Refrigerant Recharge in Shelley
Refrigerant runs in a sealed loop. It does not burn off or wear out the way engine oil does, so a system that keeps coming up short has a leak somewhere, and adding more without finding it just books your next service call. In Shelley I find the hole, fix it, and then charge the system by measurement. The drive up from my shop in Aberdeen is part of the job, and I do the work myself.
What a short charge looks like from the living room
Most people call because the house will not cool down on a hot July afternoon, or because the system runs from noon until dark and the power bill shows it. Those are the late signs. The early ones are easy to miss: air at the registers that feels cool but never cold, a thermostat that falls a degree or two behind by evening, and an outdoor unit that almost never cycles off.
Go take a look at the outdoor unit. Two copper lines run into it, and the larger one wears foam insulation. Frost on that line, or on the service valve where it enters the cabinet, means the coil inside the house is running too cold, and a low charge is one of the usual reasons. Ice can also build on the indoor coil until air barely moves through it. If you see ice anywhere, switch the thermostat to fan only so it can thaw, and call me. Running a frozen system can send liquid back to the compressor, which is the most expensive part in the whole box.
Finding the hole before any refrigerant goes in
A leak search starts with the places leaks like to live. Flare fittings on mini splits and at the service valves. Brazed joints somebody made in a hurry. The small Schrader cores under the valve caps. Then the indoor coil, which on older copper systems is the most common culprit of all, because the thin tubing slowly corrodes and opens pinholes too small to see with your eyes.
I work through those with an electronic detector, bubble solution on every fitting I can reach, and, when the leak is small or the system is already empty, a standing pressure test with dry nitrogen that shows whether the loop holds. Some leaks turn up in ten minutes. Others take a second visit after the system has sat under pressure overnight. Either way you know where the leak is and what repairing it involves before you pay for a single pound of refrigerant.
Charging to the numbers on the day
Once the leak is repaired, the system gets pulled into a deep vacuum with a pump and a micron gauge until the air and moisture are out of it, because both of them damage a compressor from the inside. Then refrigerant goes in by weight, starting from the factory charge on the nameplate and adjusting for the length of the line set between the two units.
Weight gets the charge close, and the superheat or subcooling reading finishes it. On a system with a fixed metering device I check superheat, and on one with an expansion valve I check subcooling, both read against the actual indoor and outdoor temperatures that afternoon. A single pressure off one gauge cannot tell you whether a coil is getting the right amount, and that kind of guessing is how plenty of systems end up overcharged. Too much refrigerant floods the compressor and drives the head pressure up. Too little starves the coil. Both shorten the life of the equipment, and neither one shows up as a problem until it already is one.
Old R-22 equipment and the newer refrigerants
Plenty of houses around Shelley still run air conditioners old enough to use R-22. That refrigerant is no longer manufactured, and what remains is recovered and reclaimed supply that gets scarcer every season. A unit that holds its charge can keep running on R-22 for a long while.
Newer systems use R-410A, and the equipment coming out now has moved on again to newer refrigerants still. None of them are interchangeable. You cannot mix R-22 and R-410A in one system, and the substitutes sold for old equipment change how a system behaves and how it has to be serviced afterward. If converting an older system or switching refrigerant types is on the table, my page on refrigerant replacement covers what that involves and when it is worth doing. I will tell you plainly which side of that line your system sits on.
The point where I stop recommending a recharge
A recharge makes sense on a sound system with one leak that can be found and fixed. It makes less sense when the leak is in an indoor coil that has already been patched once, when the system has needed refrigerant two summers in a row, or when the compressor is loud, hot and old. At that point we would be paying to keep a failing part alive, and I will say so before you spend anything on it.
It can go either way. Sometimes a coil replacement gives an otherwise healthy system a good many more years. Sometimes the whole outdoor unit is past saving. I write up the repair and the replacement side by side on a written quote, and you decide. There is more on how I handle this service on the main refrigerant recharge page, past work sits in the gallery, and you can tell me what your system is doing through the contact page. If the warm air is coming from a wall-mounted head, mini split repair in Shelley covers that side of things.
Refrigerant goes in only after the hole has been found and repaired, so the charge stays where it belongs.
Factory charge by weight, finished with superheat or subcooling read against that afternoon’s temperatures.
Older systems get a plain answer on whether another recharge still makes sense, or whether the money belongs elsewhere.
Before you book a recharge in Shelley
Does refrigerant get used up over time?
No. It circulates in a sealed loop and should stay at the same charge for the life of the system. If yours is low, it leaked out somewhere, and topping it off without fixing that only buys time until the system is low again.
How can I tell my system is low on refrigerant?
Long run times that never quite cool the house, air at the registers that feels cool but not cold, frost on the larger copper line at the outdoor unit, or ice on the indoor coil. If you see ice, set the thermostat to fan only so it thaws, then call.
How do you find the leak?
I start where leaks usually live and work outward. An electronic detector along the coil and line set, bubble solution at the flare fittings, brazed joints and service valves, and a standing nitrogen pressure test when the leak is small. On older systems the indoor coil is a common culprit.
My system uses R-22. Can you still recharge it?
Sometimes. R-22 is no longer manufactured, so the remaining supply is reclaimed and harder to find every year. On an R-22 system with a real leak, I lay out repair against replacement on paper before putting any refrigerant in, so you are choosing with the full picture.
Why not add refrigerant until the gauge looks right?
Pressure alone does not tell you the charge. I measure superheat or subcooling against the indoor and outdoor temperatures that day, which is the only way to know the coil is getting the right amount. An overcharged system is as hard on a compressor as an undercharged one.
Can you come up to Shelley the same day?
Often, though I cannot promise it ahead of time because it depends on what is already on the schedule. Shelley sits on my regular route from Aberdeen, trip charges inside the hundred-mile radius stay small, and a house with no cooling at all moves ahead of routine work.
More from Larry in Shelley A leak on a wall-mounted head usually ties back to ductless mini split repair, since the flare fittings on those systems are a frequent source. If a new tank is on your list, water heater installation covers sizing for the household and venting beside the furnace. Humidifier installation is for houses that run dry once the heat comes on for winter, and seasonal tune-ups are where a slow leak usually gets caught before it costs you a hot afternoon. The rest of what I do in town is on the Shelley service page.