Local guide
Heat pump installation in Grasse and the arriere-pays
Grasse sits at around 350m above sea level, about 20km inland from Cannes. Winter temperatures here are noticeably cooler than the coast: average January lows of 3 to 4°C and short cold spells below zero are normal. Further into the arriere-pays, the elevation rises sharply. Villages such as Saint-Vallier-de-Thiey, Gourdon (760m), and Cabris (around 410m) see significantly colder winters. This changes the heat pump calculation in important ways compared to properties on the coast, where heating is almost a secondary use of a system bought primarily for cooling.
Why does the inland climate change the heat pump decision?
On the coast, a reversible split heat pump is mostly a cooling device with a useful heating function for mild winters. In the Grasse area, heating is a real and significant part of the annual energy load. A properly sized system can handle it, but the equipment needs to be specified for the actual conditions rather than for coastal use.
Air-source heat pumps are tested and rated at standard conditions (7°C outside air temperature). Efficiency and output both drop as temperatures fall. For properties in the higher arriere-pays villages, check the manufacturer's performance data at low temperatures, not just the headline SCOP figure. Most modern inverter-driven units operate down to -15°C or -20°C, but their output at those temperatures is meaningfully lower than at 7°C. Sizing the system slightly above the calculated minimum for an elevated property is reasonable insurance.
What system type works best for properties in the Grasse area?
The right answer depends on how the property is currently heated:
- If there is no existing wet heating system (radiators or underfloor): a reversible multi-split with wall-mounted indoor units covers both heating and cooling. This is the most common residential installation across the area.
- If the property has an existing oil or gas boiler with radiators: an air-to-water heat pump (PAC air-eau) connects to the existing wet circuit and replaces the boiler. This avoids running refrigerant pipework to individual rooms.
- For larger properties needing both space heating and cooling: a combination is sometimes used, with an air-to-water system handling the radiator circuit for winter and a separate reversible split handling summer cooling in living areas.
Air-to-water systems are more common in the Grasse area than on the coast, because many properties here were built with central wet heating rather than the wall-unit split systems typical of newer coastal apartments.
Does switching from oil heating to a heat pump make sense here?
Many properties in Grasse and the arriere-pays run on fuel oil (fioul domestique). There is no mains gas network across much of this inland territory. Oil prices are volatile and have risen substantially in recent years. For a property with a real heating load at altitude, the running cost case for switching to a heat pump is stronger here than on the coast.
MaPrimeRénov' specifically supports replacing oil boilers with heat pumps. The grant amounts for this switch are among the higher rates in the scheme, and CEE credits arranged by the installer stack on top. For current figures, use the simulator at maprimerenov.gouv.fr before collecting quotes. The combination of grants can reduce the net cost of a qualifying installation significantly, though amounts depend on income band and are reviewed periodically.
Subsidy figures change periodically. Confirm current amounts with your installer or at maprimerenov.gouv.fr before making decisions based on specific figures.
What should an air-to-water heat pump quote include?
A devis for replacing an oil boiler with an air-to-water heat pump should specify:
- The heat pump unit: brand, model, capacity in kW, and SCOP rating
- Any modifications needed to the existing radiator circuit (older radiators designed for high-temperature systems may need replacing for efficient low-temperature heat pump operation)
- The domestic hot water cylinder, if the oil boiler also served hot water
- All pipework, electrical connections, and commissioning
- The contractor's RGE qualification number
- TVA rate applied (5.5% for PAC air-eau installation on residential properties over 2 years old)
A quote that groups these items into a single lump sum makes comparison difficult and often means the scope is unclear on both sides. Ask for an itemised devis before signing.
What to look for when choosing a contractor inland
Contractor coverage inland varies. Some HVAC companies based on the coast do not readily travel to Grasse or beyond. When gathering quotes, confirm the contractor is familiar with the specific conditions: altitude, colder winter temperatures, and the property's existing heating configuration.
An installer with experience only in coastal split-system cooling installations may not be the right choice for a full boiler-to-heat-pump replacement at 400m. Ask what comparable inland installations they have completed. Contact us for referrals to contractors who work regularly in the Grasse area.