The ISDE subsidy provides financial support for the purchase of air-to-water heat pumps. Depending on the type and capacity of the pump, this subsidy ranges from €2,250 to €4,000 per pump. Starting January 2024, subsidies will only be available for heat pumps with at least an A++ rating. At DLE, this is not an issue, as we exclusively install heat pumps with the highest energy labels, such as A+++, ensuring that customers always qualify for the subsidy.