Refrigerant is not 'AC gas' you top off like a tank of fuel. It is a working fluid in a closed loop. If the level is low, there is a leak. Adding refrigerant without finding the leak is a subscription to the same service call.
The industry is also in the middle of a refrigerant change. R-22 is long gone. R-410A is being phased down. Newer systems use lower-GWP blends such as R-454B. That affects equipment cost, repair options, and what you should do with a working 410A system.
The refrigeration cycle in one kitchen analogy
The compressor squeezes refrigerant, which gets hot. The outdoor coil dumps that heat to the backyard air. The refrigerant then expands, gets cold, and the indoor coil absorbs heat from your house air. The blower throws that cooled air into the rooms. Repeat.
Oil travels with the refrigerant to lubricate the compressor. Wrong charge, wrong oil, or a restriction and the compressor eats itself. That is why 'just add a pound' from someone without gauges and a scale is gambling.
R-22: if you still have it
R-22 production for new equipment is over. Remaining R-22 is expensive. A leaking R-22 system is usually a repair-vs-replace conversation, not a 'top it off every summer' plan. If someone offers a cheap R-22 recharge, ask where the leak is and what a replacement costs with today's equipment. Do the 15-year math.
R-410A: still everywhere, not forever
Most systems from the last 15 years use R-410A. You can still service them. Virgin 410A will get tighter and more expensive as the phase-down continues. That does not mean you must rip out a healthy 410A system. It means a major leak on an old 410A unit may push you toward replacement sooner than it would have in 2018.
There is no honest 'drop-in' that turns a 410A system into a 454B system. Different oils, different pressures, different components, different safety classification. Anyone selling a can-and-a-prayer conversion is not doing you a favor.
R-454B and A2L
R-454B is one of the main replacements in new residential equipment. It has a much lower global-warming potential than 410A. It is classified A2L: mildly flammable. That is not 'your house is a grill.' It does mean manufacturers and codes want proper charge limits, sensors in some applications, and techs who are trained to handle it.
New equipment, new coils, new line-set practices (or thoroughly flushed/replaced lines), and a permitted install. Mixing leftover 410A parts with a 454B condenser is how you get a callback and a dead compressor.
What this does to your wallet
- New systems cost more than the last generation did, in part because of the transition, sensors, and inventory.
- 410A service on older machines will trend more expensive over time.
- A small, located leak on a young 410A system is still worth repairing.
- A rotting coil on a 12-year-old 410A system is often replace, not recharge.
Do not panic-replace a working system
A tight, maintained 410A unit does not become illegal to own because new production shifted. Replace it when the equipment, efficiency, or leak history says so — not because a salesman said 410A is 'banned tomorrow.'
If you have a leak, we find it, show you the photo, and give you repair and replace numbers with the refrigerant that system actually uses. No mystery cans, no drop-in fairy tales.