The first cool mornings are back. Is it already time to turn the heating back on, or is it better to wait a few more days? In reality, there is no ideal date that suits every home: a recent, well-insulated apartment does not respond in the same way as an old house, which is often more sensitive to temperature fluctuations.
Between the last days of summer and the first cold spells, it is not always easy to know when to turn the heating back on. During this transition period, needs change throughout the day and from one room to another. There is therefore no need to heat the entire home continuously.
Electric radiators with weekly programming make this easier by automatically adjusting the temperature to suit your lifestyle.
What is the ideal date to turn the heating on in autumn?
There is no legal date requiring heating to be turned on in a home with individual heating. Contrary to popular belief, there is no obligation to wait for a specific date before turning your radiators back on.
In practice, the heating season generally begins around mid-October, when outdoor temperatures drop steadily. However, the calendar remains an indication only: a well-insulated home will retain more heat than a property exposed to heat loss.
It is better to rely on the indoor temperature rather than the calendar. If your home naturally stays around 19°C during the day, there is no need to turn all the appliances back on immediately.
Individual vs. central heating: which rules apply?
In a home equipped with individual heating, the occupant is free to decide when to turn their radiators on or off according to their needs and comfort. They can adjust the set temperature room by room to avoid unnecessary energy consumption.
In a building with central heating, switching it on generally depends on a co-ownership decision or the rules provided for by the shared installation. The usual period is often between October 15 and April 15, although these dates may vary depending on weather conditions.
The Construction and Housing Code* notably sets out requirements relating to the thermal comfort of buildings, but it does not establish a single national date for turning on the heating in all homes.
The weather rule: the impact of outdoor temperatures
The main indicator for knowing when to turn on the heating remains the trend in outdoor temperatures. A sustained drop is generally more representative than a brief cold spell lasting a few days.
It is often considered appropriate to gradually turn the heating back on when outdoor temperatures fall below 12 to 14°C for several consecutive days.
This approach helps avoid two common mistakes: turning the heating back on after a brief cold spell or, conversely, waiting too long and allowing the home to cool down.
What indoor temperature should you turn your radiators back on at?
The indoor temperature is the best guide for determining the ideal time to turn the heating back on. A home can retain a pleasant temperature for several weeks after the heating is switched off, particularly thanks to its insulation and the thermal inertia of its materials.
In practice, many households turn their heating back on too early after the first cold week of autumn. However, a temporary drop in temperature does not necessarily mean that the heating season has begun. Monitoring the indoor temperature over several days is often more relevant.
The 19°C rule recommended by ADEME
According to ADEME**, maintaining a temperature of 19°C in occupied living areas is a good compromise between comfort and energy consumption. This does not mean that every room should be heated to this temperature: a bedroom or hallway can remain cooler without affecting everyday comfort.
During the shoulder season, a dry-inertia electric radiator provides more stable heat than a conventional convector, improving comfort while limiting temperature fluctuations.
Humidity: a factor not to overlook for thermal comfort
In autumn, the feeling of cold does not depend solely on the temperature shown on the thermostat. Air that is too humid can intensify discomfort and make a home feel colder than it actually is.
Maintaining a good humidity level can therefore improve comfort while avoiding overheating. An air dehumidifier can be useful in rooms prone to humidity, such as a bathroom, laundry room, or poorly ventilated home. By reducing excess humidity, it helps create a healthier and more pleasant atmosphere every day.
Adjusting the temperature according to the rooms in the home
Not all rooms in the home have the same needs. A bedroom, bathroom, or living room does not require the same set temperature, particularly because of how long each room is occupied.
- Living areas: maintain a comfortable temperature when the home is occupied.
- Bedrooms: a cooler temperature generally promotes better sleep.
- Bathroom: a temporary increase in temperature is often more suitable than permanent heating.
- Infrequently used rooms: maintaining a minimum temperature prevents the home from becoming excessively cold.
Smart heating solutions now make it possible to go further thanks to weekly programming and a connected thermostat. Heating can therefore adapt to your lifestyle: automatically lowering the temperature when you are away, raising it before you return, or adjusting it room by room.
Comparison table: recommended temperatures and switch-on times by room
A living room occupied all day and a bedroom used only at night do not have the same needs. Adjusting the temperature room by room is one of the simplest ways to limit consumption without sacrificing comfort.
| Room in the home | Target temperature | Suggested switch-on threshold | Comfort & savings advice |
| Living areas (living room, sitting room) | 19 °C | Below 18 °C residual temperature | Program a lower temperature at night or when away. |
| Bedrooms | 16 °C to 17 °C | Below 16 °C residual temperature | Choose a suitable duvet to delay turning on the heating. |
| Bathroom | 21 °C when occupied / 17 °C the rest of the time | Only when in use | Choose a responsive towel radiator to heat on demand. |
| Kitchen / Hallways | 17 °C to 18 °C | Below 16 °C residual temperature | Take advantage of the heat generated by cooking. |
How can you delay turning on the heating without sacrificing comfort?
