Quick answer: An R290 dehumidifier uses propane as its refrigerant. Propane has a global warming potential (GWP) of 3, against 2,088 for R410A (US EPA), and it stays efficient at higher condensing temperatures. That is why new industrial dehumidifiers are moving from R410A to R290. The trade-off is flammability: R290 units are built and installed to a charge limit and safety standard.
Quick answer
- R290 is propane, safety class A3, GWP 3. R410A is safety class A1, GWP 2,088.
- EU and US rules are phasing out high-GWP refrigerants in self-contained cooling equipment, so R290 is the long-term choice for new units.
- An R410A machine cannot be recharged with R290. The two need different compressors, components and safety design.
Yakeclimate builds industrial dehumidifiers with R290 across its portable, floor-standing and ceiling-mounted ranges. Ask for the R290 data sheet of the model you are comparing.
What is an R290 dehumidifier?
It is a refrigerant (compressor) dehumidifier whose cooling circuit is charged with R290, which is high-purity propane. The unit works the same way as any refrigerant dehumidifier: a fan draws humid air across a cold evaporator, water condenses and drains away, and the air is reheated by the condenser before it returns to the room. The refrigerant changes the circuit design, the safety design and the regulations that apply. It does not change how the machine is used day to day.
R290 vs R410A at a glance
| Property | R290 (propane) | R410A |
|---|---|---|
| Safety class (ASHRAE 34) | A3: low toxicity, higher flammability | A1: low toxicity, no flame propagation |
| GWP (US EPA reference table) | 3 | 2,088 |
| Critical temperature | About 97 °C (NIST) | About 72 °C |
| Operating pressure | Lower | Higher |
| Refrigerant charge | Smaller for the same capacity; capped by product standards | Larger; no flammability cap |
| Regulatory outlook | Long-term option in the EU and US | Being phased out of many new-equipment categories |
Related: NIST.
Why are manufacturers moving to R290?
Regulation is the main driver.
- European Union. Regulation (EU) 2024/573 bans placing on the market new self-contained air-conditioning and heat-pump equipment of 12 kW or less that uses fluorinated gases with a GWP of 150 or more from 1 January 2027 (EUR-Lex). R410A is far above that threshold; R290 is far below it.
- United States. The EPA Technology Transitions rule limits the GWP of refrigerants in many new air-conditioning and heat-pump systems to 700 from 2025 (US EPA). R410A exceeds that limit.
How a specific dehumidifier is classified under these rules depends on its type, capacity and market, so check the category for your model and country. The direction is the same everywhere: high-GWP refrigerants are leaving new equipment, and servicing them will get more expensive over a machine's 10–15 year life. Buying R290 now avoids that risk.
Does R290 perform better in hot conditions?
It has more headroom. A refrigerant's capacity and efficiency fall as the condensing temperature approaches its critical temperature. R290's critical temperature is about 97 °C, roughly 25 °C higher than R410A's, so an R290 circuit loses less performance when the condenser runs hot. In a dehumidifier that matters, because the condenser sits in the same airstream as the evaporator and reheats the dried air, so it runs warmer than the condenser of a split air conditioner on a mild day.
In practice, performance depends on the complete machine: compressor, coils, airflow and controls. Compare models on rated water removal and power input at the same test condition, for example 30 °C/80 % RH, and ask for data at your own site condition. Our guide to what a daily water removal rating means explains how rating conditions change the numbers.
Is an R290 dehumidifier safe?
Yes, when it is built to the product safety standard and installed as specified. Propane is flammable, so the standard limits how much refrigerant a unit may contain and sets rules for sealed circuits, ignition-source-free electrical design, leak protection and installation space.
The international standard for heat pumps, air conditioners and dehumidifiers is IEC 60335-2-40. Its 2022 edition raised the allowable propane charge substantially; for a standard split system the limit rose from 340 g to 988 g (ASERCOM). Industrial dehumidifiers with larger capacities may use more than one refrigerant circuit to stay within the charge limit.
