Duurzaam Actief is a consultancy and engineering firm specialized in challenges in the sustainable energy transition. The combination of consultancy, engineering and realization is the key to a powerful end result. Duurzaam Actief can act as project developer for sustainable heating and cooling systems but also as engineering partner for building owners, Energy Service Company`s (ESCo`s), colleague consultant company`s and mechanical installation firms. Telephone: +31653604044 E-mail: s.beltman@duurzaamactief.nl