For decades, governments and energy agencies have repeated the same guideline: keep homes at 19°C to save energy. Yet better insulation, new heating tech and changing lifestyles mean that number now looks more like a historic compromise than a universal rule. A growing group of specialists argue that the real “sweet spot” for modern homes sits slightly higher.
The end of the 19°c dogma
The famous 19°C benchmark was born during the oil crises of the 1970s, when Europe scrambled to cut fuel consumption. The message was simple: lower the thermostat for the sake of national energy security.
Back then, housing stock was leaky. Single-glazed windows, poorly insulated walls and basic boilers meant heat vanished quickly. Comfort came second to scarcity. Holding 19°C indoors already required a lot of fuel.
Fast-forward half a century and the picture looks very different. New builds must meet strict thermal performance standards. Condensing boilers, heat pumps and smart thermostats have become mainstream. Working from home keeps more people indoors for longer stretches. Screens and sedentary work make many feel cold much faster than when they were moving around all day.
Today, 19°C is less a magic number and more a relic from a time when homes leaked heat and energy was cheap to waste.
Energy consultant Nick Barber describes 19°C as a “theoretical reference” that often clashes with what families actually need. Heating specialist Brad Roberson goes a step further: for most modern households, he says, the best balance between comfort and cost is closer to 20°C.
Why 20°c is becoming the new norm
Raising the thermostat by one degree might sound trivial, yet for many people that tiny adjustment transforms how a room feels. The key is proportionality: 20°C is still far from tropical, but it stops the shivers.
Comfort vs. cost: what 1°c really changes
Energy agencies usually estimate that each extra degree of heating above 19°C adds around 7% to your heating consumption. That makes the jump from 19°C to 20°C a modest increase, especially compared with homes kept at 22–23°C all winter.
- At 19°C, many people report needing extra layers while sitting still.
- At 20°C, discomfort during quiet activities like reading or working on a laptop drops sharply.
- At 22–23°C, energy use and bills rise steeply, with limited extra health benefit.
In practical terms, 20°C is emerging as a “comfort floor”: warm enough for everyday life, low enough to keep bills under control.
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Another crucial point: our perception of temperature is not only about the thermostat setting. Three main factors shape how warm or cold you feel at the same number of degrees.
- Insulation – A poorly insulated flat can feel chilly at 21°C, while a well-insulated home feels cosy at 19–20°C.
- Humidity – Damp air makes rooms feel colder; a slightly drier, well-ventilated home feels more comfortable at the same temperature.
- Activity level – Sitting still in video meetings is nothing like cooking, cleaning or DIY. The less you move, the more warmth you need.
Different rooms, different targets
Experts are increasingly shifting from “one temperature for the whole home” to a room-by-room strategy. You do not experience every space in the same way, so heating them all to 20°C can be a waste.
| Room | Recommended temperature | Reason |
|---|---|---|
| Living room / office | 20°C | Comfort for sedentary activities and social time |
| Bedrooms | 16–18°C | Cooler air promotes better sleep quality |
| Bathroom (when in use) | 22°C | Prevents cold stress when showering |
| Hallways / landings | Around 17°C | Transit spaces need less heating |
This staggered approach keeps the areas where you spend time comfortable, while trimming energy use in less critical rooms. It also recognises that thermal comfort is as much about how your space is organised as the number on the thermostat.
Simple habits that change your heating bill
Switching from 19°C to 20°C does not automatically mean a higher bill if you sharpen your heating habits at the same time. Some small changes can offset that extra degree, sometimes with room to spare.
- Use a programmable thermostat: set different temperatures for day, night and absences. Heating an empty home to 20°C all day costs more than a quick boost before you arrive.
- Improve insulation: draught-proofing, roof insulation and double glazing keep warm air indoors. Your heating runs less often to maintain 20°C.
- Let the sun work for you: open curtains on sunny winter days, then close them at dusk to trap heat.
- Shut doors: separating heated areas from cooler zones prevents warmth from escaping to unused rooms.
- Add rugs and textiles: carpets and thick curtains cut cold radiation from floors and windows.
France’s environment agency ADEME estimates that well-chosen everyday actions can slice 10–15% off annual heating costs.
When “cold saving” becomes risky
With energy prices rising, some households push the thermostat below 19°C to cut costs. Doctors warn that this can quietly backfire on health, especially for older people, babies and those with chronic conditions.
- Respiratory infections: colder indoor air makes lungs work harder and supports viruses and bacteria.
- Poor sleep: while slightly cool bedrooms are helpful, very cold environments can trigger micro-awakenings and restless nights.
- Cardiovascular strain: the body narrows blood vessels to hold on to heat, adding workload for the heart.
The World Health Organization suggests a minimum of 18°C in living spaces, with a higher threshold for people who are elderly, ill or very young.
Below 18°C for long periods, the health risks often outweigh the money saved on fuel.
A new way of thinking about home energy
The debate around “the right temperature” is really a debate about how we live in an age of climate stress and volatile energy prices. Heating is no longer a background detail; it sits at the crossroads of carbon emissions, public health and household budgets.
Heat pumps, solar panels and government-backed retrofit schemes are changing how homes are powered. At the same time, many people are recalibrating their comfort expectations, layering clothing more in winter and heating fewer rooms.
Within this shifting landscape, the old 19°C mantra still has value as an energy-awareness signal, but experts now treat it as a flexible baseline instead of a strict limit. A reference, not a rulebook. In most typical homes, 20°C in main living areas now looks like a reasonable target.
What “ideal temperature” really means for different people
There is also a strong personal dimension. A healthy adult who moves around often will tolerate cooler rooms better than someone who spends the day seated or has poor circulation. Infants and frail seniors feel the cold sooner and may need that extra degree or two to stay safe.
One useful approach is to treat 20°C as a starting point, then adjust slightly based on your situation:
- If you work from home at a desk all day, 20–21°C in your office may avoid constant layering.
- If you live in a compact, well-insulated flat, 19–20°C may feel perfectly warm.
- If you have respiratory or heart issues, your doctor may advise avoiding temperatures below 19°C for long periods.
Practical scenarios for this winter
Imagine a typical three-room flat with average insulation. The occupants set 20°C in the living room from 7am to 9am and from 5pm to 10pm, 17°C the rest of the time, 17–18°C in bedrooms at night, and no heating in the hallway. Coupled with decent draught-proofing and curtains, that pattern keeps the home comfortable while staying within reasonable consumption.
Now compare it with a neighbour who keeps the whole property at 22°C all day, including while at work. The second household will face a significantly higher bill, yet the difference in comfort level is often marginal once people are used to slightly cooler air and warmer clothing.
Terms are also worth clarifying. “Setpoint temperature” is what you choose on the thermostat. The “felt temperature” or “operative temperature” takes into account surfaces around you: cold walls, windows or floors can make 20°C feel like 18°C. That is why insulation and rugs can feel almost as effective as turning the heating up.
The real game changer is not a single number on the dial, but how your home holds, distributes and uses heat across rooms and time.
For many households this winter, the most realistic goal will be simple: aim for around 20°C in the main living areas, keep bedrooms cooler, protect vulnerable people from cold snaps, and pair that strategy with smarter habits and gradual home improvements. The old 19°C slogan fades, but the bigger idea stays: heat thoughtfully, not automatically.
