At Keystone London, we provide same-day emergency air conditioning repairs across West, Southwest, and Central London.
Our experienced engineers are trained to work on all major AC brands and carry essential parts to ensure fast, efficient repairs - often completed on the first visit. We diagnose faults quickly and deliver reliable, high-quality workmanship with minimal disruption.
You’ll also receive a clear record of the work carried out, making future maintenance straightforward and helping prevent further issues.
Our no-fix, no-fee policy gives you complete peace of mind - you’ll only pay once your air conditioning system is up and running again.
Looking after your Air Conditioning is what we do best at Keystone London.
Whether your current air conditioning system needs a little attention or it’s time for a full replacement to keep your home cool and comfortable
Local, reliable air conditioning engineers serving London - here’s why customers trust us:
Fully Qualified & F-Gas Certified
Our engineers are certified to safely install, service, and repair all types of air conditioning systems.
Customer-Focused from Start to Finish
Friendly, professional, and committed to delivering a smooth, stress-free experience from the first call to completion.
Experts in Fast, Reliable Solutions
We diagnose faults quickly, source the right parts fast, and restore your cooling system with minimal disruption.
From regular maintenance to emergency repairs, we make air conditioning simple and hassle-free.
We suggest annually to ensure the guarantee is kept up to date and to provide maximum efficiency and reliability.
A boiler service in Coventry typically falls between £50.00 and £80.00, depending on the amount of boiler fuel needed, the type of boiler (oil, gas or electric and the manufacturer and model), and the position your boiler was installed.
For an accurate figure, reach out to our friendly team for a free quote.
Common signs include strange noises, leaks, low pressure, and uneven heating across the radiators.
Repair costs vary depending on the issue, a cheap repair would cost around £100.00 and a more in depth repair with replacement of a major part such as a fan, PCB or pump can be up to £450.00
A boiler service usually takes 40 minutes to an hour, depending on if the boiler has been regularly maintained—if not, it may take longer.
It's generally not recommended, as boilers are complex and potentially dangerous systems. It's best to leave repairs to qualified professionals. Problems such as electrocution, gas leaks and water leaks could occur should the boiler be repaired incorrectly.
Boiler repairs can be completed within 15 minutes, however more complicated fixes can take up to 3-4 hours.
Turn off the boiler and water supply, and contact a qualified engineer immediately to assess and repair the issue. We may suggest opening the taps and opening the drain valve if there is one outside, or using a hose pipe if there is one internally on a radiator.
Regular maintenance, such as annual servicing, can help prevent many common boiler issues. It is advised to bleed radiators when required and ensure you have repressured the boiler if you have a sealed system. You can check for a pressure gauge on the boiler.
Check for obvious issues like power supply and thermostat settings. Ensure the gas supply is turned on and check for low water pressure within the boiler if you have a sealed system. If you can't identify the problem, contact a professional for diagnosis and repair.
It depends on the extent of the damage and the age of the boiler. We usually suggest that a boiler 10 years or older that requires a repair of more than £300.00, is beyond economical repair.
