When it's cold outside, runs away from the apartment.
If you can afford it, you can invest in aluminum shutters filled with special foam that keep heat in the apartment, and in the summer not allowed to it of hot air.
Also, close the front door, especially if you live in an older unit.
How to save on heating: ventilate briefly, but intensively
On cold days, open widely the window, but only for 5 minutes, because then the heat loss will be less.
However, the heating is switched off when you have modern thermostats, does not make sense, because these devices adjust to the sudden change of temperature, and starts working with full force.
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