Let’s take a closer look at the importance of thermal inertia in old buildings and how it affects the setup and performance of the heating system. We will discuss options for making the most of this thermal inertia and improving comfort while reducing energy consumption.

Thermal Inertia Explained

Thermal inertia is the ability of a material to store and slowly release heat. In the case of old buildings with thick stone walls, thermal inertia has a clear advantage as it helps maintain a stable temperature indoors, despite the variations in outdoor temperature. This can also complicate precise control of your heating systems and contribute to heat loss if the insulation is not appropriate.

The Reality of Cast Iron Radiators

• Old cast iron radiators generally have a limited heat exchange surface, making them less efficient than modern models. As a result, you will need to send water at higher temperatures to achieve adequate heating.
• Given this constraint, it is advisable to adjust the water law of your heating system to work with appropriate parameters (base temperature and curve slope).
• If your building has been properly insulated, your radiators will likely be oversized, thus allowing you to use lower parameters.

Improving Comfort and Energy Efficiency Through Thermal Inertia

To fully leverage the thermal inertia of your building while reducing energy consumption, you can adopt the following strategies:

Temperature Settings

• Set the lowest possible target temperature while maintaining an acceptable level of comfort. This will help reduce energy consumption without compromising the well-being of the occupants.
• Limit as much as possible the number of rooms requiring active heating. Unused spaces can be maintained at a minimal temperature to avoid humidity and condensation problems.

Insulation Improvements

• Consider adding external insulation to your building to further improve the efficiency of thermal inertia and reduce heat loss.
• Choosing an external insulation solution helps preserve the thermal inertia inside the building and optimizes comfort throughout the year.

Exercise Caution with Inserts

Caution: while it may be tempting to use an insert to supplement the heating of a room, this does not necessarily guarantee better energy efficiency. These inserts often have poor efficiency and high levels of harmful emissions. Their uneven heat distribution within the room can actually make heating less comfortable.

Overall, leveraging thermal inertia in old buildings can offer many advantages in terms of comfort and energy consumption. Properly adjusting your heating system parameters and considering improvements such as external insulation to optimize these benefits.

Even if energy savings may seem modest in the short term, their cumulative impact on your heating bill will be significant – all without sacrificing the well-being of the occupants!