Apr 12, 2026
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Turning off or reducing heating at night: the mistakes not to make to save money

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In winter, maintaining a pleasant temperature in your home is essential. However, turning off or reducing your heating at night may seem like an ideal solution to save energy and decrease your bill. But is it always effective? Let’s discover the mistakes to avoid to optimize your savings without compromising your comfort.

With recommendations from Ademe and the evolution of heating technologies, it is crucial to understand how to adjust your system to maximize benefits while minimizing costs.

Understanding Ademe's recommendations on nighttime temperature

The Agency for Ecological Transition (Ademe) suggests maintaining a temperature of 19 °C during the day and lowering it to 16 or 17 °C at night. This drop promotes quality sleep while reducing energy consumption. With this approach, you enjoy an environment conducive to rest while saving on your heating bill.

However, it is important not to apply this recommendation uniformly. The nature of your heating system plays a crucial role in the effectiveness of this strategy. Let’s explore the different types of heating and their impact on your nighttime savings.

Why nighttime temperature influences your bill

Managing the temperature at night can significantly affect your energy consumption. A lower temperature reduces heating demand, but the type of heating you use can reverse this effect. Understanding this mechanism is essential to avoid costly mistakes.

Type of heating

Impact of nighttime reduction

Recommendation

Oil or gas boiler

Increased consumption during restart

Avoid turning off heating completely

Electric radiators

Minimal consumption drop

Effective nighttime reduction

Cast iron radiators

High inertia, high consumption at restart

Maintain a low temperature

Underfloor heating

High consumption to raise temperature

Use advanced timers

Impact of heating types on energy savings

The type of heating system you have determines the best strategy to optimize your nighttime savings. Here’s how different systems react to a drop in temperature at night.

Oil and gas boilers: caution and strategy

Boilers using oil or gas, such as Saunier Duval or De Dietrich, have a high energy consumption during startup. Turning off these systems completely at night can lead to an increase in the bill, as restarting requires a lot of energy. It’s better to simply lower the temperature rather than turn it off entirely.

To optimize, consider using programmable thermostats or smart solutions that automatically adjust the temperature based on your needs.

Low inertia systems: guaranteed savings

Electric radiators and convectors, such as those offered by Thermor or Atlantic, easily adapt to temporary drops in temperature. Their low inertia allows them to quickly raise the temperature without excessively consuming energy. Thus, a nighttime reduction is not only possible but recommended for these systems.

  • Installation of ambient thermostats

  • Using time programmers

  • Effective insulation of rooms

These measures help maintain optimal comfort while maximizing energy savings.

High inertia systems: precise management is essential

Cast iron radiators and underfloor heating, used by brands like Viessmann or Chaffoteaux, have high thermal inertia. This means they retain heat for a long time but require a lot of energy to raise the temperature once it has been reduced. Turning off these systems at night can therefore lead to increased overall consumption.

For these types of systems, it is recommended to maintain a constant low temperature rather than turning them off completely. Using smart controllers can help effectively manage this balance.

Tips for reducing heating consumption at night

To maximize your savings while maintaining optimal comfort, here are some effective strategies to adopt at night.

Setting the temperature effectively

To avoid energy waste, it is crucial to find the right temperature balance. Adopting Ademe's recommendations while considering your specific needs is a good start. For example, Ferroli and Buderus offer programmable thermostats that allow automatic temperature adjustments based on the time.

  • Program the temperature drop an hour before bed

  • Slightly increase the temperature before waking up

  • Use independent heating zones

Using smart programmers and thermostats

Modern technologies, such as smart thermostats from Edilkamin, allow optimal management of your heating. These devices automatically adjust the temperature according to your lifestyle habits, thus reducing consumption without compromising your comfort.

Brand

Features

Advantages

Thermor

Time programming, remote control

Flexibility and savings

Viessmann

Learning habits, IoT integration

Automatic optimization

De Dietrich

User-friendly interface, energy alerts

Ease of use

Insulation and other energy efficiency measures

Good insulation is key to maintaining a stable temperature and reducing heating needs. Investing in quality insulation materials from brands like Auer or Chaffoteaux can significantly improve your home’s energy efficiency.

