Ventilation systems for houses and apartments
Efficient solutions for your home
ventilation systemsWhether in your house or apartment, Lossnay ventilation systems ensure that the air quality in your home remains consistently high—with heat recovery and without drafts. The intelligent technology removes stale air, filters out pollutants, and supplies fresh, preheated air. This is particularly important in modern, well-insulated buildings to prevent mold growth, odors, and poor air quality – with integrated heat recovery.
Fresh air is also becoming a legal requirement: the German Building Energy Act (GEG) stipulates that new buildings and renovations must have a ventilation concept in accordance with DIN 1946-6 if more than a third of the windows are replaced or major insulation measures are carried out. Lossnay can be planned as part of a ventilation concept in accordance with DIN 1946-6.
Your advantages at a glance:
- Automatic fresh air supply – without opening windows
- Ventilation concept in accordance with DIN 1946-6
- Integrated heat recovery saves heating costs
- Ideal for allergy sufferers: filters against fine dust, pollen, etc.
- Extremely quiet – also suitable for bedrooms
- Easy to retrofit, even in older buildings
- For apartments, individual rooms, or entire houses
Ventilation systems with heat recovery
Ventilation systems & heat recoveryFresh air with heat recovery
A common problem with ventilation: valuable heating energy escapes along with the stale air. This results in higher heating costs and an uncomfortable indoor climate. This is exactly where Lossnay heat recovery comes in.
Here's how it works:
- The warm exhaust air from the interior is removed by the ventilation unit.
- In a special cross-counterflow heat exchanger, the heat contained is transferred to the fresh supply air.
- The fresh air enters the living space preheated after heat transfer from the exhaust air.
- Odors, moisture, and pollutants are kept outside—or safely removed.
Your advantages at a glance:
- Heat recovery in central systems; model-specific values are available in the product information
- Noticeable savings on heating costs – especially during the cold season
- Comfortable indoor climate without drafts or temperature fluctuations
- Heat recovery transfers heat from exhaust air to incoming supply air
The Lossnay units described here are equipped with heat recovery; the systems transfer heat from exhaust air to incoming supply air and support living comfort.
Central or decentral ventilation system?
Centralized or decentralized?The choice is yours!
Every home is different – which is why Lossnay offers two well-designed system variants. Whether you want to supply fresh air to an entire new-build single-family home or retrofit individual rooms in an existing building, you will always find the right solution with central and decentral ventilation systems – quiet and comfortable.
Central ventilation systems:
Central ventilationFor new buildings or comprehensive renovations
The Lossnay VL-250/350/500 system supplies your entire home with fresh air evenly. The central ventilation unit is usually installed in the utility room, and the air is distributed via a pipe system.
Your advantages:
- Air flow rate up to 500 m³/h
- Heat recovery; model-specific values are available in the product information
- Control via sensors (e.g., CO₂, humidity) possible
- Integration into MELCloud building control system
- Various filter options – including NO₂ filters
Lossnay VL-500 central ventilation system
Decentral ventilation systems:
Decentralized ventilationIdeal for individual rooms and retrofits
The compact VL-80 is perfect for supplying fresh air to individual rooms such as bedrooms, living rooms, or even kitchens.
Your advantages:
- Easy installation with just one core drilling
- Extremely quiet (only 25 dB(A) at the lowest setting)
- Heat recovery; model-specific efficiency values are available in the product information
- Operation via pull cord or switch
- Optionally available with coarse or fine dust filter
VL-80 decentralized ventilation system
Understanding and utilizing funding
promotionSecure up to 20% subsidy for your ventilation system
The federal government actively supports private homeowners in making their buildings more energy efficient with the Federal Subsidy for Efficient Buildings (BEG). You can also benefit from this if you choose a Lossnay ventilation system with heat recovery.
When is funding possible?
- You are modernizing your house or planning a new build
- You use controlled residential ventilation with heat recovery.
- The measure meets the minimum technical requirements according to the BEG.
How much is the subsidy?
- Up to 20% of the investment costs can be covered by a direct subsidy from the government.
