Educational institutions see several reasons for a sustainable renovation. 1. Indoor climate. A too high CO2 content. 2. Costs. The operating costs are increased by (i) increasing energy prices and (ii) maintenance. 3. Sustainability. A moderate energy label.

The most common measures to: (i) improve the indoor climate, (ii) control costs, and (iii) the energy label upgrade are:

Wall insulation, external wall insulation, roof insulation, HE glass, energy efficient lighting, Heat Pump, Solar, PV panels