Across Europe, regulators, doctors and energy specialists are rethinking the famous “19‑degree rule”. The focus is shifting from blanket austerity to more nuanced guidance that tries to keep people healthy, bills manageable and emissions on a downward path at the same time.
The old 19 °c rule faces a reality check
For years, 19 °C was held up as the virtuous target for home heating. The idea was simple: keep thermostats low, save gas or electricity, and cut carbon emissions. That message became particularly strong in the middle of the energy crisis, when governments urged households to turn down the heat.
The context for winter 2025 looks different. Wholesale energy prices have eased, even if bills remain high for many families, and weather agencies warn of a colder‑than‑average season in parts of Europe. Public health experts are also voicing concern about the impact of chilly homes on older adults, children and people with chronic illness.
Across new guidance, one message stands out: rigidly sticking to 19 °C no longer suits everyone, or every room.
Doctors point out that people with cardiovascular or respiratory problems can react badly to cold, damp interiors. Ageing bodies regulate temperature less efficiently. Young children lose heat more quickly. For these groups, living at 19 °C all day can mean shivering, fatigue and an increased risk of infections.
The new ideal temperature band for winter 2025
Energy agencies and building specialists now tend to recommend a slightly warmer range for the main living areas of a home.
The emerging consensus: aim for around 20–21 °C in living spaces, with slightly cooler bedrooms and warmer bathrooms when in use.
Room‑by‑room guidance
Rather than one temperature for the whole property, experts suggest adapting the setting to how each room is used:
- 20–21 °C in the living room and dining area, where people sit still for long periods and spend evenings.
- 18 °C in bedrooms, which supports better sleep for most adults while limiting energy use.
- Up to 22 °C in the bathroom during showers or baths, to avoid stepping out of hot water into cold air.
- Around 16 °C in less‑used or unoccupied rooms, to prevent damp and mould without wasting heat.
This approach tries to balance comfort, health risks and the reality of high energy prices. A one‑degree change may seem minor, yet people often feel a marked difference between 19 °C and 21 °C when sitting still for hours.
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Why experts worry about temperature shocks
One reason for these new ranges is the risk of sudden temperature changes. Moving from a very cold hallway to an overheated bathroom, for example, can strain the cardiovascular system, particularly for older people.
Maintaining a sensible gradient between rooms limits these “thermal shocks”. It also reduces condensation, which can trigger mould growth on cold walls and worsen asthma or allergies.
Heating slightly more, but more evenly and thoughtfully, often protects both health and the building itself.
How to warm your home intelligently without blowing the budget
The new guidance is not a call to crank the thermostat up all day. The emphasis is on control and timing rather than constant high temperatures.
Fine‑tuning the thermostat
Energy advisers repeatedly highlight one simple rule: every extra degree on the thermostat can raise heating costs by roughly 7–10%, depending on the system and insulation. That makes careful adjustment worthwhile.
- Use programmable thermostats or smart valves to lower temperatures at night and when nobody is home, then warm rooms shortly before you return.
- Close shutters or curtains at night to cut heat loss through windows, particularly in older properties with single glazing.
- Ventilate briefly each day by opening windows wide for five to ten minutes, which refreshes the air without cooling the building fabric too much.
- Service boilers and radiators regularly so they run at their designed efficiency, and bleed radiators that feel cold at the top.
- Add thermal curtains or draught excluders around windows and doors to reduce cold spots near glass and gaps.
These small adjustments often have a cumulative effect. A home heated to 20 °C but well insulated, with no cold draughts, usually feels more comfortable than a leaky home at 22 °C.
Health, comfort and costs: what really changes at 1 °c?
Debates about recommended temperatures can sound abstract, yet a single degree makes a measurable difference. Studies in building physics show that raising the average temperature from 19 °C to 20 °C typically increases heating demand by around 5–7% in a moderately insulated home.
For a household spending £1,200 a year on heating, that might mean £60–£80 extra over a full winter. Moving from 19 °C to 21 °C roughly doubles that impact. The trade‑off is that frail or sedentary people often feel less cold stress at these levels, avoiding more serious health costs later on.
Policymakers now talk less about one “good” number and more about a comfort band matched to people’s age, health and building quality.
Energy poverty campaigners urge governments to keep supporting lower‑income households so they can safely reach at least the 18–20 °C range. Prolonged exposure to indoor temperatures below 18 °C is linked with higher rates of respiratory illness and excess winter deaths.
Practical scenarios for a typical winter day
A weekday in a family flat
Imagine a family living in a medium‑sized flat with gas heating:
- 06:30–08:30 – The system raises the living area to 20–21 °C, bathroom to 22 °C during showers, bedrooms around 18 °C.
- 08:30–17:00 – Everyone is out. Heating drops to 16–17 °C to protect the building and pipes.
- 17:00–22:30 – Living areas return to 20–21 °C for homework and TV. Bedrooms stay close to 18 °C.
- Night – Thermostat set to about 16–17 °C across the home.
This pattern keeps comfort high when people are present, while limiting waste at other times. Smart thermostats can learn these habits and fine‑tune them further, sometimes sending alerts if a window has been left open or if usage suddenly spikes.
Older adults staying at home all day
The picture changes for retirees or people working from home who spend long hours indoors. In that case, advisers often suggest keeping main rooms nearer the top of the 20–21 °C band during the day, while still using zoning: less in unused rooms, more where they actually sit.
Warm clothing layers, blankets and hot drinks still play a role, but relying solely on piling on jumpers in a 17 °C room is no longer seen as a safe public health strategy for the most vulnerable.
Key terms worth understanding
Thermal comfort
Thermal comfort describes how people actually feel in a space, not just the number on the thermostat. Air temperature, humidity, air movement, clothing and activity level all matter. Someone working at a computer in light clothing will feel cold at a temperature that feels fine to someone cleaning or cooking.
Thermal inertia
Thermal inertia refers to how slowly a building heats up and cools down. Solid stone or brick homes may take hours to change temperature, while lightweight constructions can feel cold within minutes when heating is turned off. Knowing your home’s behaviour helps you decide whether to keep a steady 20 °C or rely on short bursts of higher heat.
Looking beyond the thermostat
The debate around winter 2025’s “ideal” temperature is gradually moving from slogans to nuance. Insulation upgrades, double glazing, heat pumps and better controls can all shift the equation, allowing homes to feel comfortable at the lower end of the 20–21 °C range.
For now, the core message is simple: aim for slightly warmer living areas than the old 19 °C rule suggested, keep bedrooms comfortably cool, and manage your heating with timing and zoning rather than blunt, continuous heat. The right number on the dial depends not just on the weather forecast, but on who lives behind the front door.
Originally posted 2026-03-06 03:04:19.