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I have tried to find a comparison on energy consumption between 95 and 95+45 mm insulation in a shed that should be able to maintain 20 degrees. But haven't found anything... everything just says that 95 is sufficient.

But is there any rule of thumb on what the difference might be in annual energy consumption?
Anyone have tips?
 
Technically, energy loss is linearly dependent on the insulation thickness, so 140 mm reduces consumption by about 50% compared to 90 mm. However, that only applies to the specific construction element, and in practice, there are other factors that come into play. The total energy consumption depends on the type and size of windows and doors, roof insulation, ventilation, etc.

In a simplified way, one might estimate that a somewhat poorly insulated house uses a little over 150 kWh per square meter per year, so if the size is 15 square meters, the total energy consumption should not be more than 2500-3000 kWh per year. But if anyone has personal experience, they are welcome to verify the figures.
 
Compare the U-value for each wall, U-value has the unit W/m²*K, which means that if a wall has a U-value of 1, one watt is needed to keep the temperature one degree higher than outside.
 
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Yeah, I know everything that can be counted exactly, and have done calculations, but thought if there was someone who had seen a simple template. I will be heating with geothermal, so not much there, but since the outer dimensions are limited, thicker walls directly negatively affect the inner space...

But at the same time, it's foolish to have too thin insulation... I think it should be possible to have 20 degrees when needed, but normally it will just be a storage space... but who knows in the future.

Then there's the question of whether to have the 45 on the outside or as an installation layer on the inside, but maybe it's not close to ideal to have the humidity barrier on 45 of 140.
 
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