Switching from gas to a heat pump on the Côte d'Azur: running costs, subsidies and the case for doing it now

Plenty of villas and older apartments on the Côte d'Azur still heat with a gas boiler. If yours is one of them, the sums have moved in favour of a heat pump. This guide compares running costs, what drives the price of the switch, which subsidies apply and why a mild coastal winter suits a heat pump.

How do running costs compare: gas boiler vs heat pump?

Compare what one kWh of heat in your rooms costs you. A modern condensing gas boiler turns most of its gas into heat. A well-sized air-to-water heat pump gives roughly four times as much heat as the electricity it uses.

In France a kWh of electricity costs more than a kWh of gas, but nowhere near four times more. So a heat pump heats for roughly a third of the cost of gas. Two things move that ratio: gas prices change month to month, and your real efficiency depends on how well the system is sized. Ask each installer to set your current gas bill against the electricity the heat pump would use.

Heating oil costs more again per kWh of heat, and its price swings from month to month.

Why does the mild Riviera winter favour a heat pump?

A heat pump pulls heat out of the outdoor air. The colder the air, the harder it works. On the coast January days are mild and it rarely gets cold even at night. Inland in the 06 and 83 you'll see only the odd frosty night.

The efficiency figure on the energy label is measured for a colder climate than ours. On the coast, the same machine usually does a little better than its label says. The winters that make gas feel unnecessary are the ones where a heat pump runs at its best.

What decides the price of switching from a gas boiler to a heat pump?

The type of heat pump comes first. Reversible splits (PAC air-air) are wall or ceiling units that heat and cool. They don't feed radiators, so they're the cheaper route if you don't have or need a wet heating circuit. Each room you add puts another unit and pipe run on the quote.

An air-to-water system (PAC air-eau) takes the gas boiler's place in the heating circuit and can also make your hot water. It costs more, but it's the direct replacement and the only one of the two that MaPrimeRénov' (the state renovation grant) funds. Its price follows the size of the house and whether some radiators need upgrading for the lower water temperature. Adding underfloor heating raises it further, and so can a bigger electricity contract.

Get at least two written quotes for the same system. Our heat pump cost guide goes into more detail.

Which subsidies help you switch from gas, and which need a main home?

Two of the four national aids need the house to be your principal residence. Second-home owners can still use the other two.

• MaPrimeRénov' (principal residence only): the main government grant, sized by household income. It funds an air-to-water heat pump as a single measure. Air-air splits are excluded and get nothing from it.
• Éco-PTZ (principal residence only): a zero-interest loan of up to 15,000 EUR for a single eligible measure, with no income condition. It can sit alongside MaPrimeRénov'. See the Éco-PTZ entry for the other ceilings.
• CEE (main or second home): energy-supplier bonuses with no income condition. Air-to-water units and air-air units that meet an efficiency threshold can both qualify. Your installer usually arranges it. See our CEE guide.
• TVA (French VAT) at 5.5% (main or second home): the reduced rate covers an air-to-water heat pump, equipment and labour, in a home more than two years old. The installer applies it on the quote once you've signed a statement confirming the home's age.

One trap: keeping the gas boiler as a backup turns the job into a hybrid system. A heat pump with a fossil-fuel backup is taxed at 20% TVA, and since 1 September 2026 MaPrimeRénov' no longer funds it.

Grant amounts change often, so ask your installer for the current ones, or see france-renov.gouv.fr. We don't print them here because they go out of date.

How does switching from gas to a heat pump affect your DPE rating?

Swapping a gas boiler for a heat pump usually lifts the DPE (energy performance certificate) by one or two letters. Both halves of the score improve:

• Energy use falls, because the heat pump needs far less energy for each kWh of heat.
• Emissions fall a lot, because French electricity comes mostly from nuclear and carries much less carbon than gas.

If your home sits at E or F, pairing the heating switch with roof insulation can often reach the two-letter gain that MaPrimeRénov' parcours accompagné requires. That route pays higher rates, and it too needs the house to be your principal residence.

When is staying on gas the better call?

For most Riviera properties, it isn't. The running costs above favour the heat pump and the coastal climate suits it.

The exceptions are narrow. Your gas connection may have just been upgraded. Your radiators may need very hot water to keep rooms warm, and replacing them isn't practical. Ask the installer whether the current radiators will heat the house at a heat pump's lower water temperature. Or the upfront cost may still be out of reach after subsidies.

The real decision is air-air against air-eau. If the house has no radiator circuit and you'd have to install one, air-to-water gets much dearer. Reversible splits then give you heating and cooling for less. Add a heat pump water heater for hot water, and all three needs are covered for less than a full air-to-water retrofit.

More on gas, heat pumps and the DPE

• Air-to-water heat pump installation
• Gas vs heat pump: full comparison
• Heat pump installation costs
• How to improve your DPE rating
• Heat pump brands for the Mediterranean climate
• COP and SCOP: efficiency ratings explained
• MaPrimeRénov': the main government grant