How to optimize your thermal comfort with a good energy renovation program?

Thermal comfort in our homes has become a major concern. Indeed, a pleasant interior does not solely rely on an efficient heating system, but also involves good insulation of walls, windows, and appropriate management of humidity. In 2025, optimizing your thermal comfort therefore requires a thoughtful and well-structured energy renovation program. All of these works should be considered in a collaborative framework between you and experienced professionals, while you inform yourself about the financial assistance available. This article examines the various aspects of energy renovation to ensure your well-being at home.

Understanding thermal comfort

Thermal comfort can be seen as the state of well-being felt inside a habitat. This concept, although subjective, relies on several physical and psychological criteria. When you enter your home after a long day, the warmth that envelops you should reassure you. But what influences this feeling?

• Ambient temperature: The ideal temperature is between 19 and 20 °C, a sufficient warmth without excess.

• Humidity level: A humidity level between 45 and 60% is recommended for a healthy atmosphere.

• Air circulation: Ventilation plays a fundamental role, whether through a controlled mechanical ventilation system (CMV) or well-placed windows.

• Effectively insulate your building: Walls and windows are responsible for significant thermal losses.

The 6 parameters influencing thermal comfort

When assessing thermal comfort, it is crucial to consider certain factors:

• The human metabolism and physiological needs.

• The level of clothing, which constitutes a barrier between your body and temperature variations.

• The characteristics of the walls and surfaces of the house.

• The quality of indoor air, impacting your health and well-being.

• The movement of air, which can enhance or limit the sensation of warmth.

The importance of energy auditing before renovation

Before embarking on a renovation program, the first step is to conduct an energy audit. This diagnosis allows you to identify the weaknesses of your habitat in terms of thermal performance. It highlights heat losses, often caused by insufficient insulation of walls or attics.

In the context of this audit, several points must be taken into account:

• Condition of existing insulation.

• Condition of heating and ventilation systems.

• Analysis of thermal loss sources.

Since 2023, this audit has become mandatory for any sale of a housing classified F or G. This finding illustrates the urgency of renovating your habitat to offer compliant housing according to current standards.

The choice of works: insulation, heating, and ventilation

Once the audit is completed, you can establish an action plan tailored to your needs. Here are the priority works to consider for optimal thermal comfort:

Thermal insulation

The insulation of walls is essential to limit heat loss. Whether from the inside (ITI) or the outside (ITE), the choice of method will depend on the configuration of your home and your budget. The chosen insulation (like those from Saint-Gobain) will have a direct impact on your energy bill.

Heating system

The choice of a sustainable heating system is essential. Gas boilers are increasingly being replaced by heat pumps. Air/water heat pumps offer exceptional efficiency while reducing your carbon footprint. Working with companies like Engie or EDF can help you choose the best option for your home.

Ventilation

Investing in a high-performance ventilation system is also crucial. A controlled mechanical ventilation system (CMV) allows for air renewal while preserving heat, thereby contributing to a better comfort. The most modern models are designed to limit thermal losses.

Financial assistance for energy renovation

In 2025, there are several financial assistance programs that can lighten your out-of-pocket expenses for energy renovation work:

• MaPrimeRénov’: A State financial support that can go up to 90% of the cost of works depending on your income.

• CEE Premium: Accessible to all, allowing you to receive assistance depending on the type of work done.

• Eco-PTZ: A zero-interest loan for financing renovation, payable over 15 to 20 years.

• Reduced VAT at 5.5%: On energy improvement works.

To benefit from these aids, simply simulate on dedicated platforms or contact a professional such as Leroy Merlin or Vinci Energies, who will assist you in your procedures.

Simulations and quotes

Before undertaking any work, it is advisable to obtain several quotes and to carry out financing simulations. Various platforms will allow you to compare prices offered by qualified and certified artisans.

Sustainable solutions: materials and innovative technologies

In a quest for optimizing energy performance, the choice of materials plays a fundamental role. Companies like Rockwool or Fermacell offer effective and durable solutions, combining insulation and respect for the environment. Here are some materials to consider:

• Rock wool (Rockwool): An excellent thermal and acoustic insulator.

• Plant fiber-based plaster (Fermacell): For durable and ecological protection.

• Polystyrene insulating panels (Insulate with Saint-Gobain): Effective and lightweight.

• Double glazing (Velux): Reduces thermal losses from windows.

RTE and the energy future of housing

Energy management is constantly evolving, influencing renovation choices. The RTE (Electricity Transmission Network) plays a crucial role in distributing renewable energy, thus affecting your choices of energy systems.

Thanks to innovative technologies and better management of energy flows, your home can achieve optimal performance while contributing to current environmental challenges.

FAQ

What are the main eligibility criteria for renovation aid?

Eligibility for renovation aid depends on several criteria, including: the type of housing (primary or secondary residence), its age (at least 15 years old), and the completion of works by a certified professional.

How to choose a professional for my energy renovation?

It is essential to choose a certified RGE artisan to ensure the quality of the work and access to financial aid. Contact organizations like Leroy Merlin or Vinci Energies for recommendations.

What aids are cumulative for wall insulation works?

You can combine MaPrimeRénov', the CEE Premium, and the Eco-PTZ for your wall insulation works, significantly reducing your out-of-pocket expenses. Ensure you meet the conditions of each aid to avoid possible refusals.

Which materials should be favored for ecological insulation?

For environmentally friendly construction, opt for materials such as rock wool, hemp, or biosourced panels from Fermacell. These solutions offer good thermal performance while being ecological.

When should I conduct my energy audit?

If you are considering selling your property or carrying out renovations, it is advisable to conduct an energy audit as early as possible. For housing classified F or G, this audit has been mandatory since 2023.