Portable Air Con vs Whole Home Cooling: Which Makes Sense in the UK?

Study Time: 5 minutes

Not so long ago, buying an air conditioner in Britain would have seemed unnecessary. A fan, an open window and a few days of complaining usually sees us through the hottest season of the year.

But summer is changing.

The UK has now recorded temperatures of over 40°C, while the Met Office says climate change is making heatwaves hotter, more intense and more common. The Committee on Climate Change has also warned that millions of UK homes are at increased risk of overheating as average temperatures continue to rise.

That leaves many homeowners asking the same question: Is air conditioning finally becoming a sensible investment instead of an expensive luxury?

The answer depends on how hot your home is, how often you expect to use it and whether you’re considering a portable unit or the type of whole-house cooling that’s common in countries like the US and Australia.

Why air conditioning is becoming a serious discussion in Britain

British houses are built to keep heat in, not let it out.

That works well for most of the year, but during long periods of hot weather it means that bedrooms, loft conversions and south-facing living rooms can get uncomfortably warm for days on end.

The problem is not just comfort. High indoor temperatures can affect sleep, concentration and health, especially for the elderly, children and anyone with heart or respiratory conditions.

Although no one expects that Britain will need the level of cooling seen in Florida or Queensland, many experts now believe that some form of home cooling will become more common as summers continue to warm.

Portable air conditioning: the cheapest way to stay cool

For most homes, a portable air conditioner is an obvious start.

Unlike installed systems, they do not require professional installation. Simply move the unit into the room, plug it into a standard socket and exhaust the hot air through a nearby window using the hose provided.

Prices have come down significantly over the past few years, with decent models now starting from around £250.

They are not perfect. Portable units are noisy, heavy and only cool one room. They also need the exhaust pipe to be properly sealed to the window otherwise too much cool air just escapes.

How much does portable air conditioning cost?

This is a question that many buyers ignore.

Using Ofgem’s current electricity price cap as a guide, a portable air conditioner costs around 20p and just over 50p an hour running depending on its size.

Even during a week-long heatwave, most families spent somewhere between £10 and £20 using a portable heater for a few hours each day. That’s more than a fan, but a lot less than most people expect.

Which portable air conditioners get the best reviews?

After comparing expert reviews from Where?, T3, Ideal Home and The Independent, three names always stand out…

One thing reviewers universally agree on is that expectations matter. Even the best portable air conditioner won’t cool the whole house, but it can make a big difference in a bedroom, home office or living room if the doors are kept closed.

What if you want the right air conditioning throughout your home?

This is where the cost increases significantly.

Wall-mounted air conditioning systems common in America, Australia and southern Europe are more efficient than portable units because the noisy compressor sits outside the house. The rooms are quiet, cool quickly and usually cost less to run per room.

However, professional input is essential.

The fully fitted systems used in many American and Australian homes are now rare in Britain because our homes were not designed around them. Re-plumbing in an existing building often means raising the floor, lowering the ceiling or punching in the plumbing, making installation expensive and inconvenient.

For that reason, many UK installers recommend installing a split system only in the hottest rooms – usually the master bedroom and living room – rather than trying to cool the whole house.

Will air conditioning add value to your home?

It may not be enough to cover the installation costs yourself.

Unlike in tropical countries, UK consumers generally do not expect air conditioning. However, real estate agents are increasingly reporting that cooling can be an attractive selling point for modern homes, luxury homes, high-rise conversions and properties that suffer badly from overheating.

Modern split systems also have another advantage: many air-to-air heat pumps double as one, providing cooling in the summer and economical heating during the cooler months.

So…is the last gasp worth it?

Five years ago the answer for most families would probably have been “no”.

Today it is not so clear.

If your bedroom regularly reaches 28°C or more in the summer, struggles to cool down at night and leaves you tired the next day, spending £300 to £500 on a portable air conditioning unit can really improve your quality of life.

If you own your home and anticipate the growing summer heat, a properly installed split system may offer better long-term value because it is quieter, more efficient and more efficient than a portable unit.

Whole-house cooling, however, remains difficult to justify financially for many UK households unless you are already undertaking a refurbishment or building from scratch.