New windows: plan air renewal
Published on 4 August 2026 · Verified on 18 September 2026 · The Mestravaux.lu team
Window replacement is a time to check how air enters and leaves the home. This does not depend on a minimum window count. Check before choosing air inlets and trims.
The essentials in 30 seconds
- Identify existing ventilation before selecting inlets.
- Coordinate window and ventilation work in quotes.
- Plan checks and operating guidance after installation.
Treat airtightness and air renewal together
Klima-Agence links envelope renovation with sufficient air renewal. More airtight windows do not remove the need to assess the existing system and its operation after work.
| Pièce | Fonction attendue | Contrôle |
|---|---|---|
| Séjour / chambre | entrée d'air | grille ou autre dispositif |
| Dégagement | circulation | passage sous portes |
| Cuisine / bains | extraction | débit et fonctionnement |
| Fenêtre | étanchéité | compatibilité avec le système |
Cette grille prépare la comparaison ; elle ne remplace pas le diagnostic du support et du produit précis.
Record components without changing them
Photograph visible inlets, outlets, controls and terminals. Note combustion appliances, cooker hoods and shared systems. Have air supply and extraction identified; a vent in every window is not a universal rule.
Define services before ordering
Ask who selects components, checks compatibility and makes adaptations. Include outside noise as a design concern where relevant. Quotes should specify retained, replaced and added parts and associated finishes.
Your project deserves an accurate estimate — it's free.
Request a quotePlan handover and follow-up
Specify operating checks and documents. Request explanations of controls, maintenance and required access. Report persistent humidity, odours or discomfort afterwards: these need assessment and do not alone establish defective windows.
Related guides to continue
- Mist on new windows: locate it firstStart by locating the mist. Its presence alone does not assign the problem to glazing, installation or use. This guide prepares a request for inspection, without remote diagnosis.Read the guide
- Windows and façade insulation: coordinate junctions and sequencingSequencing depends on the wall, retained or replaced windows and proposed façade. Before choosing dates, ask how each stage prepares the next and protects the home between interventions.Read the guide
- Windows and noise: define the acoustic result you needYou want to sleep beside the street or work without passing vehicles disturbing you. Describe that problem and have the elements needing treatment identified before ordering glass. A brochure figure alone does not promise a result inside the room.Read the guide
- Double or triple glazing: compare variants for your homePane count alone cannot select a window. Request identified variants and compare performance and cost within the same project. No average premium or payback is claimed without verifiable offers.Read the guide
Frequently asked questions
Does every window need an inlet?
It depends on the system. Confirm the need and location across the home.
Can this guide determine airflow?
No. System selection and settings require assessment of the home.
Does ventilation prevent all condensation?
Do not rely on that guarantee. Have causes investigated if water or mould appears.
Take action
Your project deserves an accurate estimate — it's free.
Request a quote