What Is Freon, and Why Your Aircon Should Not Need a Yearly Refill

Freon, prion and refrigerant are three words for the same thing. Freon began as a brand name and stuck. If your unit has lost cooling and you want the gas checked and put back properly, that is our aircon freon charging service. This page is about what the gas does, and why the yearly refill people are sold is the wrong job.

What freon actually does

An aircon does not make cold. It moves heat. Inside, the fan blows room air across a cold coil, and the refrigerant in that coil soaks the heat up. The refrigerant carries it through the copper pipes to the outdoor unit, where the compressor squeezes it and the outdoor coil gives the heat away to the open air. Then the same refrigerant comes back inside and does it again.

1. 1 Inside, the gas takes heat out of the room air. The fan blows the air across a cold coil, the gas inside warms up and carries the heat away through the wall.
2. 2 Outside, the compressor squeezes it and the gas gives that heat up. The outdoor fan blows the heat into the open air, and the gas goes back inside to do it again.
3. 3 The ring is closed. Nothing is burned, nothing is used up, and the same charge goes round for the life of the unit. The only way the level drops is a hole somewhere on the ring.

Why a sealed system should not need topping up

Nothing in that loop burns or wears the gas out. It is not fuel, like petrol in a car or LPG in a stove. The amount put in at the factory, or at installation, is meant to stay for the life of the unit. Carrier says it in one line: a home aircon should never need to be recharged under normal circumstances.

So the level has only one way to drop. Carrier again: because the system is sealed, needing a recharge means there is a physical leak that must be repaired.

What it means when it does need gas: a leak

Low gas is a symptom, and the hole is the fault. Leaks are usually at the joints where the pipes meet the units, at the service valves, in a coil that has corroded, or along a pipe that was kinked or rubbed during an installation or a move. The signs that point at gas rather than something else:

• Cooling that faded slowly over weeks or months, with the fan still blowing normally.
• Ice or frost on the copper pipes outside, or on the coil inside.
• An oily, dusty patch at a pipe joint. Refrigerant carries a little oil round with it, and that oil marks where it escapes.
• A unit that was charged before and went weak again.

Ice is worth its own warning. Switch cooling off and let it thaw, because running a frozen unit strains the compressor. Our guide to an aircon freezing up covers what to do.

The annual freon refill is a myth

It is common to be told an aircon needs freon every year, the way a car needs an oil change. It does not, and believing it is how people end up paying for the same gas over and over. Here is what a yearly top-up costs you, apart from the top-up.

1. 1 A top-up restores the cold air and leaves the hole. The line goes back up and starts falling again the same day, and the band is reached again next season.
2. 2 A repair is the one that changes the shape. Find the leak, fix it, pull the moisture out and weigh the charge in once. After that the level has no reason to move.

You pay for the same gas every year

A top-up without a repair is gas that is already on its way out. It cools for a while, the level drops past the point where the unit can cool, and the same job is sold again next season.

The leak usually gets worse, not better

A slow leak at a joint or a corroded coil does not seal itself. Every season it is topped up rather than found, it has another season to grow.

The compressor pays for the time in between

A unit running low on gas runs long and hot trying to reach the setting, and the compressor is the part that takes it. That is a far bigger bill than any leak repair.

On R-410A the top-up is the wrong job anyway

Because it is a blend, adding to a system that has leaked leaves a mix that is not quite what the unit was built for. Recovering it and charging fresh is the correct work, and a cheap top-up skips it.

"Freon check" becomes "freon needed" too easily

A low reading on a gauge is a reason to look for a leak. A technician who goes straight from the reading to the bottle, with no leak named, has sold you gas and left you the problem.

A yearly visit is worth having. It should be a clean or a check-up that looks at the gas level among other things, and it should end with gas added only when a leak has been found and fixed.

The refrigerants in Philippine aircon units

Three cover almost every home unit here, and they are the three we work with. The one yours takes is printed on the nameplate of the outdoor unit. They run at different pressures and cannot be swapped or mixed.

R-22

Older units. The government calls it HCFC-22. Being phased out on a fixed DENR schedule, so it gets harder to find every year. An R-22 unit cannot be filled with a newer gas instead.

R-410A

Many split types sold before R-32 became common. A blend of two gases. When a blend leaks, what is left is no longer quite the same mix, so the usual answer is to recover it and charge fresh rather than add to it.

R-32

Common in newer split types. A single gas, with a much lower global warming potential than R-410A on the US EPA listing: 675 against 2,090.

The two newer gases are compared in more detail in R32 vs R410A, and the R-22 phase-out dates are on the freon charging page. The small cans on shopping sites are mostly R-134a, which is for cars and refrigerators and does not belong in a home split type.

