In Geneva, compare heating, solar generation and storage using your building’s data. Savings depend on consumption, equipment and the tariff for your address; a battery is not automatically necessary.
Start with the building and its energy use Request an assessment of heating demand, insulation, emitters and operating temperatures. Heat-pump consumption cannot be inferred from a fixed share of every household’s bill. Compare settings, renovation and replacement using seasonal performance and full cost.
Align generation and consumption Compatible scheduling can shift some hot-water preparation or heating towards solar hours. Check controls, comfort, efficiency and warranty. A heating buffer and a domestic hot-water tank serve different purposes. Increasing self-consumption is not useful if it creates unnecessary consumption.
Assess winter separately Request monthly and hourly profiles: solar generation and heating demand do not coincide throughout the year. High winter self-consumption does not mean panels cover all heating. Include necessary grid purchases, periods without sunshine and actual tariffs in the calculation.
Assess the battery and backup Physical storage is limited by power, usable capacity and state of charge. Compare a version without a battery for the same home and uses. A commercial “virtual storage” credit supplies neither heat nor power during an outage. Separately confirm backed-up circuits, heat-pump starting requirements and switching time.
Have professionals configure controls Weather forecasts and control functions depend on models and interfaces. Ask which functions are supplied and tested. Do not prescribe overheating or deep discharge from a general rule: limits must suit the building, occupants, manufacturer and backup reserve.
Prepare the budget and grant applications Separate photovoltaic equipment, heating, storage and additional work in the quote. Confirm grants and application timing before deducting support. Compare costs, maintenance, finance and replacement under several tariff and consumption assumptions.
A scenario to examine in Geneva: a condominium with shared heating Consider a building where several owners are planning a renovation together. This example describes a decision to prepare, rather than a feature of every Geneva home. Before comparing equipment, identify who can commission the work and how investment, charges and benefits will be allocated.
Clarify the meter’s scope: shared areas, communal heating or apartments. A saving calculated for the entire building does not automatically produce the same reduction in each private bill. Request a diagram of energy flows and an allocation method the owners’ meeting can understand.
Then examine service continuity. Which shared equipment must operate during an interruption? Who monitors alerts and authorises an intervention? Include responsibilities in the offer and check compatibility with existing contracts.
For the vote, present alternatives with full costs and effects on each co-owner. Include necessary permissions, timing and maintenance conditions. Assess collective financing on its own terms rather than applying a detached-home calculation directly.