PAC hybride: what a hybrid heat pump system is in France

How does a PAC hybride system work in practice?

During the milder months (autumn through spring in most of France), the heat pump runs alone. It extracts heat from outside air and transfers it into the property, producing several times more heat than the electricity it uses. This is efficient and cost-effective when electricity and gas prices are at their usual relationship.

When outdoor temperatures fall below the configured balance point, the control system activates the gas boiler instead. At very low temperatures, a standard air-source heat pump's efficiency falls. In a hard frost, gas tends to produce heat more cheaply. You get the heat pump's lower running cost for most of the winter, and the boiler's full output on the coldest days.

The two components can be a single integrated unit (some manufacturers produce a combined cabinet) or two separate units working together through a shared control system.

What's the difference between a PAC hybride and a standard heat pump?

A standard PAC (heat pump) operates without a gas backup. For most of France, a modern cold-climate heat pump can operate efficiently at temperatures well below 0°C, reducing the practical need for a gas backup. On the Côte d'Azur specifically, winter temperatures rarely drop to the point where gas becomes more cost-effective, and a standalone heat pump handles the entire heating season efficiently. A PAC hybride makes most sense in colder parts of France, where long cold spells happen. It also suits owners moving away from gas in stages who want to keep the boiler as a fallback.

What subsidies are available for a PAC hybride in France?

Since 1 September 2026, a PAC hybride gets no MaPrimeRénov': the grant now excludes any heat pump with a backup that can burn gas or oil. The same rule applies inside a whole-house rénovation d'ampleur. A hybrid is also taxed at 20% TVA (French VAT), since March 2025, where a standalone air-to-water heat pump gets 5.5%.

CEE credits may still apply. Get the installer to confirm by email which CEE bonus, if any, their quote qualifies for. If grants matter to you, compare the quote against a standalone heat pump, which keeps MaPrimeRénov' in a principal residence.

What a PAC hybride devis should itemise

If a contractor quotes a PAC hybride, the devis (written quote) should show the heat pump specification and gas boiler specification as separate line items, with the control system identified separately. This allows you to see what you are paying for each component and to compare the heat pump specification against a standalone heat pump quote. Ask at what outdoor temperature the boiler takes over, and how efficient the heat pump still is at that point.

Is a PAC hybride a good choice on the Côte d'Azur?

For coastal properties (Nice, Cannes, Antibes, Menton), a standalone reversible heat pump is generally the better choice over a PAC hybride. The Côte d'Azur climate keeps heat pump efficiency high throughout winter, and the cost and complexity of adding a gas component is rarely justified. For inland properties at altitude (Grasse, Valbonne, the Var hills), where winters are sharper, the hybrid argument has more weight. See our full guide to hybrid heating systems on the Côte d'Azur.

More on hybrid heating, grants and installers

• PAC (Pompe à Chaleur, heat pump): the standard heat pump, without gas backup
• MaPrimeRénov': the main grant, which no longer funds a heat pump with a gas or oil backup
• RGE certification: required for subsidy access
• CEE: energy supplier subsidy scheme
• Hybrid heating systems on the Côte d'Azur
• Gas heating vs heat pump in the south of France