Brick is not very good for insulation - typically an R-value of .2 per inch. At 3 feet (~1 meter), you're only at an R-value of ~7.2 - which you can get with 2

Brick is not very good for insulation - typically an R-value of .2 per inch. At 3 feet (~1 meter), you're only at an R-value of ~7.2 - which you can get with 2 inches of fiberglass. I don't doubt the building is cool in the summer and warm in the winter, but I suspect the reason is different than the brick walls.