Schmitz

In January 2026, we had a heat pump installed by Marc Schmitz. The existing natural gas boiler in the attic was removed. Consultation, installation, and commissioning went completely smoothly. Our technician, Mr. Kösem, and his team set up the system in the basement in three days. We are very satisfied with the result. The Vaillant Arotherm Plus has been running perfectly ever since.

For several years now, this company has reliably serviced our gas heating system. We have consistently been impressed by the expertise of gas specialist Mr. Dyckx! This summer, Marc Schmitz installed a Vaillant heat pump for us. Everything went perfectly, from the planning and quote to the installation. I was particularly pleased that all the work, from excavating the foundation to the electrical connection, was carried out by the same company, and everything ran smoothly and seamlessly. The existing solar thermal system was easily integrated into the new system. I am very impressed with the

We had an air conditioning system installed by the company Marc Schmitz. An employee came out, inspected everything, and gave us a quote. A week later, the air conditioner was installed, and everything was completed in a day and a half. Any minor issues were resolved quickly and courteously. If the system lives up to its promises, we will be very satisfied with the company's service and value for money.

Marc Schmitz did a truly outstanding job repairing our heating system. The advice was fair, as was the cost calculation. Despite generally difficult times, the replacement parts were procured quickly and installed expertly. We are completely satisfied with this service.

For our detached house in Cologne, we were looking for a competent local heating engineer to replace our 31-year-old gas heating system with central hot water supply and a heat pump. Of four contractors, Mark Schmitz GmbH submitted the most compelling offer. Mr. Deis's project planning was straightforward from the start and tailored to our specific needs, and Mr. Fritz eloquently answered all our questions on-site. The installation, carried out incredibly quickly and without any problems by the highly competent Mr. Kösem and two motivated colleagues, was completed in just three days. Ms. Zeh