If your air conditioning is blowing warm air, running longer than normal, or icing up, low refrigerant is one of the most common causes. A regas restores the system to its designed operating pressure. If the system is beyond repair, our installation team can advise on a modern replacement.

What Is an AC Regas?

Refrigerant does not get used up in normal operation — if a system is low, it has a leak that must be found and repaired before the gas is topped up. This is a legal requirement under F-Gas regulations and the only approach that makes the repair last.

Signs Your AC Needs Regassing

• Not cooling as well as it used to
• Running continuously without reaching the set temperature
• Ice forming on the indoor unit or refrigerant lines
• Hissing or bubbling sounds near the unit

The Regas Process

We locate the leak using electronic detectors and UV dye. All engineers carry F-Gas certification. We work with all refrigerant types across Daikin, Mitsubishi Electric, Fujitsu, and all other major brands.

Refrigerant	Common in	Notes
R32	Systems from 2015 onwards	Lower GWP, now standard in new systems
R410A	Systems 2005-2020	Being phased out under F-Gas regulations
R22	Pre-2004 systems	Banned for topping up — replacement required

Frequently Asked Questions

How much does an AC regas cost in London?
A regas including leak detection, repair, and top-up typically costs £200-£350. See our full cost guide for context.

Can you top up without fixing the leak?
No — illegal under F-Gas regulations and won’t last.

My AC has R22 — what are my options?
R22 cannot legally be topped up. A new installation is required. Our cost guide covers current replacement prices.

Is my system worth repairing or replacing?
Systems over 12-15 years old are often better replaced. We provide honest advice and free quotes for domestic or commercial replacement installations.

Book a Regas

Call 020 7870 2333 for same-day bookings across Central, North, West, and South West London.

Simply Air Conditioning London — F-Gas certified since 2003.