- In combination with other measures (e.g., insulation, heating replacement), even higher subsidies are possible.
What do I need to bear in mind?
- Always submit your application before implementation (e.g., before purchasing or starting construction).
- Planning and implementation by specialist companies
- Documentation of technical requirements
Lossnay meets the requirements
Lossnay units with heat recovery—whether central or decentralized—must be assessed against the BEG requirements for the specific project.
Tip: Seek advice from a certified specialist partner—they will also help you with the application process.
Combining a ventilation system with a heat pump
Ventilation system & heat pumpCoordinated ventilation, heating, and cooling
The combination of a ventilation system with heat recovery and an Ecodan heat pump is a coordinated solution for modern, comfortable living.
Why this combination is so effective:
- Heat recovery: The ventilation system transfers heat from the exhaust air to the incoming supply air and supports the heat pump in space heating.
- Uniform air distribution: Controlled distribution of room heat without drafts—ideal for comfort throughout the house.
- Better air quality: Pollutants, CO₂, and moisture are automatically removed, and preheated fresh air flows into the house.
- Cooling included: Ecodan heat pumps can also provide gentle cooling when designed accordingly—e.g., via surface heating. The ventilation system supports a stable indoor climate.
Tip: A well-designed combination of ventilation and heat pump can not only have a positive effect on your electricity bill, but also on the subsidy amount!
Why Lossnay?
Why Lossnay?Sophisticated technology makes all the difference
- Integrated heat recovery—saves heating costs and provides preheated fresh air
- Extremely quiet operation – whisper quiet at only 15–25 dB(A), ideal for living rooms and bedrooms
- Flexible systems – central and decentral devices for new buildings and retrofitting
- Easy installation – e.g., VL-80 with only two core holes for supply and exhaust air, no ventilation pipes required
- Intelligent filter technology – protects against pollen, fine dust, and optionally even nitrogen oxides
- Low power consumption – from approx. 6.5 watts during operation
- Needs-based control – via switch, pull cord, or optional sensors (e.g., CO₂, humidity)
- MELCloud connection possible – for central control via app or smart home
- Easy maintenance – easily accessible filters, quick replacement without tools, and permanently hygienic operation
With Lossnay, you can rely on proven Mitsubishi Electric quality - for greater comfort and a healthy indoor climate in every room.
Ventilation systems FAQs
Ventilation systems FAQsControlled residential ventilation, or CRV for short, refers to the principle behind modern ventilation systems: a mechanical system continuously supplies fresh, filtered air and removes humid/stale air.
- Centralized residential ventilation: The entire house is supplied via an air distribution system. This is particularly suitable for new buildings or comprehensive renovations.
- Decentralized residential ventilation: The systems are installed directly in individual rooms and are ideal for retrofitting in existing buildings. They require two core holes and can be controlled independently of each other.
The Building Energy Act (GEG) does notspecify a particular system, but it does require a ventilation concept in accordance with DIN 1946-6 for certain modernization projects (e.g., if more than one-third of the windows are being replaced). A ventilation system is often a convenient way to ensure the required air exchange.
Yes. Decentralized systems in particular are very well suited for retrofitting in older buildings, as they can be installed with minimal effort—usually all that is required is a hole through the exterior wall.
In heat recovery, the system transfers heat from the exhaust air to the incoming freshair—without mixing the air flows. In central Lossnay systems, model-specific heat recovery values are available in the product information. The heat transfer supports a consistent, comfortable indoor climate, especially in winter.
Modern devices require very little power: the Lossnay VL-80 consumes around 6.5 W on the low setting—roughly equivalent to the power consumption of a smartphone charger. Overall energy use depends on the device, settings, building, and ventilation behavior.
High-quality devices operate very quietly—often below 25 dB(A) at low settings. This means they are barely noticeable even in bedrooms or children's rooms.
By comparison, the sound of rustling leaves is around 20 dB(A), while a refrigerator is around 50 dB(A).
Yes. The ventilation system provides basic ventilation, and you can still open the windows as needed (intermittent ventilation). However, permanently tilted windows reduce the efficiency of heat recovery.