As the global HVAC industry shifts toward sustainability, choosing the right refrigerant for your air source heat pump has never been more critical. The debate often centers on two top contenders: R32 and R290.
Both are lauded as “green” alternatives to older gases like R410A, but they offer distinct advantages depending on your efficiency goals and environmental standards. In this guide, we break down the R32 vs. R290 comparison to help you make an informed decision.
What is R32? (The Balanced Performer)
R32 (Difluoromethane) is a HFC refrigerant that has become the standard for modern Inverter heat pumps.
GWP (Global Warming Potential): R32 has a GWP of 675, which is roughly one-third that of R410A.
Efficiency:Â It offers excellent thermal conductivity, allowing for a high COP (Coefficient of Performance) in both heating and cooling modes.
System Design:Â Because it is mildly flammable (A2L), it is easy to handle for most certified technicians and allows for smaller charge volumes in domestic units.
What is R290? (The Eco-Friendly Powerhouse)
R290 (Propane) is a natural refrigerant that is rapidly gaining traction in the European and premium commercial markets.
GWP (Global Warming Potential): R290 is the ultimate eco-friendly choice with a GWP of just 3. It has virtually zero impact on global warming.
High-Temperature Performance: R290 is famous for its ability to reach high flow temperatures (up to 75°C) without a backup heater, making it perfect for renovating older buildings with radiators.
Safety:Â As a hydrocarbon (A3), it is highly flammable. This requires specialized factory engineering and safety features, which is why it is often used in outdoor air source monobloc units.
Head-to-Head: The Key Differences
| Feature | R32 Refrigerant | R290 (Propane) |
| GWP Score | 675 (Low) | 3 (Ultra-Low) |
| Energy Efficiency (COP) | High | Superior (esp. in Cold Climates) |
| Max Outlet Temp | ~60°C – 65°C | Up to 75°C |
| Safety Class | A2L (Mildly Flammable) | A3 (Highly Flammable) |
| Eco-Friendliness | Better than R410A | Best in Class |
Which One Should You Choose?
Choose an R32 Heat Pump if:
You want a low-cost entry into high-efficiency heating.
You are looking for a compact domestic split system.
Your primary goal is balancing high quality with a mainstream, easy-to-service refrigerant.
Choose an R290 Heat Pump if:
You are aiming for a Net-Zero or carbon-neutral building.
You need high-temperature water (75°C) for industrial or renovation projects.
You want a future-proof system that exceeds the strictest F-Gas regulations.
Partner with a Leading Heat Pump Manufacturer
Whether you are looking for R32 Inverter units or R290 Ultra-Low GWP solutions, our China-based factory is ready to support your business. KLR Group offers OEM, customized engineering, and wholesale supply to help you lead the green energy transition.
Compare R32 and R290 Models
Contact our technical team today for a custom quote on our latest air source heat pump range.