Here are some additional actions to consider:

  • Install thick curtains to minimize heat loss

  • Ensure optimal sealing of windows and doors

  • Use rugs to insulate floors

Advantages and disadvantages of lowering heating at night

Reducing the temperature at night has notable advantages but also carries some disadvantages that are important to consider.

Benefits for sleep and health

A cooler temperature at night promotes restorative sleep. Sleeping in an overly warm environment can disrupt sleep cycles, leading to increased fatigue and reduced concentration. Studies show that a temperature between 16 and 19 °C is ideal for quality sleep.

Furthermore, a stable temperature reduces the risk of respiratory issues and improves overall well-being. Brands like Saunier Duval offer adjustable heating systems that help maintain these optimal conditions.

Financial risks and increased bills

Counteracting the apparent benefits of nighttime reduction with certain heating systems can paradoxically increase energy costs. As mentioned earlier, oil or gas boilers and high inertia systems require more energy to restart, which can negate the savings made during the temperature drop.

It is essential to evaluate your heating system well before deciding to reduce or turn off heating at night. For more information, check out this article on optimal settings.

Case studies and concrete examples

Let’s analyze some practical examples to illustrate the impact of reducing nighttime heating according to the type of system used.

Example of a house with Saunier Duval

In a house equipped with a Saunier Duval boiler, the nighttime temperature reduction initially seemed promising. However, the restart costs ultimately offset the expected savings. By simply adjusting the temperature rather than turning it off completely, the household was able to reduce its consumption by 10% without additional costs.

This experience highlights the importance of choosing the right strategy based on your heating system.

Comparison between De Dietrich and Viessmann

Another case involves households equipped with De Dietrich and Viessmann boilers. Those who opted for a temperature reduction with these high inertia systems saw a slight decrease in their bills, but also an improvement in the longevity of the equipment due to more moderate use.

Conversely, those who turned off their heating completely noted an increase in energy costs during morning restarts, confirming the importance of not turning off heating completely for these types of systems.

Tools and technologies to optimize heating

Technological advancements offer numerous solutions for effectively managing the heating of your home. Using the right tools can make a huge difference in your energy savings.

Thermor and modern solutions

Thermor offers a range of smart thermostats that allow precise temperature management, tailored to your daily habits. These devices can be programmed to automatically adjust the temperature, thus avoiding unnecessary fluctuations that can increase energy consumption.

Product

Features

Advantages

Thermor Smart Thermostat

Remote control, advanced programming

Energy savings, increased comfort

Thermor Eco Mode

Automatic optimization, learning habits

Cost reduction, ease of use

Edilkamin and ecological alternatives

Edilkamin offers alternative heating solutions such as wood stoves and ecological inserts. These systems can be used to reduce dependence on central heating, particularly during nights when a lower temperature is acceptable.

These alternatives not only reduce energy consumption but also add an aesthetic and warm touch to your interior.

Other innovative brands: Atlantic, Chaffoteaux and more

Brands like Atlantic, Chaffoteaux, Ferroli, Buderus, and Auer also offer various solutions to optimize your heating. Whether through more efficient boilers, programmable radiators, or integrated systems, these companies provide options suitable for all types of housing and needs.

  • Atlantic: Multifunction heating systems

  • Chaffoteaux: Innovations in ecological boilers

  • Ferroli: Economic solutions for various households

FAQ

Is it really economical to reduce heating at night?

Yes, but it depends on the type of heating you use. Low inertia systems like electric radiators benefit greatly from nighttime reduction, while oil or gas boilers may see their savings offset by increased consumption during restart.

What temperature is recommended at night to save?

Ademe recommends lowering the temperature to 16 or 17 °C at night, which promotes restorative sleep while reducing energy consumption.

What tools can help me optimize my heating?

Using programmable and smart thermostats, like those offered by Thermor or De Dietrich, as well as improving your home’s insulation, are effective ways to optimize your heating and achieve savings.

Should I turn off my heating completely at night?

It is generally better to reduce the temperature rather than turn the heating off completely, especially if you are using a high inertia system or an oil/gas boiler. This helps avoid high costs associated with restarting the system.

What are the advantages of a smart heating system?

Smart heating systems offer precise temperature management, reduced energy costs, and increased comfort through programming adapted to your lifestyle habits. They also allow remote monitoring and automatic adjustments according to needs.

To deepen your knowledge and discover other tips, feel free to check out this article and these tips.