Every summer the AC gets weak, a tech comes out, adds "a pound of Freon," and it works again. Until next year. It feels routine. It isn't. A sealed system shouldn't lose refrigerant, so if yours needs a yearly top-off, you're paying to leak it right back out. Here's what a recharge actually costs and the one question that ends the cycle.
An AC is a closed loop: it doesn't burn refrigerant the way a car burns gas. If it's low, it leaked. Topping it off without finding the leak is a temporary patch you'll pay for again every year, and it's getting more expensive as older refrigerants (like R-22) phase down. A recharge commonly runs $150–$600+ depending on the refrigerant type and amount; an R-22 recharge can run far higher per pound. The question that ends the loop: "Can you do a leak search and show me where it's leaking before we add more?" Annual "just add a pound" with no leak search is a yellow flag worth a second opinion.
Refrigerant isn't a consumable. Your AC moves the same refrigerant in a sealed circle, over and over, for the life of the system. Nothing about normal operation uses it up. So there are really only two explanations for a system that's low:
| Cause | What it means |
|---|---|
| There's a leak | The honest answer the vast majority of the time. Could be a coil, a fitting, a Schrader valve, or a pinhole. It will keep leaking until it's repaired. |
| It was never charged correctly | An install or prior-service error. Still a fixable, findable problem, not a reason to top off forever. |
What it is not is "normal wear" or "they all need a little every year." That framing is how a $200 visit quietly becomes a $200 visit every single summer, for a leak that a one-time repair would have ended.
Recharge pricing swings a lot, mostly on which refrigerant your system uses and how much it needs. Rough ballparks:
| Item | Typical range |
|---|---|
| Service call / diagnostic | $75–$150 |
| Recharge, newer refrigerant (e.g. R-410A), typical top-off | $150–$450 |
| Recharge, R-22 (phased-down, older systems) | much higher per pound |
| Electronic leak search | often $100–$300 |
| Leak repair | varies widely by location of leak |
You don't have to diagnose anything yourself. You just have to redirect the visit from "add more" to "find the leak." Say it plainly:
A good tech welcomes these. Finding leaks is the actual job. Someone who shrugs and says "they all need a little every year" is giving you the answer you came here checking on.
A recurring leak often becomes a replacement pitch. Before you sign anything, run that quote through our free autopsy tool. It reads the numbers line by line, flags what's fair vs. padded, and gives you the questions to ask. No phone number required.
Run the free quote autopsy →Not necessarily a scam, but rarely the right answer. Here's the read:
| The situation | The read |
|---|---|
| One-time recharge after a repaired leak, shown the repair | Fair. That's how it's supposed to work. |
| Recharge with a documented leak search and a repair plan | Reasonable. They found it and have a plan. |
| Annual "just add a pound," no leak search ever offered | Yellow flag. You're paying to leak it back out. Ask for a leak search or get a second opinion. |
| Repeated R-22 top-offs on an old system | Run the repair-or-replace math. The recurring cost is the real story. |
The exact questions to redirect a top-off visit toward finding the leak, what a recharge should cost by refrigerant type, and when recurring recharges mean it's time to do the repair-or-replace math. One email, no spam.
It varies widely by refrigerant type and amount. A typical recharge on a newer system (R-410A) often runs $150–$450 including the service call, while older R-22 systems cost considerably more per pound because that refrigerant has been phased down. A leak search is usually an additional $100–$300. These are 2026 ballparks; regional pricing varies. The bigger cost question is usually whether you're paying for it every year instead of fixing the leak once.
It shouldn't. An air conditioner is a sealed, closed loop. It doesn't consume refrigerant in normal operation. If it's low, it leaked, or it was never charged correctly. A yearly top-off without a leak search means you're paying to replace refrigerant that's escaping through a leak that hasn't been repaired. Ask the technician to do a leak search and show you where it's leaking before adding more.
Not automatically: a one-time recharge after a repaired leak, or a monitored slow seep with a repair plan, can be legitimate. It becomes a problem when it's an annual ritual with no leak search ever offered. At that point you're funding the leak instead of fixing it, and it's a yellow flag worth a second opinion. The test is simple: has anyone actually searched for the leak?
Usually no, especially on older R-22 systems where refrigerant is expensive and getting scarcer. Ask what it would cost to repair the leak versus continuing to recharge every year, and add up the recurring cost. For an aging system, repeated recharges can be the signal to run the repair-or-replace math rather than keep paying for top-offs.
A leak search uses electronic detectors, dye, or pressure testing to locate where refrigerant is escaping. It's often $100–$300, and it's the step that turns an endless top-off into a one-time fix. If your system has needed refrigerant more than once, a leak search is almost always worth it. It's the difference between treating the symptom and fixing the cause.