What a proper freon job looks like

Carrier describes the order, and it is the same one we follow: diagnose, find the leak, repair it, pull the air and moisture out of the lines, then put the gas in until the manufacturer's specification is met. The specification is a weight, and it is on the nameplate. If a leak cannot be found or the gas has been contaminated, the job becomes a system reprocess, which empties and cleans the whole circuit first.

Before you agree to any gas going in, it is fair to ask three things. Which refrigerant does this unit take? Where is the leak? Will the charge be weighed in? A technician who has checked will answer all three without pausing.

Questions people ask

What is freon in an aircon?

It is the refrigerant, the gas that carries heat out of your room and dumps it outside. Freon started as a brand name and became the everyday word for it, and here many people say prion. All three mean the same thing.

Does an aircon need a freon refill every year?

No. The refrigerant goes round a sealed loop and is not used up. Carrier puts it plainly: a home aircon should never need to be recharged under normal circumstances. A unit that needs gas every year is leaking, and the useful job is finding the leak.

How do I know if my aircon is low on freon?

Cooling that faded over weeks or months, ice on the pipes outside, or an oily patch at a pipe joint. Cooling that stopped suddenly is usually something else, so a technician checks the power, the filter and the fans before anyone opens the gas.

When does an aircon genuinely need freon charging?

After a leak has been found and repaired, after a system reprocess, and sometimes after a unit is installed or moved, depending on the pipe run. In each case the gas goes in by weight against the nameplate, once.

Which freon does my aircon use?

It is printed on the nameplate of the outdoor unit. In Philippine homes it is almost always R-22 on older units, R-410A or R-32 on newer ones. They are not interchangeable.

Is it safe to top up freon myself?

No. The cans sold online are mostly the wrong gas for a home split type, the correct amount is a weight rather than a feeling, and adding gas does nothing about the hole it is leaking from.

When to call us

If cooling has faded and the filter is clean, book freon charging. The technician checks the level, looks for the leak and tells you what they found before any gas goes in. If the unit has been charged before and lost it again, say so when you book.

Other guides

• Aircon capacitor: what it does and the signs it has failed

  The humming outdoor unit, the fan that will not spin, and why the capacitor is tested first.

• Aircon freezing up: why ice forms and what to do

  Ice on the indoor coil or the pipes, how to thaw it safely, and the three causes behind it.

• Aircon making noise: which sounds are normal and which are not

  Clicks and water sounds that are normal, and the rattles, hisses and squeals that need a technician.

• Aircon not turning on: what to check, and the 3-minute wait after a brownout

  Remote, breaker, the compressor’s restart delay, and the flashing lamp that means a technician.

• AVR for aircon: when you need one and how to size it

  What an AVR does in a brownout, which units already protect themselves, and sizing it from the nameplate.

• Aircon watts: how many watts a 1 HP aircon uses, size by size

  Running watts and kWh per hour for each size, how to read the nameplate, and starting watts for a generator.

• Types of aircon: split type, window type, portable and centralized

  How each is installed, how noisy and costly to run it is, which rooms suit it, and what a clean has to reach.

• Aircon HP and room size: what each size cools, 0.5 to 2.5 HP

  The square metres each size suits in a shaded room and a hot one, with the arithmetic behind 0.6 HP.

• Aircon cleaning schedule: what to clean, and how often

  The filter every two weeks, a full clean by how hard the unit works, the deeper clean, and when in the year to book it.

• Common aircon problems, symptom by symptom

  Not cold, weak air, water inside, a smell, ice, noise, tripping and blinking: what each points to and what you can check.

• Aircon lifespan: how long it lasts, and repair or replace

  How many years a unit usually gives, what shortens it, and the signs that a repair is no longer worth it.

• Inverter vs non-inverter aircon: which costs less to run

  Kilowatt hours side by side at 2, 4, 8 and 12 hours a day, and the kind of use where a non-inverter is still fine.

• What size aircon for a bedroom, living room or kitchen

  Room by room: what each kind of room adds to the size you need, worked through for a sample two-storey house.

• Aircon energy saving tips that lower the bill

  Where the heat gets in, the setting and the fan, the timer, the cleaning, and reading the DOE energy label.

Sources: Carrier, “What is a Home AC Recharge?”, read 8 October 2026, no publication date shown; US Environmental Protection Agency, SNAP listing for residential and light commercial air conditioning (safety class and global warming potential of R-410A and R-32); DENR Environmental Management Bureau, Philippine Ozone Desk, HCFC phase-out schedule. Carrier is named as a source of facts and is not recommended.