My AC needs gas every year — is that normal, or a leak I should be fixing instead of topping up?
One of my split units needs a refrigerant top-up every summer to cool properly — cooling fades, I call someone, they regas it, it's fine for a season, then the cycle repeats. The tech just keeps refilling it each year and taking the money.
But I've read that a sealed AC shouldn't lose refrigerant — it's not consumed like fuel. So:
- If it keeps needing gas, does that mean there's a leak I should be finding and fixing, rather than topping up forever?
- How does a proper leak test actually work?
- Am I being played by just paying for a refill every year?
I don't mind paying to fix it properly once, but paying to refill a leaking system every summer feels like throwing money away. What's the right way to handle this?
3 answers
Short answer: you're right and your instinct is correct — a sealed AC does not use up refrigerant, so a unit that needs gas every year has a LEAK. Repeatedly topping it up (without finding the leak) is the classic money-waster: you pay for gas that leaks straight back out, and you vent it into the atmosphere. The fix is a proper leak test and repair, then one correct recharge.
How a proper leak diagnosis works (what a good tech does instead of just refilling): 1. Pressure test / nitrogen test — the system is pressurised to see if it holds; a drop confirms a leak. 2. Locate the leak — soap-bubble solution on joints, an electronic leak detector, or UV dye added to the system then traced with a UV lamp on the next visit. Common leak points: the flare joints, the coil, and the Schrader valves. 3. Repair the leak (re-flare/replace the joint, fix the coil), pull a vacuum, then recharge to the correct amount — once.
Are you being played? Not necessarily maliciously — a quick regas is easy money and some techs default to it — but a unit that's needed gas for multiple summers should have had a leak test long ago. Insist on a leak test before any more top-ups.
Common mistake: accepting "it just needs gas" year after year. A sealed system that's truly full stays full. Get a proper AC service to find and fix the leak — one repair usually costs less than two or three summers of regassing, and it stops the cooling failing on the hottest day. (Related to the gas-refill-cost question, but the answer here is: don't keep refilling — fix the leak.) Anyone had a stubborn leak traced with UV dye — did it work?
Went through exactly this — three summers of "it needs gas" before a different tech did a leak test and found a weeping flare joint. Re-flared it, vacuumed, one proper recharge, and it's held ever since. I'd paid for three top-ups that all leaked away; the repair cost about the same as one and actually solved it. So yeah — insist on the leak test. A company that just wants to regas every year isn't fixing your problem, they're renting it to you.
Learned the "refrigerant isn't consumed" thing here and it changed how I deal with AC people — now if someone says "just needs gas" on a unit that had gas last year, I ask "where's it leaking, then?" It's a fair question and a good tech will respect it. Also on the R22 vs R410A point: older units on R22 gas cost more to top up, which makes fixing the leak (or replacing an old unit) even more worth it than refilling.
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