Beat the summer heat. Air conditioning installations.

Air Conditioning Repair London

F-Gas certified engineers diagnose and repair domestic split and multi-split air conditioning systems across London. Fixed prices after diagnosis, no surprises.

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Engineer servicing an outdoor air conditioning condenser unit at a London home

5 out of 5 stars

Our AC stopped cooling in a heatwave. Renzy were out the next day, found a refrigerant leak, fixed it, and recharged the system - all for the price they quoted on the phone.

Priya, from Hammersmith

How a repair visit works

We always diagnose before quoting. You get a fixed price for the repair before any work begins.

Tell us the symptoms

Book online or call us with what the system is doing - or not doing. We'll book a same-week visit where possible.

On-site diagnosis

We test the system, find the fault, and give you a fixed-price quote before any work starts.

Repair and re-test

We carry out the repair, re-test the system end to end, and document the work for your records.

Common faults we fix

Most domestic AC problems come down to a handful of issues. Here are the ones we see most often and what's usually behind them.

Not cooling properly

Often a refrigerant leak, blocked filter, or a faulty sensor. We pressure-test the system, find the leak, and recharge after repair.

Water leaking from the indoor unit

Usually a blocked or frozen condensate drain. We clear the drain, check the slope, and flush the pump if one is fitted.

Strange noises or vibration

Loose fan blades, worn bearings, or refrigerant flow noise. We open the unit, inspect, and replace the failing part.

Remote or controls not responding

Battery, IR sensor, or control board issue. We diagnose with manufacturer software and repair or replace the failed component.

Error code on the display

Every brand has its own fault-code language. We read the code, interpret it against the manufacturer's service manual, and quote the fix.

Why Renzy

Repairs done right the first time, by engineers qualified to work on the gas inside your system.

F-Gas certified

F-Gas certification is the legal qualification needed to recover, top up, and work with refrigerant gas. Your repair is handled safely and documented properly.

Diagnose first, fix second

We test the system thoroughly before suggesting a fix. You get a clear explanation of what's wrong and a fixed price before we start.

All major brands

We repair Daikin, Mitsubishi, Panasonic, LG, Samsung, and most other domestic split and multi-split systems.

Air Conditioning Repair across London

Our F-Gas certified engineers repair air conditioning across these London areas

AC repair questions

Do you repair domestic air conditioning systems?

Yes, we repair domestic single split and multi-split air conditioning systems. Common issues include weak cooling, water leaking from the indoor unit, unusual noise, bad smells, blocked drains, dirty filters, sensor faults, and fault codes on the controller.

Why is my air conditioning not cooling properly?

Common causes include blocked filters, dirty internal parts that the air passes through, poor airflow, an undersized unit, incorrect settings, a drainage issue, or a refrigerant problem. Refrigerant is the gas inside the system that moves heat from indoors to outdoors. Only an F-Gas certified engineer should work on that sealed part of the system.

Which air conditioning brands do you install?

We install leading domestic brands including Daikin, Mitsubishi Electric, Samsung, LG, Fujitsu, and Panasonic. We will explain the practical differences, such as noise levels, warranty, controls, and how tidy the indoor unit looks, then recommend a system that fits your rooms and budget.

Does air conditioning need servicing?

Yes. Domestic air conditioning should usually be serviced once a year, or more often if it is used heavily. Servicing includes cleaning filters, checking drainage, testing performance, checking for obvious leaks, and making sure the system is running safely and efficiently.

How noisy is domestic air conditioning?

Modern indoor units are usually quiet on low fan speeds, often quiet enough for bedrooms. Outdoor units make more noise than indoor units, so placement matters. During the survey, we consider neighbouring windows, balconies, and shared walls so the system is comfortable for you and considerate for nearby properties.

Can air conditioning heat a room in winter?

Yes, many domestic air conditioning units can also heat. They work as an air source heat pump, which means they move heat rather than creating it directly like an electric heater. This can make them an efficient way to warm a bedroom, loft room, or study.