H. Rosenberger GmbH in Jona, Switzerland, specializes in professional timber construction, custom new builds, renovations and high-quality wood solutions. Since 2003, the company has delivered reliable craftsmanship and sustainable construction for private clients, architects and businesses. Services include timber consulting, planning and structural design, interior and exterior wood construction, staircase construction, dormer installations, roof windows, prefabricated element construction and terraces. With modern infrastructure and extensive expertise, Rosenberger creates durable and high-quality building solutions.

Hans Heggli AG – heizung24.ch in Rapperswil-Jona has been providing reliable heating and energy solutions for more than 60 years. The company offers complete heating services including planning, installation, maintenance and repair from a single source. Services include heat pumps, gas and wood heating systems, underfloor heating, radiators, solar energy solutions and smart home heating controls. With a strong focus on energy efficiency and sustainability, heizung24.ch creates future-proof heating concepts for residential and commercial customers.