Most dehumidifiers do not use freon—they use a different refrigerant or no refrigerant at all
The short answer: most household dehumidifiers use refrigerants other than freon, or they use no refrigerant at all. Freon (the brand name for CFC-12) was phased out in the 1990s because it damages the ozone layer. Modern dehumidifiers that cool air to remove moisture use newer refrigerants like HFC-410A or HFC-134a instead. Some dehumidifiers skip refrigerant entirely and use a desiccant material—usually silica gel—to absorb moisture from the air.
Understanding which type you have matters because it affects how the unit works, how long it lasts, and what to do if it breaks. A refrigerant-based dehumidifier (called a refrigerant dehumidifier) cools air so water condenses out, much like an air conditioner. A desiccant dehumidifier uses no refrigerant and works by passing air through a moisture-absorbing material, then heating that material to release the water.
Key Takeaways
- Freon (CFC-12) has not been used in dehumidifiers since the 1990s; modern units use HFC-410A, HFC-134a, or other approved refrigerants.
- Refrigerant dehumidifiers cool air to condense moisture, while desiccant dehumidifiers absorb moisture with silica gel and require no refrigerant.
- If your dehumidifier leaks refrigerant, you must call a licensed technician—refrigerant handling is federally regulated and cannot be done by a homeowner.
- Desiccant dehumidifiers work better in cold rooms and use more electricity, while refrigerant models work better in warm, humid spaces.
How refrigerant dehumidifiers remove moisture
A refrigerant dehumidifier works by circulating cold refrigerant through an evaporator coil. Warm, humid air from your room passes over this cold coil. The moisture in the air condenses into liquid water—the same way water beads on a cold window—and drips into a collection tank or drain line. The dried air then passes over a condenser coil (which is warm because it releases the heat the refrigerant absorbed) and returns to the room.
This cycle repeats continuously. The refrigerant itself never leaves the sealed system under normal conditions. It evaporates and condenses inside the coil network, absorbing heat from the room and releasing it outside the unit. The refrigerant is the working fluid that makes the whole process possible, but you never see it or handle it.
What refrigerants are used instead of freon
The refrigerant most commonly found in modern dehumidifiers is HFC-410A (also called R-410A or Puron). This refrigerant became the standard replacement after freon was banned. You will also see HFC-134a (R-134a) in some models, particularly older units made in the 2000s. Both are hydrofluorocarbon refrigerants that do not damage the ozone layer the way freon did.
A smaller number of newer dehumidifiers use HFO refrigerants (hydrofluoroolefins), which are even more environmentally friendly because they have lower global warming potential. The specific refrigerant used depends on the manufacturer and the model year. You can find out which refrigerant your dehumidifier uses by checking the nameplate on the back or side of the unit—it will list the refrigerant type and the amount (measured in ounces or grams).
Desiccant dehumidifiers use no refrigerant
A desiccant dehumidifier takes a completely different approach and contains no refrigerant at all. Instead, it uses a rotating wheel or cartridge filled with silica gel or another desiccant material. As humid air passes through the wheel, the desiccant absorbs the moisture. Then a heating element warms that same material to release the absorbed water, which is collected and drained away. The dried air is returned to the room.
Because desiccant dehumidifiers have no refrigerant, they have no compressor, no coils, and no sealed refrigerant system to leak. They are simpler mechanically and often quieter. However, they use more electricity than refrigerant models because they must heat the desiccant material continuously. They also work better in cold rooms—refrigerant dehumidifiers lose efficiency below about 65°F, while desiccant models perform well even in basements or unheated spaces.
What happens if refrigerant leaks from your dehumidifier
If your refrigerant dehumidifier stops removing moisture effectively, or if you notice oil stains or hissing sounds, the unit may have a refrigerant leak. Do not attempt to refill or repair the refrigerant yourself. Handling refrigerant is federally regulated under the Clean Air Act. Only a technician certified by the Environmental Protection Agency (EPA) can legally work with refrigerant systems.
Call a licensed HVAC or appliance repair technician. They will locate the leak, repair it, and recharge the system with the correct refrigerant. The cost varies depending on the size of the leak and the type of refrigerant, but expect to pay between $150 and $400 for a service call and repair. If the dehumidifier is old or the leak is large, replacement may be cheaper than repair.
How to tell which type of dehumidifier you have
Look at the back or side of your dehumidifier for a nameplate or label. If it lists a refrigerant type (such as HFC-410A, HFC-134a, or R-134a) and an amount in ounces, you have a refrigerant dehumidifier. If the label mentions a desiccant wheel, silica gel, or only lists electrical specifications with no refrigerant information, you have a desiccant model.
You can also identify the type by how it works: refrigerant dehumidifiers have a compressor that cycles on and off (you will hear it running), and they work best in warm rooms. Desiccant dehumidifiers run continuously without a compressor sound, and they work well in cold spaces. If you are still unsure, the model number on the nameplate can be looked up on the manufacturer's website to confirm the type.
Maintenance differences between the two types
Refrigerant dehumidifiers require little maintenance beyond emptying the collection tank or checking the drain line. The sealed refrigerant system should never need attention unless it leaks. You should clean the evaporator and condenser coils once a year by vacuuming the air intake and outlet vents to keep them free of dust and debris.
Desiccant dehumidifiers also need regular cleaning of air vents, but the desiccant wheel itself may need replacement after several years of use, depending on the model and how heavily the unit runs. Check your manual for the recommended replacement interval. Neither type requires you to add refrigerant or perform any sealed-system work yourself.
Frequently Asked Questions
Can I refill the refrigerant in my dehumidifier myself?
No. Refrigerant handling is federally regulated, and only EPA-certified technicians are legally allowed to work with refrigerant systems. Attempting to refill it yourself is illegal and can damage the unit or harm the environment. Call a licensed technician if you suspect a leak.
Is freon still used in any dehumidifiers?
No. Freon (CFC-12) has not been manufactured or used in new dehumidifiers since the 1990s. If you have an extremely old dehumidifier from the 1980s, it may contain freon, but it should not be used. Dispose of it through an appliance recycler that handles refrigerant systems.
Which type of dehumidifier is better—refrigerant or desiccant?
It depends on your space. Refrigerant dehumidifiers are more efficient in warm, humid rooms and use less electricity. Desiccant dehumidifiers work better in cold basements and unheated spaces, but they use more power. For a typical warm basement or humid bedroom, a refrigerant model is usually the better choice.
What should I do if my dehumidifier is leaking refrigerant?
Stop using the unit and call a licensed HVAC or appliance repair technician. Do not try to repair it yourself. The technician will locate the leak, repair it, and recharge the system. If the dehumidifier is old, compare the repair cost to replacement before deciding.
Do desiccant dehumidifiers need any special maintenance?
Desiccant models need regular cleaning of air vents to prevent dust buildup. The desiccant wheel or cartridge may need replacement after several years, depending on the model. Check your manual for the recommended replacement schedule. Unlike refrigerant models, they have no sealed system to leak or fail.