the practical comparison is usually a few hundred dollars now against five figures later. That framing matters, because a lot of replace-now advice online quietly assumes the replacement is cheap.
The four questions that actually decide it
1. How old is it? Under 10 years, repair almost always wins. Over 15, every repair is buying time on borrowed equipment. Between 10 and 15 is where the other three questions do the work. ENERGY STAR sets its own thresholds a little lower, suggesting you consider replacement once a heat pump or air conditioner passes 10 years and a furnace passes 15.
2. Is this the first repair, or the third? One failure is a component. Three failures in two seasons is a system telling you something. We keep the history, and if we have been out before, ask us what we have already replaced.
3. What failed? A capacitor, a contactor, a fan motor or a control board are ordinary parts with ordinary prices. A compressor or a leaking evaporator coil on an older system is a different conversation, because you are putting a major component into a system whose other major components are the same age.
4. What refrigerant does it use? This is the Sacramento question people miss. If the system runs R-22, it was phased out and the cost of servicing it reflects that. Systems built around R-410A are now being superseded in turn by the current low-GWP refrigerants. A major refrigerant-circuit repair on an obsolete system is money spent on a platform that is going away. Our refrigerant mandate guide explains where that stands.
When repair is clearly right
- The system is under 10 years old.
- The failed part is a normal wear component.
- It has been reliable until now.
- The repair lands in the ordinary range, which for us means the $150 to $750 band that three quarters of our repairs fall into.
- You have a warranty. Check before you agree to anything.
When replacement is clearly right
- The system is 15 or more years old and needs a major component.
- It uses R-22 and needs refrigerant-circuit work.
- The repair estimate is a meaningful fraction of a replacement.
- It has failed repeatedly in the same season. ENERGY STAR lists frequent repairs alongside rising energy bills as a replacement signal, because it usually means the equipment has become less efficient.
- It cannot keep the house comfortable on a design day even when working, which is a sizing or ductwork problem a repair will not touch. If that is your situation, start with why the AC runs but the house will not cool. ENERGY STAR makes the same point: rooms that are too hot or too cold usually mean improper operation, duct problems or inadequate insulation rather than a failed part.
The middle ground nobody mentions
Between "fix it" and "replace it" there is a third answer: fix it now, plan the replacement. A $325 repair that buys a working summer while you get quotes, look at rebates and replace in the shoulder season is often the best financial outcome available. Replacing in October or March, rather than during the first 105 degree week when everyone else is calling, gets you a considered decision instead of an emergency one.
What that looks like in practice: make the repair, then use the off-season to get the load calculation done, check what SMUD rebates apply, and decide on system type without a deadline. The replacement guidelines page covers what to look at when you get there.
What about efficiency savings?
Worth including, worth not overstating. A new system is more efficient than a fifteen-year-old one, and in Sacramento it will show up on a summer bill. It is rarely enough on its own to justify replacing equipment that still works, and a new high-efficiency system on leaky attic ducts delivers a fraction of what the label promises. If lower bills are the goal rather than a failure, the cheaper interventions come first: how to make your AC more efficient covers them in order.
Should I repair or replace my AC?
Repair if it is under 10 years old, this is not a repeat failure, and the estimate is in the ordinary range. Replace if it is 15 or more years old and needs a major component, uses R-22, or has failed repeatedly. Between those, run the age times repair-cost arithmetic and weigh whether you would rather choose a replacement in the off-season or have one chosen for you in August.
Is it worth repairing a 15-year-old AC?
For a small repair, often yes. For a compressor or a coil, usually not. At fifteen years the system is at the point where the $5,000 rule crosses on an average repair, and the components that have not failed yet are the same age as the one that did.
How much does an HVAC repair cost?
Our own residential repairs beyond the basic diagnostic had a median of $325, with three quarters between $150 and $750 and a tail into the low thousands for major work. Anyone quoting a precise figure before seeing the system is guessing.
Get the decision made properly
The right answer depends on your system's age, its history, what failed, and what a replacement would actually cost for your house. We give you both numbers and the reasoning, and we do not treat every repair as a sales opportunity. See our guarantee and rates, book AC repair, or contact us if you would rather talk it through first.