About Us

Personal. Independent. Competent.

Dipl.-Ing. Jesco Grün combines engineering precision with personal consulting. As a certified energy efficiency expert, I guide you from the initial analysis to the successful implementation of your energy renovation.

Dipl.-Ing. Jesco Grün

Energy Consultant / Efficiency Expert

KfW-gelistetBAFA-zugelassenTU Darmstadt

Your Energy Consultant in Siegerland

With a degree from the Technical University of Darmstadt and extensive hands-on experience, I offer well-founded, manufacturer-independent consulting. My goal: the most economical and ecological solution for your building.

My Values

🎯

Tailored solutions instead of standard recipes

🤝

Personal support from A to Z

🔍

Manufacturer-independent consulting

📐

Engineering precision

Qualifications

Diploma Engineer

Technical University of Darmstadt

Energy Efficiency Expert

KfW-listed for residential and non-residential buildings

BAFA-approved Consultant

Federal Office for Economic Affairs and Export Control

GEG Expert

Building Energy Act — Energy Certificates

Service Areas

Siegen Office

Siegen, Kreuztal, Netphen, Freudenberg, Wilnsdorf, Neunkirchen, Burbach, Hilchenbach, Erndtebrück, Bad Berleburg, Bad Laasphe, Betzdorf, Olpe, Haiger, Dillenburg

Königstein Office

Königstein im Taunus, Frankfurt, Bad Homburg, Oberursel, Kronberg, Schwalbach, Kelkheim, Rhein-Main-Gebiet

Let's get to know each other

I look forward to your inquiry — the initial consultation is free.

Get in Touch →

Insights Into Our Work