Ventilation systems: comparing air exchange, installation and costs
A ventilation system provides organised air supply and extraction. To work in everyday use, it needs to suit the premises and building. The appliance alone is not a complete ventilation concept. Useful quotes explain the areas served, building work and commissioning clearly.
Different systems can meet a requirement in different ways
Central supply and extract ventilation distributes fresh air through ducts and removes used air from designated areas. Individual-room units offer other arrangements with less ductwork inside the home. An extraction system requires suitable routes for outdoor air to enter. The differences affect installation, comfort and operation.
A new building offers different possibilities from an occupied home being retrofitted. For offices, shops or production, the concept needs to fit actual use. Ordinary residential ventilation is not automatically suitable for a restaurant kitchen’s extraction or capturing production substances. Describe the activity; technical system selection belongs with the professional.
| Approach | What planning needs to establish |
|---|---|
| Central supply and extract | Equipment position, duct network and supply to the designated rooms. |
| Individual-room ventilation | Wall or window integration, noise and coordinated unit operation. |
| Extraction | Exhaust route and sufficient, planned incoming outdoor air. |
| Cascade arrangement | Air routes between areas and suitable transfer openings. |
| Business use | Use-specific airflow and any specialist extraction. |
The complete air route needs to work
The system needs more than a fan. Outdoor-air intake, distribution, passages between rooms and exhaust form a connected arrangement. Closed doors or unsuitable openings can disrupt the planned flow. The design should therefore explain where air enters, moves and leaves the building.
Intake position affects the air drawn in. Sound transmission and draughts also need consideration. Where there is a fireplace, stove or other combustion appliance, interaction with extraction needs professional assessment. Customers do not have to measure negative pressure or certify safe joint operation themselves.
Coordinate retrofitting with other work early
In existing buildings, shafts, ceilings and façades determine possible routes. A central arrangement may make sense when interiors are already being renovated; other concepts may suit a smaller intervention. The same solution is not equally straightforward in every building.
Clarify drilling, power supply, coverings and reinstatement of affected surfaces. For multiple dwellings, access and work sequencing need coordination. When windows or the façade are being renewed, planning ventilation and the building envelope together is useful. Necessary local checks should precede installation rather than follow the equipment purchase.
Heat recovery does not automatically provide active cooling
Suitable heat recovery uses heat from extracted air to prewarm incoming air during the heating season. Fans still consume electricity. The actual overall balance depends on sizing, operation and the building; a general saving percentage would not be a reliable promise for your installation.
Moisture recovery can affect humidity balance but does not maintain one fixed value under all conditions. A summer setting or bypass also does not replace adequately sized active cooling. If temperature control, dehumidification or specialist air treatment is wanted, those additional functions should be discussed explicitly.
Settings and handover belong in the order
After installation, intended airflow and operating modes need professional setting and checking. An appliance running does not by itself prove that each room is supplied as planned. Quotes should identify balancing, measurements and documentation.
Handover should explain everyday settings, filters, messages and care. Maintenance access needs to remain genuinely usable. A promise of permanently perfect air or complete freedom from mould would be inappropriate: usage, care and other moisture sources also affect the outcome.
Compare the complete ventilation system, not just the appliance
An appliance price is not the cost of a complete functioning ventilation system. The number and use of areas, routes, penetrations, acoustics and access affect the work. Replacing equipment also requires checking existing connections and distribution; old components are not automatically compatible.
Compare planning, supply, building work and commissioning with VAT clearly identified. A bathroom fan cannot be compared with ventilation for an entire dwelling. A general Swiss average without a defined system scope would therefore offer little help.
Running costs include electricity in the intended operating modes, filters and agreed maintenance. Clarify who supplies replacement filters and which care tasks you can perform following instruction. A maintenance contract, subsidy or certification is not automatically included in every quote.
| Comparison point | What to specify clearly |
|---|---|
| Planning | Areas served, concept and included checks. |
| Equipment and distribution | Appliances, ducts, terminals and necessary sound attenuation. |
| Building work | Penetrations, electrics, coverings and reinstatement. |
| Commissioning | Balancing, airflow checks, record and operating guidance. |
| Operation and care | Filters, access, consumption and separately agreed service. |
Key information for a suitable quote
State the known rooms and desired scope. A first request does not need measured airflow or a standard category chosen by the customer.
- Order. Distinguish a new building, retrofit, replacement and initial advice.
- Use. Describe the flat, house or actual business activity.
- Areas. State desired rooms, approximate floor area and the number of dwellings involved.
- Existing system. For replacement, share known equipment and documents where available.
From air-exchange requirements to a balanced system
An installation-ready solution develops from requirements and building possibilities. Routine care or fault repair of an existing system is a separate service order.
- Establish requirements. Define use and the areas to be served together.
- Assess the concept. Have air routes, installation and interaction with other equipment checked.
- Compare quotes. Check the complete scope, exclusions and future care.
- Install and hand over. Agree installation, professional balancing and understandable instructions.
Frequently asked questions
Can ventilation be retrofitted?
Yes, you can request retrofitting. Whether a central, decentralised or other arrangement makes sense depends on the building and possible intervention. Existing routes, façade and electrical supply should be checked before purchase.
Do I have to state airflow myself?
No. Describe use and the desired areas. The professional sizes the airflow and appropriate system and adjusts settings during commissioning.
Can I open windows with a ventilation system?
Generally, windows can still be opened. The system is planned for particular operating conditions; frequent prolonged opening can alter the intended energy and comfort effect. Ask for suitable everyday guidance.
Does ventilation cool rooms in summer?
Not automatically. Air exchange, heat recovery and active cooling are different functions. A bypass can help under suitable conditions but does not replace agreed cooling capacity. Desired cooling should be expressly planned.
Is complete duct cleaning included in installation?
Not automatically. Cleanliness during installation and commissioning, later filter care and thorough network cleaning are different services. Clarify the scope and access for future maintenance.
Is buying a new appliance enough for replacement?
Not necessarily. Connections, controls, distribution and sizing need to suit the replacement. Assessment and subsequent balancing help establish the agreed operation with the new equipment.
