Decentralised ventilation provides a single room in the house with fresh air. The ventilation unit is installed directly into the exterior wall of a bedroom, study etc. Existing heat or cold in the room is reused.

Also known as: Localised ventilation or decentratised heat recovery

Pros and cons:

+ No complete duct system required

+ Lower energy costs thanks to heat recovery

+ Better air quality and increased comfort thanks to the air filter

- Restricted to one room

- Exterior component required in the facade

For Overflow ventilation, the mechanical ventilation box is replaced with a heat recovery unit. This measures air quality and extracts polluted air via existing ducts. Fresh air is typically transported via supply ducts from the attic to the 1^st floor and then to the ground floor via the landing. Depending on the building layout, it can also be centrally supplied at a single point such as in the hallway.

Also known as: Overflow technology or overflow ventilation

Pros and cons:

+ Proven to deliver better air quality throughout the home

+ Fewer materials required

+ Lower energy bill compared to mechanical ventilation

- Somewhat slower effect compared to direct air supply

- Only works for renovation

A single unit ventilates the entire single family house or flat. Air is supplied to and extracted from the right areas via an air distribution system. Existing heat or cold in the home is reused. This maintains a pleasant indoor temperature and saves energy.

Also known as: ClimateSwitch, total system or indoor climate solution

Pros and cons:

+ Direct supply, adequate fresh air everywhere in the house

+ Optimum comfort

+ Entirely automatic and works quickly

+ Suitable for new construction and area-focused ventilation

- No active cooling or heating

Climate system is ventilation, cooling and heating combined into one system. This is an expansion of a centralised heat recovery unit, which actively cools or heats the air supply. The system finds the balance between health, comfort and energy efficiency.

Also known as: ClimateSwitch, total system or indoor climate solution

Pros and cons:

+ Sustainable, healthy way to prevent overheating in the home

+ Maximum energy efficiency in any season

+ Additional comfort due to balanced humidity

- A climate solution has to be added to the ventilation unit,

taking up a bit more space

- Higher purchase costs