Global Warming and the Future of Home Cooling

The evidence is now impossible to ignore. Global average temperatures have climbed by more than 1°C since pre-industrial times, glaciers and icebergs like the one pictured above are retreating year on year, and heatwaves that were once rare are becoming a regular feature of the summer. For all of us, that raises a very practical question: how do we keep our homes comfortable without making the problem worse?

A Warming World Means Hotter Homes

The UK is not immune to climate change. Recent summers have brought record-breaking temperatures, with the mercury pushing past 40°C for the first time in 2022. Homes that were designed to retain heat through cold winters now struggle to stay cool, and demand for air conditioning has grown rapidly as a result.

Power station cooling towers releasing emissions — More cooling means more electricity demand — and where that power comes from matters. (Analogue Kid, CC BY 2.5)

But there is a catch. The more we rely on inefficient cooling, the more electricity we consume — and if that electricity comes from fossil fuels, we end up adding to the very emissions that drive global warming. It becomes a vicious cycle: hotter weather drives more cooling, which drives more emissions, which drives hotter weather. Breaking that cycle means looking not just at how much energy our cooling uses, but at what is actually inside the systems we install.

The Hidden Climate Cost of Refrigerant Gases

Most conventional air conditioning relies on chemical refrigerant gases to move heat. These gases are remarkably effective at cooling, but many of them carry a serious environmental and safety price tag that often goes unmentioned.

Outdoor air conditioning condenser unit that relies on refrigerant gas — Conventional systems rely on chemical refrigerant gas circulating between indoor and outdoor units. (Shixart1985, CC BY 2.0)

Powerful greenhouse gases: Common refrigerants such as R410A and R32 have a Global Warming Potential hundreds to thousands of times greater than carbon dioxide. A relatively small leak can have the climate impact of driving a car for thousands of miles.
Leaks are not rare: Refrigerant can escape during installation, normal operation, servicing and end-of-life disposal. Every gram that leaks goes straight into the atmosphere.
Safety concerns: Older gases (CFCs and HCFCs) were so damaging to the ozone layer that they have been banned worldwide. Many of their replacements are mildly flammable, and some industrial refrigerants such as ammonia are outright toxic to breathe.
Tightening regulation: UK and EU F-Gas rules are progressively phasing down high-impact refrigerants, which means systems built around them face a shrinking, increasingly expensive supply over their lifetime.

None of this means air conditioning is the enemy — staying cool is a genuine health necessity in a warming climate. It simply means the medium we use to do the cooling deserves much closer attention.

Why Water Is a Safer, Greener Coolant

A drop of water, a clean and non-toxic coolant — Water is non-toxic, non-flammable and has virtually no global warming potential. (Roger McLassus, CC BY-SA 3.0)

This is where water-based cooling stands apart. Water is one of the best heat-transfer mediums on earth — far more effective than air — and unlike chemical refrigerants it is non-toxic, non-flammable, does not deplete the ozone layer and has a Global Warming Potential of essentially nothing. If a water pipe leaks, you get water, not a potent greenhouse gas.

In a water-cooled system, water does the heavy lifting of carrying heat around your home, while refrigerant is kept confined to a single compact, sealed condenser unit rather than being pumped through long pipe networks running throughout the property. The result is a smaller refrigerant charge, far fewer potential leak points, and a system that is inherently kinder to both your household and the planet.

Breaking the Cycle With Efficient Cooling

Choosing the right coolant is only part of the picture. The key to staying cool responsibly is overall efficiency — getting the most comfort out of every unit of energy. A few things make a real difference:

Energy-efficient systems: Modern inverter-driven and water-cooled systems use far less electricity than older units to deliver the same comfort.
Low-impact coolants: Favouring water-based heat transfer and low-GWP refrigerants dramatically reduces the climate footprint of a system over its lifetime.
Renewable electricity: Pairing cooling with solar panels or a green energy tariff cuts the carbon footprint of running it even further.
Smart controls: Zoning, timers and thermostats ensure you only cool the rooms you are using, when you are using them.

Cooling Responsibly

Global warming is a challenge we all share, and the way we cool our homes is part of the solution. By choosing efficient, well-designed systems that rely on water rather than large volumes of high-impact refrigerant gas, we can stay comfortable through ever-hotter summers without adding to the problem.

Want to find out how an efficient, low-carbon water-cooled system could work in your home? Contact us today for a free consultation.

Image credits: Header — iceberg near Sandersons Hope, Greenland (Kim Hansen, CC BY-SA 3.0). In-article images via Wikimedia Commons under the licences noted in each caption.