What is the main difference between R407C and R410A?

R407C has a significant temperature glide of around 7°C and lower operating pressures than R410A. R410A has near-zero glide and higher pressures. Both use POE oil.

Can R407C be charged in vapour phase?

No. R407C must be charged as a liquid due to its temperature glide. Vapour charging causes fractionation and alters the blend composition.

Which has lower GWP, R407C or R410A?

R407C has a lower GWP (1774) than R410A (2088). Both are subject to F-Gas phase-down restrictions.

R407C vs R410A UK: Key Differences for Commercial AC Engineers

R407C and R410A in UK Commercial AC

R407C and R410A are two of the most common refrigerants in the UK commercial air conditioning installed base. While both are A1 non-flammable HFC blends used in similar-looking split and multi-split systems, they have distinct properties that affect how they are charged and serviced.

Key Differences at a Glance

Property	R407C	R410A
GWP	1774	2088
Blend type	Zeotropic	Near-azeotropic
Temperature glide	~7°C	~0.1°C
Operating pressure	Lower	Higher
Oil type	POE	POE

Temperature Glide: The Critical Difference

R407C has a temperature glide of ~7°C — its bubble and dew points differ significantly. This means:

R407C must always be charged as a liquid to prevent fractionation
PT charts show separate bubble and dew point pressures
Never top up R407C with vapour from a low cylinder

R410A has near-zero glide and behaves closer to a single-component refrigerant in practice.

Practical Servicing Notes

R407C operates at lower pressures, making it more forgiving for engineers transitioning from R22 systems. R410A requires high-pressure-rated gauge sets. Browse our full refrigerant range for both gases.