Most dehumidifiers use refrigerant, but it is usually not freon

Modern dehumidifiers contain a refrigerant that cools air to pull moisture out, but the refrigerant is typically not freon. Freon (the brand name for CFC and HCFC refrigerants) was phased out in the United States starting in the 1990s because it damages the ozone layer. Most dehumidifiers made in the last 15 to 20 years use HFC or HFO refrigerants instead — chemicals that do not harm the ozone layer.

The confusion happens because people often use "freon" as a catch-all term for any refrigerant in cooling equipment. If your dehumidifier is older than 2010, it may contain an HCFC refrigerant that is sometimes still called freon, though it is a different chemical than the original freon. If it is newer, the refrigerant is almost certainly HFC-134a or a newer HFO blend.

The type of refrigerant matters mainly if your dehumidifier leaks or needs service. A technician needs to know which refrigerant is inside to refill it correctly, and some refrigerants are more expensive or harder to find than others. For normal operation and moisture removal, the specific refrigerant type does not change how the dehumidifier works.

Key Takeaways

  • Freon was banned in the United States in the 1990s, so dehumidifiers made after 2010 do not contain it.
  • Modern dehumidifiers use HFC-134a or HFO refrigerants, which cool the air to extract moisture without damaging the ozone layer.
  • Older dehumidifiers (pre-2010) may contain HCFC refrigerants, which are sometimes called freon but are not the original ozone-damaging version.
  • The refrigerant type only matters if the unit leaks or needs professional service; it does not affect how well the dehumidifier removes moisture.

How dehumidifiers use refrigerant to remove moisture

A dehumidifier works by circulating refrigerant through a closed loop. The refrigerant evaporates in a cold coil (the evaporator), which cools the air drawn into the unit. When warm, humid air passes over this cold coil, the moisture condenses into water droplets, the same way water beads on a cold window. The water drips into a collection tank or drain line.

The refrigerant then flows to a second coil (the condenser), where it releases the heat it absorbed and returns to a liquid state. This cycle repeats continuously while the dehumidifier runs. The refrigerant itself never leaves the unit during normal operation — it stays sealed inside the coils and tubing. You do not breathe it, touch it, or handle it unless the unit develops a leak.

What refrigerants are in dehumidifiers today

HFC-134a is the most common refrigerant in dehumidifiers sold in North America. It has been the standard since the late 1990s and is widely available from HVAC suppliers. It is safe to handle during service and does not damage the ozone layer, though it does contribute to global warming if released into the air.

Newer dehumidifiers, particularly high-end models, may use HFO refrigerants such as HFO-1234ze or HFO-1234yf. These are designed to have even lower global warming potential than HFC-134a. They work the same way in the dehumidifier but are more expensive and less widely available for refills.

Some commercial or industrial dehumidifiers may still use HCFC-22 (sometimes called R-22), an older refrigerant that is being phased out. If you own a dehumidifier from the 1990s or early 2000s, it likely contains HCFC-22. This refrigerant does damage the ozone layer, which is why it is no longer used in new equipment, but it is still legal to service existing units that contain it.

When the refrigerant type matters

If your dehumidifier develops a leak, the refrigerant type determines what a technician can use to refill it. Using the wrong refrigerant can damage the compressor and ruin the unit. Before calling a technician, check your dehumidifier's manual or the label on the back or side of the unit — it will list the refrigerant type and the amount (usually measured in ounces or grams).

Refrigerant costs vary. HFC-134a is inexpensive and widely stocked. HFO refrigerants cost more and may require ordering. HCFC-22 is becoming harder to find and more expensive because it is being phased out. For an older dehumidifier, the cost of refrigerant plus labor may exceed the cost of a new unit, so it is worth comparing before you decide to repair.

Refrigerant leaks are also a safety and environmental concern. If you smell a sweet chemical odor near the dehumidifier or notice it is no longer removing moisture even though it runs, a leak is likely. Stop using the unit and contact a technician. Do not attempt to refill it yourself — refrigerant handling requires certification in most states.

Checking what refrigerant your dehumidifier contains

The easiest way to find out is to look at the unit itself. Most dehumidifiers have a label on the back panel or the side that lists the refrigerant type and charge amount. The label may say "R-134a" (HFC-134a), "R-22" (HCFC-22), "R-1234ze" (HFO), or similar. If the label is worn or missing, check the user manual or the manufacturer's website using your model number.

If you cannot find the information, contact the manufacturer's customer service with your model number. They can tell you the refrigerant type in seconds. This is worth doing before you call a repair technician, because you can then ask about the cost of service upfront.

Why freon is no longer used

Freon (CFC-12 and similar CFCs) was the standard refrigerant in air conditioners and dehumidifiers from the 1930s through the 1980s. In the 1970s, scientists discovered that CFCs released into the atmosphere break down ozone in the upper atmosphere, allowing more ultraviolet radiation to reach Earth. This led to the Montreal Protocol in 1987, an international agreement to phase out ozone-damaging chemicals.

The United States banned CFC production in 1995 and began phasing out HCFCs (a less damaging but still harmful class of refrigerants) in the 2000s. HCFC-22 production ended in 2020. HFC and HFO refrigerants do not damage the ozone layer, so they are the legal choice for all new dehumidifiers and air conditioning equipment.

If you own an old dehumidifier with freon, it can still be serviced, but technicians must recover and recycle the refrigerant rather than release it. This adds cost to repairs and makes it less economical to fix very old units.

Frequently Asked Questions

Is it safe to use a dehumidifier with a refrigerant leak?

No. Stop using it when ready. A refrigerant leak means the unit will not remove moisture effectively, and continued operation can damage the compressor. Modern refrigerants are not toxic to breathe in small amounts, but they should not be inhaled. Contact a technician to repair the leak.

Can I refill the refrigerant myself?

No. In most states, handling refrigerant requires an EPA certification. Improper refilling can damage the compressor, introduce moisture into the system, or create a safety hazard. Always hire a licensed HVAC technician for refrigerant work.

Does the refrigerant type affect how well a dehumidifier removes moisture?

No. HFC-134a, HFO, and HCFC refrigerants all work equally well at removing moisture. The type matters only for service, cost, and environmental impact — not for performance.

What should I do if my dehumidifier is old and has a refrigerant leak?

Compare the cost of repair (refrigerant plus labor) against the price of a new dehumidifier. For units older than 10 to 15 years, replacement is often cheaper and more efficient. Newer models use less energy and remove moisture faster.

Will my dehumidifier stop working when freon is phased out?

No. Freon has already been phased out — it has not been used in new dehumidifiers for over 20 years. If your unit contains freon, it is very old and can still be serviced, but the refrigerant is expensive and becoming scarce.