At the start of autumn, it is often possible to postpone fully turning the heating back on with a few simple steps. The aim is not to endure the coolness, but to use the resources already available in the home intelligently.
Make use of solar heat and reduce heat loss
Before turning on your radiators, a few habits can help naturally retain heat and limit heating needs:
- Open the shutters at the first rays of morning on the south- or east-facing side to benefit from free solar heat.
- Close shutters and thick curtains as soon as night falls to limit heat loss through the windows.
- Air out your home for 10 minutes a day to renew the air and remove ambient humidity. Drier air is easier to heat.
- Use draft excluders or seal openings prone to drafts to reduce heat loss.
These simple steps can sometimes provide several degrees more perceived comfort without increasing the radiators' set temperature.
Relying on the responsiveness of electric radiators with thermal inertia
When temperatures start to drop, an electric radiator with thermal inertia is a suitable solution for easing the transition between seasons. Unlike heating that operates solely on an on-or-off basis, it delivers more consistent heat thanks to its heating core.
Depending on the model, the heating core is based on dry thermal inertia technology or a heat-transfer fluid. In both cases, the aim remains the same: to deliver gentle, consistent heat, even between two heating cycles.
The performance of electric radiators is also governed by European requirements and specific certifications. The European ErP Eco-design directive*** sets energy-efficiency criteria for energy-related products, while the NF Électricité certification** attests to quality and performance criteria for certain electric heating appliances.
The Bestherm radiators equipped with smart control are particularly well suited to transitional periods. Thanks to a connected thermostat, weekly programming, presence detection or window-opening detection, it becomes possible to automatically adjust the heating according to lifestyle habits.
During the first weeks of autumn, this zone-based approach notably avoids turning the heating back on throughout the home when only one room needs a temporary heat boost.
Essential steps before turning your radiators back on
After several months without use, a few checks will help you quickly restore efficient and comfortable heating.
- Dust the heating elements and ventilation grilles to prevent odors during the first use and optimize heat distribution.
- Check the settings and thermostats to make sure they match the new autumn schedules. A set temperature suited to the times when the rooms are occupied helps avoid unnecessary consumption.
- Carry out a gradual temperature increase test, room by room, to check that the appliances are working properly before the first severe cold spells.
Starting the heating early in a controlled manner also helps detect any maintenance needs or adjustments quickly.
FAQ: When should you turn on the heating?
What is the official date for turning on the heating?
There is no official date requiring individual heating to be turned on. In practice, the heating season often begins around mid-October. In buildings with shared heating, the start-up is decided by the condominium association, generally based on the weather.
If your home remains pleasantly warm despite the first cool spells, there is no need to turn your radiators back on immediately. Conversely, when the indoor temperature becomes persistently uncomfortable, it is time to gradually resume heating.
Should you turn on the heating as soon as the temperature drops below 19°C?
Yes, it is advisable to turn the heating back on when the temperature remains below 19°C in living areas. If the drop is temporary, it is better to wait or wear warmer clothing before turning all the radiators back on.
The perceived comfort also depends on several factors: indoor humidity, the quality of the insulation, the home's exposure, and the presence of drafts. A well-ventilated home with controlled humidity will maintain a comfortable feeling more easily.
Is it more economical to leave the heating on low or turn it off completely before winter?
At the beginning of the shoulder season, it is generally more economical to turn off the heating on mild days or use Eco mode. However, allowing a home to cool down completely can require more energy to bring it back up to temperature than maintaining it at around 16 to 17°C.
Connected electric radiators or models with weekly programming make this easier by automatically adjusting the temperature according to your lifestyle.
How can you heat the bathroom quickly without turning on the heating throughout the house?
To heat a bathroom quickly without raising the temperature throughout the house, a programmable electric towel radiator is one of the most suitable solutions. It allows the temperature to reach around 21°C only for as long as necessary, without turning the heating back on throughout the home.
A fan-assisted electric towel radiator with programming lets you anticipate the temperature rise before a shower and avoid heating the room unnecessarily for the rest of the day.
Conclusion: finding the right time to turn on your heating
Knowing when to turn on the heating does not depend solely on a specific date. The best indicator remains the balance between outdoor temperature, indoor temperature and the occupants' perceived comfort.
With an electric inertia radiator, a well-adjusted thermostat, good humidity management and programming suited to your lifestyle, it is possible to maintain excellent comfort while limiting your electricity consumption. By monitoring the temperature in your home and gradually adjusting the heating, you avoid heating unnecessarily while still enjoying a pleasant interior.
*https://www.legifrance.gouv.fr/codes/section_lc/LEGITEXT000006074096/LEGISCTA000041569808/2026-03-12
**https://agirpourlatransition.ademe.fr/particuliers/amenager-maison/chauffer/bons-gestes-chauffage-plus-economique
***https://www.ecologie.gouv.fr/politiques-publiques/ecoconception-etiquetage-produits-lies-energie
****https://marque-nf.com/categories/equipements-electriques-et-electroniques/nf-electricite-electricite-performance-nf089/
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