NO difference in Simulation Results when I changed the single glazed window to double glazed window

[EOMR]

Hello,
I am modelling a building that has no HVAC system. The building is naturally ventilated. I have several problems when I deal with building without HVAC system. Such as

1- When I tried to understand the different types of windows (single glazed- U-value=x, double glazed- U-value=y, triple glazed- U-value=z) on the indoor air temperature, I found that there is no difference!! Although I am sure that this type of window was applied to the model (I checked Apache -select the room- assign constructions).

2- Even, When I tried to add the HVAC system to the building also the air temperature does not change.

The model acts as it is blocked from any modifications

Any advice Please ..........As soon as possible
Thanks