Why the 19 °C Rule Is Obsolete: 20 °C May Be Better at Home

The year’s first cold spell reliably sparks the same small household battle. One person quietly turns the thermostat up “just a notch”, while the other slips in later to turn it back down, grumbling about the energy bill. In plenty of homes, an old saying still lingers as though it were a family commandment: “Set it to 19 °C, that’s the norm.” Few people can say where it originated, yet it is repeated almost magically, as if 19 °C were printed on everyone’s birth certificate.

But speak to people and it becomes clear that very few are truly comfortable at that setting. They reach for another jumper, make one more cup of tea, or sit beside a small fan heater every evening. Clearly, something is not quite right.

Why the 19 °C rule no longer reflects real life

For years, the well-known 19 °C recommendation was presented almost as a civic obligation. Public campaigns promoted it on television, in workplaces and even at schools. Set the dial to 19, be responsible, protect the planet and save money. Yet in real homes during winter, thermostats are often discreetly set to 20, 21 or even 22 °C.

The divide between that rule and daily reality is now too obvious to overlook. People feel colder, housing has changed, and our routines bear little resemblance to those of the 1980s.

Consider Laura and Marc, who live in a modern flat with large bay windows. Last winter, they attempted to “follow the rule”: thermostat at 19 °C, an extra jumper and thick socks. Within two weeks, they had abandoned the idea. Their toddler’s hands were constantly cold, a narrow chill seeped in around the windows, and sitting on the sofa in the evening felt more like camping than unwinding at home.

They began raising the temperature gradually: first to 19.5, then 20, eventually settling on 20.5 °C in the living room and 18.5 °C in the bedrooms. Their heating bill did not spiral out of control, while the mood at home became noticeably more comfortable. They were not champions of energy restraint, but neither were they shivering.

Building physics specialists increasingly acknowledge what many people already feel: 19 °C was a symbolic figure, not an answer for everyone. It was based on research involving relatively standard, well-insulated rooms and reasonably active adults. Today’s homes range from old stone cottages to heavily glazed lofts, while our lives have become far more sedentary. We can spend hours in front of screens with very little movement.

Applying one fixed temperature without thought no longer adds up. Genuine comfort depends on a combination of air temperature, humidity, insulation and the way our bodies actually occupy a space. At last, the discussion is beginning to shift.

The 19 °C to 21 °C comfort range experts now recommend

Across Europe, many health and energy professionals now favour a more considered approach. Instead of one untouchable figure, they refer to a comfort range. In living areas used for sitting, chatting, watching television or working from home, they generally advise between 19.5 °C and 21 °C, with around 20 °C suiting most people.

Bedrooms allow for a broader approach: 17 °C to 19 °C, depending on age, bedding and personal preference. The important change is that the aim is no longer to “hit 19” whatever the cost, but to identify the lowest temperature at which you actually feel well rather than merely virtuous.

Try a straightforward test over seven days. For days 1 and 2, set the living room to 19.5 °C. Use 20 °C on days 3 and 4, then 20.5 °C on days 5 and 6. Pay attention to your response: are you keeping your coat on, developing headaches, nodding off on the sofa or heading to the kettle every hour?

Most households that try this find their true comfort point sits just above or below the mythical 19 °C, sometimes by only 0.5 °C. Yet such a small shift can transform an entire evening. You may be more likely to read, talk or play with the children instead of wandering about in search of warmth. That is not extravagance; it is practical comfort.

Energy specialists make one point clearly: each extra degree has a financial cost, but forcing yourself to stay colder when you are already uncomfortable carries a cost too. You move less, your body tightens up and you may become ill more easily. That unseen expense will not appear on a gas bill, but it still exists.

This is where the “obsolete” nature of the 19 °C rule is most apparent. It came to be used as a moral measure: being too warm suggested irresponsibility, while being too cold implied virtue. The guidance is now more practical: target around 20 °C in living spaces, vary it slightly between rooms, and focus on insulation, draughts and sensible use rather than guilt. In truth, hardly anyone checks the precise temperature in every room, every day.

How to heat smarter without freezing or going broke

Current expert advice focuses less on a single number and more on everyday routines. One particularly effective measure is to separate daytime and night-time temperatures. Keep living areas near your personal comfort level during the day, often close to 20 °C. At night, or while you are out, reduce the setting by 2 to 3 degrees, particularly in rooms that are not being used.

