R407C vs R410A: Which Refrigerant for Your System? (UK)

R407C and R410A are both HFC blends, but they suit different jobs: R407C is a lower-pressure gas commonly used to retrofit old R22 systems, while R410A is a higher-pressure refrigerant used in dedicated air conditioning and heat pump equipment. They are not interchangeable. This guide compares them for UK engineers.

R407C vs R410A at a glance

Property	R407C	R410A
GWP	1,774	2,088
Composition	R32/R125/R134a (23/25/52)	R32/R125 (50/50)
Operating pressure	Lower (similar to R22)	Higher (~50-70% above R22)
Temperature glide	High (~7K)	Very low (near-azeotrope)
Safety class	A1	A1
Main use	R22 retrofit, mixed systems	Dedicated AC and heat pumps

When to use R407C

R407C operates at pressures close to R22, which makes it a common retrofit choice for older R22 air conditioning and refrigeration systems. Its high glide means it must be liquid-charged and fully recharged after a leak. See our R407C R22 retrofit guide.

When to use R410A

R410A runs at significantly higher pressure and was designed for dedicated air conditioning and heat pump equipment built to handle it. You cannot put R410A into a system designed for R22 or R407C. As R410A faces quota pressure, new equipment is moving to R32 and R454B – see our R410A replacement guide.

Can you swap one for the other?

No. R407C and R410A have very different pressures and are designed for different equipment. Using the wrong one risks poor performance, component damage and safety hazards. Always match the refrigerant to the system design.

Buying refrigerant in the UK

Refrigerant Gas Supplies Ltd supplies F-Gas compliant refrigerant to certified UK engineers – R407C and R410A. Browse the full refrigerant gas range. F-Gas certification is required to purchase.

Frequently asked questions

What is the difference between R407C and R410A?

R407C is a lower-pressure, high-glide blend often used to retrofit R22 systems. R410A is a higher-pressure, near-azeotropic refrigerant used in dedicated AC and heat pumps. They are not interchangeable.

Can I use R410A instead of R407C?

No. R410A operates at much higher pressure and is only for equipment designed for it. Using it in an R22 or R407C system is unsafe and can cause damage.

Which has the lower GWP, R407C or R410A?

R407C has a slightly lower GWP (1,774) than R410A (2,088), though both face F-Gas quota pressure.

Is R407C still used?

Yes. R407C remains common for servicing existing systems and retrofitting old R22 equipment, as its pressure profile is close to R22.