The first properly cold week of the year always seems to turn up before you’re ready. You get in after dark, let your bag drop in the hall, and the same hope flashes through your mind: Please let it be warm in here.
Almost without thinking, you nudge the thermostat up by a couple of degrees - part routine, part mild panic. The radiators click and groan into life. The gas meter starts whirring.
Then the email arrives. You open the bill and scroll, slightly stunned. It’s the same house and the same rooms, yet it feels as though your money is simply bleeding into the walls. Suddenly you’re pricing up new windows, better insulation, maybe even a replacement boiler.
But the most effective fix may already be sitting quietly where it always has - right in front of you, disguised as a single small number.
The one-degree trick that quietly slashes your bill
Plenty of us use the thermostat like a comfort dial: chilly, turn it up; too warm, turn it down. It’s mostly reflex, not a plan.
Yet that number on the display influences your energy spend more than almost anything else indoors. More than smart lighting. More than draught excluders. Your chosen set temperature effectively leads the entire heating system.
Drop it by just 1°C and, according to energy advisers across the UK, you can reduce heating costs by roughly 5–10%. No tools, no new gadgets, no hours up a ladder - just one subtle change nobody notices, but your bank balance definitely does.
Imagine two neighbours in a typical British semi: same gas boiler, similar insulation, and the same front door that never quite seals properly.
One keeps the thermostat at 22°C “because I hate being cold”. The other sticks to 20°C and pulls on a jumper in the evening. Come spring, they compare winter bills over a cup of tea.
The neighbour living at 20°C ends up paying tens - and sometimes hundreds - of pounds less while feeling nearly as comfortable. There’s no fancy upgrade involved. No new boiler. No triple glazing. Just that tiny, consistent number on the wall.
The reasoning is straightforward. Your boiler uses energy to raise the indoor temperature from whatever it is outside to the temperature you’ve selected - and then it has to keep working to hold it there.
Set the line higher and the system has a tougher job. Each extra degree usually means longer running times and more frequent firing, while heat escapes faster through walls, the roof and windows.
So if you go from, say, 21°C down to 20°C, you’re not merely accepting “a bit colder”. You’re cutting the amount of heat your home loses all day, every day. Across an entire winter, that small shift can add up to real savings.
How to change one setting and not freeze doing it
The most reliable approach is also the least dramatic: choose your usual comfortable temperature, lower it by 1°C, and keep it there for at least a week.
If you normally sit at 22°C, try 21°C. If you’re usually on 21°C, move to 20°C. The key is not to yo-yo the setting every few hours - give both your body and your home time to settle.
Within a few days, many people barely register the change. Add thick socks, a warmer layer, or a blanket on the sofa, and 21°C quickly starts to feel like “normal” again. That’s when the saving begins to quietly compound.
Where people often lose money is with the panic tweak. You come in after a bitter commute, you’re exhausted, your hands are numb, and you stab the thermostat up to 24°C “just to warm the place quickly”.
But setting a higher number doesn’t make the boiler heat the house faster - it just makes it run for longer and often go beyond the comfort level you actually need. The room becomes stuffy, you crack a window, and warmth (and cash) goes straight outside.
On a bad day you then swing the setting back down, feel cold again, and repeat the cycle. Let’s be honest: nobody really does that every day for fun - it’s just life getting in the way. But it quietly wrecks your energy bill.
Energy coaches visiting homes around the UK tend to repeat the same point:
“If you only change one thing this winter, make it your thermostat set point. One degree sounds tiny, until you see the bill at the end of the year.”
If you want a simple framework, treat your thermostat like a budget lever you can genuinely control:
- Choose a target temperature (19–21°C suits most living rooms).
- Reduce it by 1°C and keep it steady for a full week.
- Use extra layers, blankets and hot drinks as your “top-up” - not the thermostat.
- Keep bedrooms cooler (17–18°C is enough for sleep for most people).
- Resist the instinct to “blast it to 25°C” when you walk in cold.
It won’t earn you compliments at work, and it won’t make for exciting social media content. Still, over one winter it can release a surprisingly meaningful amount of money.
Living with a slightly cooler home – and a warmer bank account
After you’ve lowered the thermostat and stayed consistent for a while, a slightly odd moment tends to arrive. One evening you notice you’re completely comfortable at a temperature that used to feel “too cold”.
Your body has adapted without fuss, and your idea of “normal” has shifted just enough. The space still feels like home - not like you’re conducting an energy-saving trial.
That’s when the one-degree approach stops feeling like going without and starts feeling like a small act of defiance against rising bills. You haven’t overhauled your life; you’ve simply adjusted the number running quietly in the background.
| Key point | Detail | Why it matters to you |
|---|---|---|
| Lower by 1°C | Reduce the thermostat by a single degree compared with your usual setting | Potential savings of 5–10% on your heating bill |
| Consistency | Hold a steady temperature instead of constantly changing it | More stable comfort and more controlled consumption |
| “Buffer” habits | Rely on extra clothing layers, throws and hot drinks | Less dependence on heating and a stronger sense of control |
FAQ:
- Is lowering my thermostat by 1°C really worth it? Yes. For many UK homes, that single degree can trim around 5–10% off the heating portion of your bill over a full winter.
- Won’t my house feel freezing if I go from 21°C to 20°C? You might notice it for a day or two, then your body usually adapts. Warm socks, a jumper and a throw on the sofa often bridge the gap easily.
- Is it better to turn the heating off when I go out? For short trips, keeping a lower, steady temperature is often more efficient than letting the house get icy cold and reheating from scratch.
- What temperature should I use at night? Most experts suggest around 17–18°C for bedrooms. Many people sleep better slightly cooler, under a proper duvet.
- Do I need a smart thermostat for this to work? No. A simple manual thermostat is enough. Smart models just make it easier to schedule and track what you’re actually using.
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