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The lifespan of renewable energy systems can vary depending on the type of system and the quality of the system. In general, photovoltaic systems have a lifespan of 25 to 30 years, heat pumps around 15 to 20 years and wind turbines can be operated for up to 20 years or more. With regular maintenance and good care, you can maximize the lifespan of your system.

Modern heat pumps are designed to generate as little noise as possible. Noise levels are generally between 35 and 45 decibels, which is comparable to the noise level of a quiet conversation. When choosing a heat pump, you should look for quiet models and plan the installation so that the noise remains within an acceptable range.

Yes, in many countries there are state subsidies and grants for the installation of renewable energies. These subsidies can significantly reduce investment costs and make the use of renewable energy even more attractive. The exact funding options vary depending on the region and type of project.

The savings from renewable energy depend on various factors, such as the size of the installation, your energy consumption and local energy prices. On average, households and businesses can reduce their energy costs by up to 50% by using renewable energy.