The I.ON Blog
Understand energy, make the right choices.
Practical guides, real prices and installer advice on solar panels, heat pumps, EPC certificates and energy renovation in Western Switzerland.
Solar panels
03 articlesSolar photovoltaic grants by canton in French-speaking Switzerland in 2026
A complete tour of 2026 solar grants across Vaud, Geneva, Fribourg, Neuchâtel, Valais, and Jura. Federal one-time payment, cantonal programmes, municipal grants.
Read articleSelf-consumption or selling solar electricity: what to choose in 2026?
Should you consume your solar electricity yourself or sell it back to the grid in 2026? A detailed comparison for French-speaking Switzerland, with Romande Energie, SIG, and Groupe E tariffs.
Read articleHow much does a photovoltaic installation cost in French-speaking Switzerland in 2026?
Real 2026 prices for a photovoltaic installation, by output, in French-speaking Switzerland. Gross costs, Pronovo one-time payment, tax deduction, net cost calculation. I.ON Rolle field data.
Read articleHeat pumps
05 articlesHow does a heat pump work? The complete 2026 guide
How does a heat pump work? The principle simply explained: the refrigeration cycle in 4 steps, air, ground and water sources, COP, summer cooling. The complete 2026 guide.
Read articleReplacing an oil boiler with a heat pump in 2026: complete guide
Replacing an oil boiler with a heat pump in French-speaking Switzerland: procedures, costs, grants, timeline. The complete 2026 guide.
Read articleHow much does a heat pump cost in French-speaking Switzerland in 2026?
Real 2026 heat pump prices by type and by floor area in French-speaking Switzerland. Gross costs, grants, effective net cost calculation. Advice from I.ON Rolle (VD).
Read articleHeat pump grants in the canton of Vaud in 2026
Subsidies, municipal bonuses, and tax deductions for heat pumps in the canton of Vaud in 2026. Building Programme, procedures, and up-to-date amounts.
Read articleHeat pump in a rental building: feasibility and obligations in 2026
Installing a heat pump in a rental building in French-speaking Switzerland: rules, financing, rent pass-through, timeline. Guide for landlords and property managers.
Read articleEPC certificate
03 articlesIs the CECB mandatory in French-speaking Switzerland? Rules by canton in 2026
When the CECB becomes mandatory in 2026: specific rules for Vaud, Geneva, Fribourg, Neuchâtel, Valais, and Jura. At sale, renovation, and rental.
Read articleUnderstanding your CECB+ report: a step-by-step guide
How to read a CECB+ report in 2026: energy classes, action plan, investment scenarios. The guide for property owners in French-speaking Switzerland.
Read articleCECB or GEAK energy audit: what is the difference in 2026?
Common confusion between CECB and GEAK: these two tools are in fact the same certificate. Full explanation, French-speaking and German-speaking Swiss terminology.
Read articleEV charging
03 articlesHome EV charger in Switzerland: CHF 1,800 to 3,500 installed
Real 2026 prices for an 11 kW home charging point in French-speaking Switzerland: CHF 1,800 to 3,500 all-inclusive. Permits, grid notification and running costs explained.
Read articleEV chargers in co-ownership buildings: how to equip your building in French-speaking Switzerland
Installing EV chargers in a co-ownership building (PPE) in French-speaking Switzerland: general meeting decisions, shared infrastructure, financing, and neighbour law. Guide 2026.
Read article11 kW or 22 kW: which output to choose for your home charger in 2026?
Choosing between an 11 kW and a 22 kW charger in French-speaking Switzerland in 2026: actual need, vehicle capacity, three-phase supply, cost. The guide to making the right decision.
Read articleAir conditioning
02 articlesReversible air conditioning or air-to-air heat pump: what is the difference in 2026?
Reversible air conditioning or air-to-air heat pump in French-speaking Switzerland: understanding the difference, the use cases, and making the right choice in 2026.
Read articleIs air conditioning illegal in Switzerland? Rules for 2026
No, air conditioning is not banned in Switzerland: it is allowed under federal NSO noise limits and communal rules. Permits, co-ownership and dB limits by canton.
Read article
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