VMC installation on the Côte d'Azur
A VMC (ventilation mécanique contrôlée, mechanical ventilation) is the fan that keeps air moving through a French home. In older Riviera flats and villas it's often blocked or dead, and a failed VMC is a common cause of mould. We connect English-speaking homeowners with certified contractors who install, upgrade and maintain them.
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Get quotesOn this page6 sections
- What is a VMC and why do most expat homeowners not know about it?
- Which VMC system is right for your property?
- What pushes up the price of a new VMC in a Riviera home?
- Why does ventilation matter more on the Côte d'Azur?
- French terms you'll see on a VMC quote
- Frequently asked questions about VMC and ventilation
English-speaking specialists
What is a VMC and why do most expat homeowners not know about it?
British and American homes mostly breathe through trickle vents, gaps and open windows. French homes use a VMC: a fan, usually in the loft or a cupboard, that pulls air out of the kitchen, bathrooms and WC. Fresh air comes in through small vents above the windows in the other rooms. It's been required in new homes since 1982.
Nobody mentions it when you buy. It's hidden and estate agents don't bring it up. Most owners only find out it has been blocked or broken for years when mould appears.
If the house sits empty for months, the VMC is the only thing moving air through it. A place that smells damp when you arrive, or has mould in the bathroom, usually has a VMC that isn't doing its job.
System types
Which VMC system is right for your property?
Most common in existing buildings
VMC simple flux hygroréglable (hygro B)
The standard fit in French homes built or renovated in the last 30 years. Vents in the wet rooms open wider when there's moisture, after a shower or while cooking, and close down when the rooms are dry. That way the fan isn't pulling warm air out of an empty house.
For most existing Riviera properties, replacing a failed simple flux with a new hygroréglable unit is the usual recommendation. It uses less energy than the fixed-speed autoréglable type it replaces and costs far less than double flux.
VMC simple flux autoréglable
Extracts at the same rate all day, whatever the humidity. It's the oldest and simplest type. It works, but it wastes heat by running at full rate in dry, empty rooms. Most of these units in older buildings are past their service life, so ask for a hygroréglable replacement.
VMC double flux
Pulls stale air out of the wet rooms and blows filtered fresh air into the living rooms and bedrooms. Both streams pass through a heat exchanger, so the incoming air picks up warmth from the outgoing air. It needs a second set of ducts and a bigger unit. It suits a full renovation or a well-insulated house where little air leaks in on its own. Ask where the ducts will run and how you'll reach the filters.
VMC thermodynamique
A double flux system with a small heat pump that uses the warmth in the outgoing air to heat your hot water. It's a niche choice and only makes sense when the ventilation and hot water are being replaced together.
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Get quotesWhat drives the price
What pushes up the price of a new VMC in a Riviera home?
The old ducts decide a lot. Sound ones can take a new unit as they are. Crushed or torn flexible duct has to come out of the loft or ceiling void. Ask whether the quote reuses the ducts or replaces them.
Double flux adds a second set of ducts to every bedroom and living room. Without a loft, they need boxing in or a false ceiling, and that's building work in a finished home. Ask where each duct will run and who makes good.
Each wet room needs its own extract point, so three bathrooms cost more than one. In a copropriété (the building's co-ownership), a new outlet through a shared roof or façade needs the owners' approval first.
Hygroréglable and double flux systems are charged 5.5% TVA (French VAT) as energy renovation. A plain autoréglable is charged 10%. Both rates need a home over two years old and apply to second homes.
CEE bonuses (energy-saving premiums paid by energy suppliers) cover both, in a main or second home, if the installer holds an RGE (state-approved installer) ventilation qualification. The Riviera sits in the lowest-paying CEE zone, so the bonus is small and varies by supplier.
MaPrimeRénov' (the state renovation grant) dropped double flux as a single measure on 1 September 2026. It now funds a VMC only inside a whole-house renovation (rénovation d'ampleur) of a principal residence.
Get two written quotes for the same system. Each should name the model, the extract points and what happens to the old ducts.
The Mediterranean context
Why does ventilation matter more on the Côte d'Azur?
The coast is dry in summer. Winter is wetter than most expats expect: from October to March there's regular rain, sea mist and long humid spells, and the mild temperatures let the moisture hang around.
Old stone buildings in Nice, Antibes, Menton and the hill towns soak up that moisture and let it out indoors as condensation, then mould. A dehumidifier treats the symptom. If the air isn't moving, the mould comes back.
A house shut up from October to March usually greets its owners in spring with mould in the bathrooms, the wardrobes and on north-facing walls. Even a basic simple flux, left running, cuts that risk a lot.
In northern France, the push for VMC came partly from saving energy in well-insulated homes. Here the main job is moisture control in old, porous walls. Tell the installer that's your priority when you discuss which system to fit and how to set it up.
French terms
French terms you'll see on a VMC quote
Key French terms for this service
Questions
Frequently asked questions about VMC and ventilation
If your question isn't here, send it with your request and we'll answer it directly.
For new homes, yes. French rules have required permanent ventilation in new housing since 1982, and in practice that means a VMC. Older homes don't have to retrofit one, though a landlord must keep a rented home properly ventilated. Plenty of older Riviera properties have a VMC that's blocked or dead, and it usually shows up as mould.
Usually only if you're renovating anyway or the house is well insulated. Double flux needs a second set of ducts to every bedroom and living room, plus a bigger unit. In an older house where air already leaks in through walls and windows, a hygroréglable simple flux usually does the job with far less work.
It depends on age. A noisy simple flux unit of 10 to 15 years often just needs a new motor, which costs less than a new system. Blocked or dirty ducts are a separate cleaning job. If the system is over 20 years old, the ducts are in poor shape, or you're renovating anyway, replace it.
A double flux system needs its filters changed and its heat exchanger cleaned every year. That's routine, not a sign of trouble. Any VMC collects dust in its grilles and ducts over time, and a professional can clean them. If a sheet of paper won't stick to an extract grille, get the system checked.
Partly. CEE bonuses cover double flux and hygroréglable simple flux with no residence condition, as long as the installer holds an RGE ventilation qualification. The 5.5% TVA rate also applies to a second home over two years old. MaPrimeRénov' is out: it now funds a VMC only inside a whole-house renovation of a principal residence.
Sources
Official sources for VMC grants and TVA rules
- BOFiP: BOI-TVA-LIQ-30-20-95, reduced TVA on energy renovation work Lists double flux and hygroréglable simple flux ventilation among the work taxed at 5.5%; a plain autoréglable is not on the list.
- Ministère de la Transition écologique: CEE sheet BAR-TH-125 (double flux ventilation) The CEE bonus for a double flux system in an existing home, fitted by an installer with an RGE ventilation qualification.
- Ministère de la Transition écologique: CEE sheet BAR-TH-127 (hygroréglable simple flux) The CEE bonus for a hygroréglable simple flux system, with the same RGE condition.
- France Rénov': CEE aid for double flux ventilation CEE is open to owners and tenants of a main or second home more than two years old.
- Légifrance: décret n° 2026-822 of 25 August 2026 Takes double flux VMC out of MaPrimeRénov' as a single measure from 1 September 2026.
- Service-Public.fr: MaPrimeRénov' (F35083) The principal-residence rule and the whole-house renovation route where a VMC can still be funded.
Rules checked against these sources in September 2026.