Proper air distribution is critical for comfort, energy efficiency, and healthy indoor air. Unfortunately, this is also one of the most common areas where mistakes are made during installation. Ventilation should be designed so that fresh air mixes evenly with room air, without causing drafts or leaving parts of the room with poor ventilation.

• Key principles of good air distribution:
  Diffuser placement: Supply air diffusers should be positioned so that the airflow spreads widely and mixes before it reaches occupants. In living rooms and bedrooms, the air should not blow directly on people sitting or sleeping.
• Air velocity: Supply air should enter the room at the right speed — strong enough to spread and mix, but not so strong that it creates a noticeable draft in the occupied zone.
• Temperature difference: Slightly cooler supply air (typically 3–5 °C below room temperature in winter) helps mixing. If supply air is warmer than the room, it may rise and stay at the ceiling, leading to stratification and poor ventilation.
• Balance between rooms: Fresh air must be supplied where people spend time (living rooms, bedrooms) and extracted where pollutants and moisture are generated (kitchen, bathroom, WC). The airflow balance ensures proper circulation through the entire dwelling.

Common mistakes and misunderstandings:

• Diffusers placed too close to people → causes drafts, complaints, and users lowering ventilation unnecessarily.
• Using the wrong diffuser type → for example, simple grilles that blow air straight down instead of swirl or slot diffusers that spread air evenly.
• Too high supply air velocity → leads to noise and drafts.
• Too low supply air velocity → air “falls” before mixing, leaving parts of the room poorly ventilated.
• Placing supply and extract too close together → air short-circuits from supply to extract without mixing into the room.
• Not considering furniture layout → air blowing directly on a bed or sofa leads to discomfort.
• No adjustment after installation → dampers and diffusers should be balanced on site to ensure design airflow rates are achieved.

Why this matters:
If air distribution is wrong, occupants may complain about drafts, poor comfort, or “feeling cold air.” This often leads to users lowering or even turning off ventilation, which then compromises indoor air quality. Good diffuser selection and placement prevent these problems by making the airflow almost unnoticeable — you feel the comfort of fresh air, not the movement of air.

In short: ventilation should be felt as fresh and comfortable, not as moving or cold air. If you can feel the airflow directly, the diffuser type, position, or adjustment is probably not correct and should be reconsidered.

In heat recovery ventilation systems, the supply air is always a few degrees cooler than the room temperature after passing through the heat exchanger. This is normal and ensures the fresh air mixes evenly with the indoor air. Even distribution is critical for comfort: if supply air were hotter than the room, it could rise to the ceiling and stay there instead of spreading evenly, leading to poor air quality and uneven temperatures.

Some competitors use a postheater to warm the supply air to room temperature or above. While this can make the air feel warmer at the grille, it has drawbacks: higher energy use, extra cost, added complexity, and in many cases worse mixing because the warmer air tends to “stick” to the ceiling instead of reaching the occupied zone. Our approach avoids these issues by keeping the system efficient, simple, and safe — while still ensuring fresh air is distributed evenly and your heating system maintains the right room temperature.

It is also important that diffusers are chosen and placed correctly. The goal is that you do not feel a draft or moving air directly. If you ever feel airflow in the occupied zone, it usually means the diffuser type, location, or airflow settings need adjusting. In such cases, another diffuser design or placement should be considered to ensure the supply air spreads widely and mixes invisibly into the room.

Low humidity in winter is a natural result of the outdoor climate, heating, and ventilation. Cold outdoor air contains very little moisture. When this air enters your home and is heated to room temperature, its relative humidity drops sharply — for example, –5 °C outdoor air at 80% humidity becomes only about 20% once warmed to 21 °C indoors.

Your heating system also contributes to the effect. The more you heat the air, the lower its relative humidity becomes, because warm air can hold more moisture. That’s why rooms with higher setpoint temperatures often feel drier than cooler ones, even if the ventilation rate is the same.

Ventilation has its part too: while it ensures fresh and healthy indoor air, it also replaces moist indoor air with dry outdoor air. Everyday activities like cooking, showering, and even breathing generate humidity indoors, but the ventilation system removes part of this along with stale air.

To help maintain comfort, Airobot offers solutions:

• ERV Heat Exchanger: Unlike standard HRV units, the ERV version recovers not only heat but also a portion of the indoor humidity, reducing the drying effect.
• Central Steam Humidifier: For homes where humidity control is important, Airobot provides a steam-based humidifier that connects directly to the ventilation system. It adds moisture into the supply air ducts, ensuring even humidity across all rooms, automatically controlled by the ventilation unit.

In short, winter dryness is a combined effect of outdoor climate, heating, and ventilation. With the right technology — such as ERV exchangers and central humidification — your Airobot system helps keep humidity at a healthier, more comfortable level all year round.

Ventilation is designed to supply fresh air, not to actively cool your home. In summer, when it’s hot outside, the ventilation unit does not reduce the indoor temperature like an air conditioner would. Instead, its job is to keep air quality high by bringing in fresh air and removing stale air.

The summer bypass is a feature that improves comfort when outdoor air is cooler than indoors, typically in the evening or at night. In this mode, the unit bypasses the heat exchanger so the cooler outdoor air flows directly into the house without picking up heat from the outgoing air. This can provide a small cooling effect and help lower indoor temperature slightly, but it should not be confused with active cooling.

In short: the bypass makes the most of natural cooler air when available, but for real cooling of indoor temperature during hot days, an air conditioning or heat pump system is needed.