Is Global Warming Good for Heating Bills?

It’s an understandable question.
If winters are getting milder, surely that means we’ll need less heating – and lower bills as a result?

There’s some truth in that, but as with most things in energy and climate, it’s more complicated than it first appears.

Yes, but only sometimes

Warmer average temperatures do reduce heating demand in many buildings.
The UK’s heating degree days – a measure of how much warmth buildings need over a year – have fallen by roughly 15–20% since the 1980s. For a typical gas-heated property, that could mean annual savings of a few percent in energy use compared to historic baselines.

So yes, in a narrow sense, global warming has taken some of the edge off winter heating loads.

But it’s not that simple

Firstly, energy prices have risen far faster than heating demand has fallen. Even if you’re using a bit less gas, the cost per unit has increased dramatically.

Secondly, cooling loads are going the other way. As summers become hotter and longer, the need for air conditioning or mechanical cooling is rising – especially in offices, schools, and care environments that were never designed for it. The UK’s cooling demand is still small compared to heating, but it’s growing fast.

And thirdly, the weather itself is becoming more volatile. Milder winters don’t mean stable ones – cold snaps, prolonged wet periods, and wind droughts are becoming more common as climate patterns shift. That volatility is bad news for energy prices: it disrupts supply, increases demand spikes, and adds uncertainty to both gas and electricity markets.

Warmer averages may make headlines, but it’s the unpredictable extremes that keep bills high.

Buildings don’t automatically adapt

Even with milder winters, most buildings and heating systems were designed for older climate patterns – when cold weather was more severe and predictable.
As a result, systems are often oversized for typical modern conditions. When they operate under partial load – as they now do for much of the heating season – boilers and heat pumps can cycle on and off more frequently, never reaching optimal efficiency. Each start-up wastes energy through pre-purge, warm-up, and heat losses from short run times.

This kind of part-load inefficiency means that even if outdoor temperatures are higher, actual energy savings may be smaller than expected. Poor control settings, fixed-speed pumps, and legacy time schedules compound the issue.

The real opportunity isn’t in relying on a warmer climate, but in improving how buildings respond to it – through better controls, right-sized systems, and insulation that keeps heat where it’s needed.

A changing equation

So, is global warming good for heating bills?
Maybe for a few months each year – but across the system, not really.
The energy we save in winter is increasingly offset by what we spend in summer, and the volatility of energy prices outweighs any modest reduction in heating demand.

The real benefit lies in adapting our buildings to a changing climate – not assuming that climate change itself will make energy cheaper.

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