Programmable thermostats and smart radiator valves can manage this automatically. You choose the timings, and the system warms the home gradually before you get up or return. The aim is not to turn the heating dial up and down every hour, but to create a predictable schedule that fits your actual routine.

Many frustrations stem from everyday errors that are easy to miss. These include curtains covering radiators, furniture restricting air circulation, windows left slightly open “to air out” for half the day, and the familiar fan heater running in one room all evening because the central heating is set too low.

Many people also feel guilty about not staying at 19 °C, so they compensate with hot showers, electric blankets and endless mugs of tea. Their bodies never properly settle. Rather than assessing yourself against an outdated rule, a healthier question is: at this temperature, while dressed normally, can I sit for two hours without becoming cold or sleepy? If not, you are entitled to adjust it. Comfort is not a moral failure.

Experts recommend a gradual, step-by-step approach rather than a dramatic overnight change.

“Forget the magic number,” says an energy consultant who audits homes all winter. “Find the range where your family actually lives, then work down gently over time by improving your home, not by punishing your body.”

• Aim for around 20 °C in main living areas and 17–19 °C in bedrooms.
• Reduce the setting by 2–3 °C overnight or when you are out, rather than keeping it lower throughout the day.
• Keep radiators unobstructed: do not place furniture in front of them or let long curtains hang over them.
• Ventilate properly for 5–10 minutes with windows fully open, then close them, rather than leaving them ajar.
• Prioritise draught-proofing and basic insulation before investing in replacement heating systems.

A different way to think about warmth at home

Once you move beyond the strict 19 °C rule, the question becomes different. Rather than asking, “Am I at the official number?”, ask whether your home helps your body feel comfortable while using less energy. It is a gentler, more personal and almost intimate way of looking at the issue.

Some people will be perfectly comfortable at 19.5 °C in a warm jumper and thick socks. Others may require 20.5 °C because they spend all day beside a poorly insulated window or have circulation problems. There is no single correct setting. The priority is to remain in a sensible comfort range, then steadily improve the home itself, daily habits and air leaks that can be sealed with foam strips or heavier curtains.

Beneath the thermostat arguments lies something more fundamental: our relationship with comfort, effort and guilt. The old rule was straightforward and, in some ways, convenient. However, it led people either to break it quietly or endure discomfort without saying anything. Today’s expert advice is less neat, more nuanced and closer to ordinary life. It encourages conversations at home: “What temperature do you really feel good at? Where do you feel cold drafts? Which room feels damp?”

That sort of discussion will never fit neatly into a government slogan. It belongs around the table in the evening, when somebody finally feels able to say: “You know what, I’m actually cold at 19.” From that point, change becomes possible. Perhaps you will test 20 °C for a week, buy a small thermometer or exchange advice with friends. You may even find that comfort and energy savings can coexist once guilt has left the room.

Key point	Detail	Value for the reader
New comfort range	Around 19.5–21 °C in living spaces, 17–19 °C in bedrooms	Helps set a realistic target, not a rigid rule
Smarter usage	Lower heating by 2–3 °C at night or when away, not all day	Reduces bills without sacrificing comfort
Home improvements first	Seal draughts, free radiators, manage curtains and airing	Cuts energy waste before spending on new systems

FAQ:

• Question 1 Is 19 °C completely wrong now?
• Answer 1 No, 19 °C is not “wrong”, it is simply not universal. It may suit some active adults in well-insulated homes, but many people are more comfortable slightly above it, at around 19.5–20 °C.
• Question 2 What indoor temperature do experts recommend today?
• Answer 2 Most specialists advise approximately 19.5–21 °C for living rooms and workspaces, and 17–19 °C for bedrooms, always taking account of age, health and insulation quality.
• Question 3 Does increasing by 1 °C really cost a lot more?
• Answer 3 Raising the thermostat by 1 °C can add around 7 to 10% to heating consumption, depending on the home. This is why it is worth finding the lowest temperature at which you still feel genuinely comfortable.
• Question 4 Should I heat all rooms to the same temperature?
• Answer 4 No, you can prioritise rooms. Keep living spaces warmer, bedrooms and corridors cooler, and storage rooms almost unheated, provided there is no danger of damp or frozen pipes.
• Question 5 Is it better to turn the heating off completely when I go out?
• Answer 5 For a short absence, lowering it by 2–3 °C is generally sufficient. For longer trips, you can reduce it further, but avoiding a complete freeze prevents the building from cooling too much, which would take extra energy to heat again.