Increasing the heating setting by 1 degree Celsius increases heating costs by 13%

November 24st
Often in lectures
"If you raise the heating setting temperature by 1 degree Celsius, the heating energy (heating costs) will increase by 13 to 15%! So if you raise the temperature by 4 degrees Celsius, your heating costs will increase by about 1.5 times!"
I have been telling you this.
I was telling him this because no matter what software you use for simulation, there will be roughly this much difference, but there was one thing that I personally had doubts about.
For example, if you raise the temperature from 20°C to 21°C, the difference is XNUMX%.
Why is there such a big difference in heating load?
If you think about it carefully, it seems obvious, but I have never explored the question in depth.
If you think about it carefully, it was simple.
Roughly speaking, heating costs are determined by the area multiplied by the heating period and the temperature difference between inside and outside.
First, regarding the temperature difference, when looking at annual heating costs it would be a big mistake to simply compare 20°C with 21°C; it is necessary to compare it with the average natural room temperature during the heating period.
For example, if this is 7°C and it is 20°C, the difference is 13°C.
In the case of 21°C, the difference is 14°C, so the ratio is 14÷13＝1.076, which is a difference of 7.6%.
The greater the temperature difference, the longer the heating period will be. To simplify, if we assume that the heating period will be extended by the temperature ratio, then 1.076 squared = 1.157.
It seems that the figure that comes out is a 15% increase.
If you understand this principle, you will also understand that the rise in temperature when raising the temperature from 21°C to 22°C is less than when raising the temperature from 20°C to 21°C.
Conversely, we can see that when heating at a lower temperature, a difference of 1 degree Celsius leads to a greater increase in heating energy consumption.