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Warmth and fresh air

Save heating costs with ventilation

Nationwide measures are to reduce electricity and heating costs in public buildings, for example by heating rooms to only 19 degrees. Do we now have to freeze at home to save on heating costs for the winter? Fortunately not!  – If you ventilate and heat properly, you don’t have to freeze and you can still save money and protect the environment. We provide you with valuable tips on how to ventilate your flat or house in an energy-efficient way and thus save on heating costs.

Why ventilate in winter?

Sparen durch richtiges Lüften
Even in winter, regular ventilation is essential for a healthy living climate and the prevention of mould. Both moisture and pollutants such as dust particles or volatile organic compounds (VOCs) accumulate during the course of the day and would harm health without regular air exchange. Moisture damage caused by mould growth is also the result of insufficient ventilation. To ensure that you can continue to achieve your comfortable temperature in winter and still save costs, you need the right balance of ventilation and heating.

Did you know?

1 degree less heating means approx. 5% heating cost saving

Correct ventilation

How you can save heating costs through proper ventilation and also prevent mould growth:

Shock ventilation instead of tilting

Öffnen Sie in einem Raum das komplette Fenster und schließen Sie die Tür. Hierbei zirkuliert die Luft innerhalb eines Raumes und die Luft kann optimal ausgetauscht werden. Vermeiden Sie es, dauerhaft das Fenster zu kippen, da hierbei die Wände auskühlen und so anfälliger für Schimmelbildung sind. Wichtig: Temperatur der Heizung beim Lüften absenken!

Cross ventilation

Open the window in several (preferably opposite) rooms and open all doors. This allows the air to circulate between several rooms. However, you can also carry out cross-ventilation with a tilted window if you pay attention to the duration. Important: Lower the temperature of the heating!
Richtig Lüften spart Heizkosten

Did you know?

The walls and objects release the stored heat back into the room after ventilation. The fresh air contains less moisture and therefore warms up faster.

Regular ventilation

If you are out all day, it is sufficient to air the apartment in the morning and in the evening. Otherwise, for hygienic reasons, it is recommended to completely exchange the air at least three to four times a day. You should always ventilate the kitchen and bathroom when large amounts of water vapor have formed zum Example after cooking or bathing.


Air 3 times a day for 3-5 minutes

Spring / Autumn

Air 4 times a day for about 10 minutes


Air in the morning and evening for 25 minutes

Economical heating

Richtiges Heizen spart Heizkosten

Maintain the optimal room temperatures

Just one degree Celsius less saves around 5% on heating costs. Therefore, the living rooms should be heated according to their purpose. 18 degrees Celsius are sufficient in the hallway, bedroom and kitchen. At 20 degrees, the living area and study have the optimal temperature. In the children’s room and bathroom it can also be a little warmer at 22 degrees Celsius. Thermostats help them to keep the right temperature.

Make sure that unused rooms are kept at a minimum temperature of 14 degrees and that the doors of heated rooms remain closed to prevent mold growth.

Pay attention to free radiators

Do not place any furniture in front of the radiators so that the warm air can be optimally distributed in the room. Also, do not put wet clothes on the radiator. It is better to dry your laundry on a drying rack.

Bleed your radiator so that unnecessary air escapes and the radiator can heat up to the set temperature faster. All you need is a radiator key, a container to collect the heating water and a rag.

Turn down heating instead of turning off

Don’t turn the heating off completely overnight or when you’re away, as it’s more expensive to reheat a cool room. Better keep the average temperature lowered to 16-18 degrees Celsius and turn the heating down.

Did you know?

Saving heating costs is easy on your wallet and environmentally friendly at the same time: with the right method, you reduce CO₂ emissions.

Energy-efficient ventilation and lower heating costs

Decentralized ventilation systems with heat recovery ensure continuous fresh air indoors and can reuse up to 94% of the exhaust air heat with the ceramic heat accumulator. The ceramic core stores the heat of the interior air when exchanging the used air and gives it off to the fresh air flowing in from the outside. As a rule, the living room air is completely exchanged every 2 hours. The strength of the ventilation adapts to the individual needs of the residents.
You can get fresh and warm air into your rooms without having to open the window all the time.

Why is a decentralized ventilation system with heat recovery worthwhile?

No draught

Unlike open windows, decentralised ventilation provides a continuous exchange of air. This avoids strong draughts in the flat.

Fresh air without cooling the rooms

If the windows are open too long or permanently tilted, this causes the walls to cool down. As a result, more heating energy must be used to warm up the rooms again. Ventilation with heat recovery guarantees fresh and warm air without cooling down the flat.

Save heating costs

Mit unserer dezentralen Lüftungsanlage mit Wärmerückgewinnung können bis zu 1/3 der Heizkosten gespart werden. Die Wärme der Innenluft wird beim Abziehen dieser im Keramikspeicher gespeichert und an die einströmende Frischluft abgegeben. Die Wärme bliebt im Gebäude und die Heizung wird entlastet.

Low power consumption

The Xenion fan requires only 0.15 W/(m³/h). Depending on the electricity provider and the utilisation of the ventilation units, electricity costs are approx. 5-7 euros per year per ventilation unit.

Environmental friendliness

A ventilation system not only has low power consumption, but can also save up to 1/3 of the heating costs. Resources are conserved, which means that CO₂ emissions can be reduced. The ventilation system is an elementary step in the energetic renovation of houses.

Frequently asked questions about ventilation and heating

Fragen zu richtig Lüften und Heizkosten sparen

Why does ventilation save on heating costs?

In contrast to tilted windows, intermittent ventilation saves energy and at the same time helps to prevent mold growth.

How do you save the most heating costs?

Through a good balance between ventilation and heating. Regular airing is best instead of leaving the windows open all the time. Furthermore, the heating should not be switched off completely at night and when you are away, but only turned down.

What happens if rooms are not heated?

Mold can quickly form in rooms that are never properly heated. Moisture can get into the permanently cold room through open doors of heated rooms and thus condense the moisture on the cold walls.

Our tip to save heating costs with ventilation:

At the federal level, individual measures such as ventilation with heat recovery for existing buildings can be funded within the framework of the BEG in Germany. Read more about it here:

Interested? Request planning support now!

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