The intention was to make primary school Brekeldschool energy efficient. A design for an installation including an air/water heat pump was already prepared. This was expected to yield low energy consumption. Ipero was asked to review the draft. Despite the system being small, many mistakes were found in the design presented. Ipero offered solutions. Without this contribution, the heat pump would have quickly ceased to function and many unnecessary parts would have needed replacing, all which would have led to higher operating costs.