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Lowering the heating at night: sensible or not
Lowering the heating at night: sensible or not

Video: Lowering the heating at night: sensible or not

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If you want to use the nightly lowering of the heating for your house, you should first carefully inform yourself. Because whether it makes sense to lower the room temperature overnight depends on many factors. DAS HAUS explains who the night heating system works for and what conditions your building should meet.

Table of contents Table of contents Lowering the heating at night: sensible or not?

  • How does night setback work?
  • When is it worthwhile to lower the heating at night?
  • Does the night lowering favor mold?
  • Lowering the heating at night: The most important thing at a glance

Table of contents Table of contents Lowering the heating at night: sensible or not?

  • How does night setback work?
  • When is it worthwhile to lower the heating at night?
  • Does the night lowering favor mold?
  • Lowering the heating at night: The most important thing at a glance

Whether the nightly lowering of the heating makes sense for you depends on the construction and type of your heating. On the other hand, the insulation or the built-in windows can reduce or even reverse the positive effect of the night reduction. If it is often worthwhile to shut down the heating in old buildings, new buildings with their good thermal insulation are usually not suitable for night cooling.

Altbau Heizung
Altbau Heizung

While night-time lowering makes sense in old buildings, it is hardly worth it because of the good thermal insulation in new buildings.

Photo: iStock / CynthiaAnnF

How does night setback work?

When it comes to saving energy, heating and the resulting energy costs quickly become the focus of homeowners. After all, why should the rooms be fully heated if the residents don't come home after 5 p.m. or if everyone sleeps at night? During the night setback, the temperature of the building is reduced via the heating system. From a freely chosen time, for example 11 p.m. when everyone is asleep, the heating shuts down. You save energy costs while you sleep by simply programming the heating system. Even those who live in an apartment for rent can use the nightly reduction of the heating. To do this, manually set the individual radiator thermostats to the desired temperature.

Unfortunately, lowering the heating at night also has certain disadvantages: the next morning, before everyone gets up, the desired room temperature has to be raised again. This means that more energy may be required than if the room temperature had remained the same overnight.

It is therefore important to assess the overall situation of the building. Not only the size of the house plays a role here. The flexibility of the heating system, the insulation, but also the weather and the temperatures also come into play. Ask your heating expert for individual advice.

When is it worthwhile to lower the heating at night?

A good rule of thumb for night reduction: the better the thermal insulation of a house and the more solid the construction, the less the positive effect of the night reduction can be used. In recent years, more and more buildings have been built in a particularly energy-efficient manner. In such a low-energy house, the room temperature drops only slightly due to the good insulation during the night setback. This also means that the savings are very small. Even surface heating systems, such as underfloor heating, are not suitable for night-time lowering because they react only slowly to the changed setting.

In poorly insulated buildings, such as old buildings, the heat is lost relatively quickly and cannot be stored. This means that more energy is required to keep the room permanently warm than with well-insulated buildings. This is also the reason why owners of old buildings save more by heating the night than new owners - usually between five and ten percent. Due to the lack of or poorer insulation, old buildings cool down more strongly overnight and must be heated up again with more energy the next morning. Compared to the long night setback, the short heating-up phase can really pay off here.

Thermostat
Thermostat

In new buildings, the temperature can be easily controlled with a thermostat.

Photo: iStock / RossHelen

Good to know: If the winter gets milder, home owners can save heating costs anyway. The effect of the night setback is then hardly noticeable. The day and night rhythm of the house occupants also plays a major role, because the length of the possible night reduction is decisive for energy savings.

Does the night lowering favor mold?

When lowering the night, you must make sure that the dew point temperature is not fallen below at night. A continuous room temperature of at least 16 degrees Celsius is recommended. By lowering the room temperature, poorly insulated outer walls tend to cool down quickly. The warm room air contains more moisture than cold air. The humidity of the rooms can condense on cool window panes and walls, which can quickly lead to mold.

Image
Image

If the temperature drops below the so-called dew point, more moisture is created, which can lead to mold on the walls.

Photo: iStock / wabeno

Lowering the heating at night: The most important thing at a glance

  • If necessary, check with an expert whether your building is suitable for night lowering. From heating to insulation to construction, there are many factors that need to be taken into account.
  • Consider the lifestyle of everyone living in the building in advance. Can a night reduction be maintained over a longer period of time or is a day reduction possibly more sensible when everyone is out of the house? There are smart heating controls for this that regulate the heating individually.
  • Rethink the risk of mold in your building, as night-time lowering can favor it. Condensation on the windows is a sign of high humidity, which also favors mold growth. Tip: With a hygrometer to monitor the air humidity, which also shows the room temperature, you can keep an eye on the risk of mold.
  • If you decide to lower the temperature at night, make sure that the room temperature does not drop below 16 degrees Celsius even at night.

Carolin Haist

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