Dear All,
I modeled a building and I want to make a comparison with different materials, which have different U values, for external wall. But when I change U value, space heating load does not change as expected. For example, I tried to make a comparison between two materials, their U values are 1,2W/m2K and 0,2W/m2K, and the result shows that space heating load is reduced by only 8%. Is this result rational? or Is there something wrong?Thanks

Tugce