Reversible heat pump installation on the Cote d'Azur

A reversible heat pump (PAC réversible) works on the same refrigeration cycle as a standard heat pump, but with a reversing valve that allows it to run in either direction. In winter, it extracts heat from outside air and transfers it inside — just like a standard heat pump. In summer, it reverses the process, extracting heat from inside the property and releasing it outside, exactly like an air conditioner. The unit itself is physically the same either way; the mode is typically switched from a remote control or thermostat. On the Cote d'Azur, where both winter heating and summer cooling are genuine requirements, a reversible unit handles both for roughly the same cost as buying just one of those systems separately.

For most properties on the Cote d'Azur, yes. A reversible split system costs around 8,000-15,000 EUR installed for a standard residential property — compared to perhaps 12,000-20,000 EUR if you installed a separate heat pump and a separate multi-split AC system. You also only have one set of equipment to maintain and service. The one scenario where separate systems can make sense is if you already have a working gas or oil heating system and only need to add cooling — in that case, a cooling-only split AC unit is a simpler and cheaper addition. But for new installations or full replacements, reversible units are almost universally the right choice on the Riviera.

Very efficient in both modes. In heating mode, a well-specified air-source reversible heat pump on the Cote d'Azur coast typically achieves a COP (coefficient of performance) of 3.5-4 in winter, meaning it produces 3.5-4 kWh of heat per kWh of electricity consumed. In cooling mode, the equivalent metric is the EER (energy efficiency ratio) or SEER (seasonal EER), and modern inverter units commonly achieve SEER ratings of 6-8. For context, a cheap portable AC unit might have a SEER of 2-3. The combination of mild winters and hot summers means both functions are in regular use, and the economics of running costs favour modern inverter reversible units strongly over direct electric or older refrigerant-cycle systems.

Yes, with the right system design. A single wall-mounted split unit will typically heat one large room or two connected rooms effectively. For whole-house heating, you need either a multi-split system (one outdoor unit driving multiple indoor units, one per room or zone) or a ducted system that distributes air through the property. Multi-split systems are the most common whole-house solution on the Cote d'Azur — they're relatively straightforward to install and allow independent control of each zone. For larger or older properties with existing radiator systems, a different approach using a heat pump connected to the wet system may be more appropriate. The right answer depends on your property — your installer should assess this before recommending a configuration.

Sizing depends on the heat loss of your property, which varies with floor area, insulation, ceiling height, window area and orientation. As a rough guide, a 100-120m2 villa in good condition on the Cote d'Azur coast typically needs around 6-8kW of heating capacity. In cooling mode, the same property might need 5-6kW of cooling capacity (the two requirements are often similar in this climate). For inland properties at altitude — Grasse, Valbonne, Tourrettes-sur-Loup — use more conservative figures because winter temperatures are lower. A proper heat loss calculation, done by the installer on-site, is the only reliable way to size a system. If a contractor quotes you without visiting the property, the sizing will likely be wrong.