Air Conditioning Installation Costs in London 2025: What Homeowners Need to Know
If you’ve ever searched for air conditioning in London, you’ve probably noticed one thing: prices vary — a lot. Some companies promise super-cheap installs, while others talk about long-term value and premium systems. So how much should you actually expect to spend in 2025, and what really drives the cost up or down?
The truth is, there’s no single price tag that fits every home. But once you understand the main factors that affect installation costs, it’s much easier to plan your budget — and avoid surprises.
Why Prices Can Vary So Much
Think of air conditioning like buying a car: you can choose a small, simple model or a high-tech luxury option. Both will get you from A to B, but the cost, comfort and efficiency are worlds apart.
Some of the biggest things that influence price are:
- Your home’s size and layout. A single bedroom might only need one indoor unit, while a large house may need multiple rooms cooled or heated.
- The type of system. Split, multi-split and ducted systems all come with different price ranges and installation complexity.
- Brand and efficiency. Premium brands like Mitsubishi or Daikin can cost a little more upfront, but usually last longer and run more efficiently — saving you money over time.
- Installation complexity. Easy-access walls and clear outdoor space mean simpler work (and lower costs). Difficult runs, tricky wiring or tight spaces can add labour hours.
When you call a company like INS Air Conditioning, we don’t just throw out a random figure — we look carefully at your space, your comfort goals and your energy efficiency needs to recommend the right system.
Typical Price Ranges in London (2025)
While every property is unique, here’s a realistic guide for homeowners planning air conditioning this year:
A single room (like a bedroom or home office) with a quality wall-mounted split system often starts from £1,500 – £2,500, fully installed.
A multi-room system for a flat or small house can range from £3,500 – £6,000, depending on how many indoor units are needed.
Larger homes or properties looking for a ducted system — hidden pipes, discreet vents — may see costs from £6,000 upwards, especially if installation is complex.
These figures cover equipment, installation and VAT but can still vary based on the factors above. That’s why a free survey is so important: it turns guesswork into a clear, fixed quote.
The Hidden Cost of Going Too Cheap
It can be tempting to pick the lowest quote you find online — especially when budgets are tight. But poorly installed systems often cost more in the long run. We regularly see issues such as:
- Incorrect pipework that causes leaks and poor performance
- Systems under- or over-sized for the space (leading to high bills or uncomfortable rooms)
- Noisy operation because installation wasn’t done carefully
- Shortened lifespan due to lack of proper commissioning
A quality installation may cost a bit more upfront, but it usually pays for itself in reliability, energy savings and peace of mind.
Why Autumn and Winter Are a Smart Time to Install
Most homeowners only think about air conditioning when the heat hits — but by then, installers across London are booked solid. Right now (autumn and winter), things are calmer. That means:
Faster installation dates without long waiting lists
More time to plan and ask questions
Competitive pricing — some companies offer off-season deals
If you know you’ll want cooling next summer, it’s smart to install before demand spikes.
Why London Homeowners Choose INS Air Conditioning
With over 25 years of experience and a reputation for honest, high-quality work, we’ve helped thousands of London homes stay cool in summer and cosy in winter. Our team is fully FGAS certified, works with top brands like Mitsubishi, Daikin, Panasonic and LG, and handles everything from design to installation to long-term servicing.
When you choose us, you’ll get:
- A free home survey and tailored quote — no hidden surprises
- Clear advice on the right system for your lifestyle and budget
- Professional installation designed for performance and efficiency
- Ongoing support to keep your system running perfectly for years
Thinking About Installing Air Conditioning This Year?
If you’re ready to make your home more comfortable — and want clear pricing with no guesswork — we’d love to help.
Call us today on 01895 540565
Email contact@ins-airconditioning.co.uk
We’ll book a free survey, explain your best options, and give you a detailed quote so you can make an informed decision.
Final Thoughts
Air conditioning installation doesn’t have to be confusing or unpredictable. By understanding what affects the cost — and choosing an experienced, trusted installer — you can enjoy the comfort you want at a fair price.
Autumn and winter are the perfect seasons to plan and install, so you’re ready for the first warm day next year. Talk to INS Air Conditioning now and take the guesswork out of keeping your home comfortable.