How much propane is in a dehumidifier, and what happens if it leaks?
The charge is small compared with the room it serves. Small R290 dehumidifiers typically hold tens of grams; the exact charge is printed on the rating label. Propane can only burn when it reaches its lower flammability limit (LFL) of about 0.038 kg/m³, or 2.1 % by volume (ASHRAE 34). A worked example shows the margin:
| Case | Charge | Room volume | Concentration if the full charge leaked and mixed | Share of LFL |
|---|---|---|---|---|
| Small unit in a 12 m² room | 65 g | 30 m³ | 2.2 g/m³ | about 6 % |
| Industrial unit in a 100 m² storeroom | 500 g | 300 m³ | 1.7 g/m³ | about 4 % |
Propane is heavier than air, so a leak can collect near the floor before it mixes. That is why the standard sets a minimum room size for each charge, requires sealed joints and ignition-free electrical parts inside the unit, and asks for floor-level ventilation in small or closed spaces.
On site, follow the installation manual: keep the unit in a ventilated space of at least the stated room size, keep open flames and sparks away, and use technicians trained for hydrocarbon refrigerants for any service work.
Can you convert an R410A dehumidifier to R290?
No. R410A runs at much higher pressure, needs a different compressor displacement and lubricant, and its electrical parts are not designed for a flammable refrigerant. Switching refrigerant means a different machine. If you have an R410A fleet, plan to replace units with R290 models at the end of their service life.
How are R290 dehumidifiers shipped?
Equipment that contains a flammable refrigerant is shipped as dangerous goods, usually under UN 3358 (refrigerating machines containing flammable, non-toxic, liquefied gas). Small charges can qualify for simplified conditions. Your freight forwarder confirms the classification, labels and documents for the route and transport mode. Large volumes of R290 appliances ship worldwide every year, so this adds paperwork, not a barrier.
R290 dehumidifiers from Yakeclimate
Our refrigerant dehumidifiers are designed, built and tested in our own factory in Hangzhou, with capacity verified in our enthalpy-difference laboratory. R290 is available across the range:
| Range | Format | Rated removal (30 °C/80 % RH) |
|---|---|---|
| RYCM portable | On wheels, for temporary and zoned drying | 60–138 L/day |
| RYCF floor-standing | Fixed, for warehouses, workshops and production areas | 240–960 L/day |
| RYDZ ceiling-mounted and ducted | Above the ceiling, direct-air or ducted | 26–960 L/day |
Related: RYDZ ceiling-mounted and ducted.
Tell us the model, the room size and your site temperature and humidity, and we will send the R290 configuration and its rated data.
FAQ
Frequently asked questions
Is R290 better than R410A for a dehumidifier?
For new equipment, yes in most cases. R290 has a far lower GWP, keeps more capacity at high condensing temperatures and is not affected by the HFC phase-down. R410A's advantage is that it is non-flammable, which simplifies installation in some locations.
What does "R290" mean on a dehumidifier label?
It means the refrigerant circuit contains propane (R290). The label also states the charge in grams and carries a flammable-refrigerant warning symbol.
Does an R290 dehumidifier remove less water?
Not by design. Water removal depends on the whole unit and the test condition. Compare the rated L/day and power input of R290 and R410A models at the same condition.
Can R290 dehumidifiers be used in greenhouses, warehouses and energy storage rooms?
Yes, within the installation rules of the standard: a minimum room size for the charge, adequate ventilation and no ignition sources next to the unit. Tell us the installation space and we will confirm the model and charge.
References
- US EPA, Technology Transitions GWP Reference Table.
- US EPA, Technology Transitions Program.
- Regulation (EU) 2024/573 on fluorinated greenhouse gases, EUR-Lex.
- ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants.
- NIST Chemistry WebBook, Propane: phase change data.
- ASERCOM, Approved flammable refrigerants for use in ACs according to IEC 60335-2-40.
