Optimizing your heating: Solar thermal energy in Renens

With an altitude of 420 meters and a favorable global irradiation of 1371 kWh/m²/year, the Renens area benefits from sunshine suitable for solar installations.

The decision to undertake thermal renovation fits perfectly with the municipality's strategy, which holds the 'Energy City Gold' label, aiming for a drastic reduction in greenhouse gas emissions and an increased share of local renewable energy.

Heating needs, illustrated by 2758 degree-days, demonstrate the importance of improving the building's energy efficiency.

The ideal time to install a solar thermal system is when replacing your boiler or during a comprehensive roof renovation. By planning these works, you anticipate future energy requirements while contributing to the goals of the municipal Climate Plan.

Taking action now helps limit costs by bundling interventions and allows you to enjoy increased thermal comfort during the frost periods, which total an average of 48 days per year in Renens.

Sizing a solar thermal installation depends on your domestic hot water consumption and heating requirements. Solar thermal collectors generally cover a large part of the hot water demand in summer, making the investment particularly relevant as a complement to a conventional system.

The choice between flat-plate and vacuum-tube collectors is crucial: the former are robust and suitable for most roofs, while the latter offer higher efficiency in cold or diffuse weather conditions.

Integrating a solar system with a heat pump requires a rigorous sizing study. This hybrid approach optimizes energy production based on external conditions. In addition, the choice of the storage tank, its capacity, and its thermal insulation are determining factors for overall performance.

Talking to a professional helps define the ideal configuration that best suits your building's typology while ensuring optimal longevity for your energy installation.

Renens has a varied building stock, ranging from old constructions to more recent buildings. For any renovation involving the roof, it is essential to check the condition of the framework and insulation before considering the installation of collectors.

Buildings dating from before 1990 may present risks related to the presence of asbestos in building materials. A preliminary diagnosis makes it possible to identify these substances and secure the site appropriately, guaranteeing the health of occupants and workers.

Furthermore, the match between the existing heat distribution network and the solar installation is a major point of vigilance. An aging hydraulic system might require an overhaul before integrating a high-performance solar solution.

Assessing the overall thermal insulation of your home remains an essential step so that solar energy is not lost through thermal bridges or excessive heat loss. A professional can audit your installation to ensure that the project is technically consistent with the structure of your building in Renens.

Regarding authorizations, the Canton of Vaud greatly simplifies the procedures. For the installation of solar panels, you are generally subject to the simplified building permit procedure (exemption from building permit).

This rule applies widely, unless your building is protected, located in a protected zone, or if the work results in a major change in the external appearance or dimensions. However, it is recommended to always contact the technical services of the municipality of Renens to confirm the specific situation of your plot.

In case of doubt, or if your home is located in an area of heritage importance, the municipal authorities can guide you through the necessary steps to respect local aesthetic constraints. Although the procedure is simplified, a prior administrative check is a safety guarantee to avoid any future litigation.

Do not forget that the municipality's objective is to promote the energy transition while preserving the architectural quality of the urban fabric, in accordance with its Climate Plan.

To reduce the cost of your work, the Building Program (VD) offers grants for solar thermal installations, intended for domestic hot water or heating support. The contribution can be a flat rate or calculated per square meter of installed collectors.

It is mandatory to submit your grant application before starting work, as no project started can receive aid retrospectively. Check the official website for technical details and current criteria.

Tax-wise, the canton allows the deduction of investments intended to save energy. The deduction rate for these expenses is 100%. If the costs cannot be fully taken into account in the year of the investment, the balance can be carried forward to the two following tax periods.

You must choose between deducting effective costs or a flat rate for each property. Note that if you receive public grants, only the portion remaining at your expense is deductible. These incentives facilitate the realization of high-performance projects in Renens.

The implementation of a solar thermal project in Renens follows a structured process to guarantee the quality of the work. The first phase consists of the feasibility study, including the analysis of sunshine and the audit of the existing heating system.

Once the quotes are validated and the grant applications submitted, materials can be ordered. It is better to prefer milder seasons, although frost is not a major obstacle once the roof work is secured.

The installation itself takes place in several stages : setting up anchors, installing solar collectors, hydraulic connection to the technical room, and integration into the storage system. A testing and commissioning phase is then necessary to verify tightness and correct heat transfer.

Good site monitoring, carried out by competent professionals, ensures execution in accordance with standards. By anticipating administrative deadlines, you ensure a smooth deployment of your project before the cold season.

Avoid at all costs neglecting the structural condition of your roof before planning an installation. Never start work before receiving a positive response or at least submitting your grant application.

It is also risky to underestimate the importance of a comprehensive thermal study, as an oversized or undersized installation loses efficiency.

Before requesting quotes, check the following : Is my heating system compatible with a solar extension? Is the roof free of asbestos or materials requiring asbestos removal? Have municipal authorizations been checked with the competent service? Have I identified a certified company for installation?

Have I consulted the Building Program conditions? Rigorous preparation is the key to success. Make sure the installer offers a maintenance contract to ensure the durability of your thermal system in the long term.