Guide
Switching from gas to a heat pump on the Côte d'Azur: costs, subsidies and the case for doing it now
A significant number of villas and older apartments on the Côte d'Azur still use gas boilers for central heating. If yours is one of them, the economics of switching to a heat pump have improved substantially in recent years, and the arguments for staying on gas have weakened. This guide covers the running cost comparison, what a switch costs, which subsidies apply, and why the Mediterranean climate is particularly well-suited to heat pump technology.
How do running costs compare: gas boiler vs heat pump?
The comparison comes down to the cost per kWh of usable heat delivered to your home. Both figures depend on current energy prices and system efficiency, so treat these as illustrative rather than fixed:
- Gas boiler: gas in France costs approximately 0.11-0.14 EUR/kWh (varies by supplier and consumption tier). A modern condensing boiler at 90% efficiency delivers heat at roughly 0.12-0.16 EUR per kWh of heat output.
- Air-to-water heat pump: electricity in France costs approximately 0.23-0.27 EUR/kWh. But a heat pump with a SCOP of 4.0 delivers 4 kWh of heat for every 1 kWh of electricity. That means heat costs approximately 0.06-0.07 EUR per kWh of heat output.
At typical 2026 prices, switching from a gas boiler to a heat pump roughly halves the running cost of heating. For a property that uses 15,000 kWh of heat per year (a medium-sized villa), that's a saving of around 700-1,200 EUR per year depending on current gas and electricity prices.
For oil boilers, the comparison is sharper. Heating oil in France costs approximately 1.60-1.80 EUR per litre (fioul prices are volatile; this reflects April 2026 levels), and a litre contains roughly 10 kWh of energy. At 85% boiler efficiency, that works out to approximately 0.19-0.21 EUR per kWh of heat, making oil the most expensive of the three options.
Why the Riviera climate makes the case even stronger
Heat pumps work by extracting heat from outdoor air. The colder the outdoor air, the harder they have to work, and the less efficient they become. The Mediterranean climate in PACA is mild by French standards: Nice averages around 8-10°C in January, Cannes slightly higher. Temperatures rarely fall below 5°C even at night in coastal areas, and inland locations in departments 06 and 83 see only occasional frosty nights.
This matters because the SCOP of an air-source heat pump in PACA is typically higher than the EU label figure, which uses a Strasbourg reference climate. A system rated at SCOP 3.8 on the label might achieve SCOP 4.2-4.5 in a coastal Riviera location. The mild winters that make gas seem unnecessary for much of the year also make heat pumps exceptionally efficient for the weeks they are needed.
What does a gas-to-heat-pump switch actually cost?
The installed cost depends on whether you're fitting a reversible split system (PAC air-air) or a full air-to-water system (PAC air-eau) to replace your existing wet heating circuit:
- PAC air-air (reversible splits): 2,500-6,000 EUR installed for a single-zone system, up to 8,000-12,000 EUR for a multi-split covering a whole property. Does not replace a wet radiator system. Provides both heating and cooling through wall or ceiling units. This is the simpler, lower-cost switch if your property doesn't have or need a wet heating circuit.
- PAC air-eau (air-to-water): 8,000-18,000 EUR installed, depending on property size and whether the existing radiators need upgrading or supplementing with underfloor heating. Replaces the gas boiler directly in the heating circuit and can also supply domestic hot water. More complex and expensive to install, but directly equivalent to a gas boiler and eligible for higher subsidy rates.
See our full heat pump cost guide for detailed cost ranges.
What subsidies are available for switching from gas?
For air-to-water heat pumps (PAC air-eau) in a primary residence, the main routes are:
- MaPrimeRénov': the main government grant. The amount depends on your income band. PAC air-eau qualifies for MaPrimeRénov' par geste. PAC air-air (splits) does not qualify since January 2025.
- CEE (Certificats d'Economies d'Energie): energy supplier subsidies that apply regardless of income, for both PAC air-eau and PAC air-air systems meeting the COP threshold. Handled by your installer. See our CEE guide.
- Éco-PTZ: zero-interest loan covering the installation cost, available alongside MaPrimeRénov'. Up to 15,000 EUR for a single eligible measure. No income conditions. See the Éco-PTZ entry for current ceilings.
- TVA at 5.5%: the reduced VAT rate applies to air-to-water heat pump equipment and labour in qualifying residential properties (over 2 years old). Applied automatically by an RGE-certified installer.
Check current grant amounts at maprimerenov.gouv.fr; rates change and we don't publish specific figures to avoid quoting outdated amounts.
What does switching do to the DPE?
Replacing a gas boiler with a heat pump typically improves the DPE by 1-2 letter classes, depending on the property. Two factors drive this:
- The energy consumption sub-score improves because a heat pump uses 3-4 times less primary energy per kWh of heat than a gas boiler, given France's primary energy conversion factors.
- The emissions sub-score improves significantly because electricity in France has a much lower carbon intensity than gas, thanks to the nuclear-heavy generation mix.
For properties sitting at E or F on the DPE, a heating system switch combined with roof insulation can often achieve the two-letter-class improvement required for MaPrimeRénov' parcours accompagné and the full subsidy rates that come with it.
Is there any reason to stay on gas?
For most Riviera properties, no. The running cost advantage of a heat pump is clear, the subsidies are available now, and the Mediterranean climate maximises heat pump efficiency. The arguments that held up a few years ago have weakened: electricity prices have risen but gas prices have risen more, and heat pump technology and installer networks have improved.
The cases where staying on gas might make sense are narrow: a property where the gas connection has recently been upgraded, where the existing wet heating circuit runs at very high flow temperatures and upgrading radiators is not feasible, or where the renovation budget cannot stretch to the upfront installation cost even after subsidies. These situations exist but they're the exception.
The one choice that genuinely deserves thought is between PAC air-air and PAC air-eau. If your property doesn't have a wet heating circuit and you'd need to install one, the cost of a full air-to-water system rises substantially. In that case, a reversible split system gives you both heating and cooling at lower upfront cost, and you can combine it with a thermodynamic hot water heater for domestic hot water. The result covers all three needs for less than a full PAC air-eau retrofit on an unmodified property.