Free on-site study
Free visit, no obligation. Measurements, photos, calculations. If we consider your project is not technically or financially viable, we will tell you.

Our story
I.ON was founded by Dr. Oscar Axe and engineer Jean-Paul Noujeim. Over a decade of combined experience in advising and implementing energy renovation projects in Switzerland.
Our conviction: every home and every budget is unique. We refuse standardised solutions. Our studies take into account real consumption, orientation, the existing heating system and the long-term ambitions of the owner.
We subcontract nothing. From the initial study to maintenance ten years after commissioning, it is our own technicians who intervene. This vertical integration allows us to contractually guarantee the performances announced in the quote.
Our headquarters are in Rolle, in the canton of Vaud. Our service areas cover Vaud, Geneva, Fribourg and Neuchâtel. Our technicians come from the regions they serve — a site visit is always a real commitment, and we ensure availability is an operational reality, not a marketing promise.
In numbers
Our approach
Study, installation, commissioning and maintenance are all carried out by our in-house team. We guarantee the performances we announce because we control the entire chain.
We source exclusively from recognised European market manufacturers. Inverters, panels, heat pumps, batteries — each component is validated for long-term reliability.
We handle all administrative procedures: grid operator declarations, cantonal and federal subsidy applications, EPC files. You sign once.
Six trades
Our vertical integration is not a marketing argument: it is an organisational reality. Six complementary trades under one roof, a single point of contact for the client.
Study, sizing, on-roof or integrated installation. 10-year production monitoring.
View serviceAir-to-water, geothermal, water-to-water. SIA thermal study, precise sizing, parameterised commissioning.
View service11 and 22 kW residential stations, multi-charger fleet sites. Solar coupling and OCPP supervision.
View serviceDaikin, Mitsubishi, Panasonic wall units. Silent installation, OPB compliance, permits managed.
View serviceCoupled to an existing or new PV installation. BYD, LG, Fronius. Self-consumption up to 80%.
View serviceEnDK-certified expert. Official energy audit, 20-year action plan, subsidy support.
View serviceService areas
Our headquarters are in Rolle, on Route de Gilly. This is our technical base, our materials stock, and the starting point for our teams. Our technicians live in the regions they serve: no long journeys, no last-minute rescheduling.
Our commitments
Free visit, no obligation. Measurements, photos, calculations. If we consider your project is not technically or financially viable, we will tell you.
Detailed quote delivered within one week of the visit. Brands specified, warranties listed, administrative procedures costed.
For heat pumps, the designed seasonal COP is contractually guaranteed. If a measured discrepancy is found in the first season, we correct it.
For solar installations, production monitoring is included for 10 years. Any abnormal drop is detected and addressed within 48 hours.
Cantonal building programme, Pronovo one-off remuneration, municipal aids. 100% of applications filed by us. No administrative burden for you.
All our electrical installations comply with OIBT and receive a commissioning report. Document delivered at handover.
Our blog
We regularly publish detailed analyses on solar panels, heat pumps, EPC certificates, EV charging and energy renovation in Western Switzerland. Real prices, field ranges, pitfalls to avoid — the content we wish we had found when we started.
Free quote
On-site visit, consumption analysis, detailed cost simulation. Full quote delivered within seven days. If your project is not technically or financially viable, we tell you straight.
A question?
The I.ON team replies.