I agree with Tresses on the part where they don't "go inside".
I returned to NJ back in May of 2011 for my Aunt's funeral. The funeral home that handled it has been in operation for 5 generations now with the same family (as well as being long time friends of my family). Oddly, its also the funeral home that handled the final arrangements for my father when I was 10 and my grandmother back in 2000; as well as numerous friends over the years.
The only time I had severe difficulty going in was when I was 16 - Michelle, a girl, the same age as my brother (who is younger by 2 1/2 years) had shot herself with her brother-in-law's service revolver. However, despite the coaxing of her older brother (10 years older than me), I could not go in to the actual parlor where she was laid out for visitation, much less the building. I was so inundated with anger, remorse, and sadness that I felt like I was suffocating. She (Michelle) was there,and was still in agony and pain. Thus I stayed outside on the wrap-around porch of the funeral home. Michelle was not in the same circle of friends that I had, and thus, aside from church on Sundays, I never saw her ... so really had no clue what her "demons" were that caused her to take her own life. A boy, a few weeks later, who was a year ahead of me in school took his own life (no tie ins between the two for suicides as we attended a different school than Michelle). Again, I couldn't enter due to the same overwhelming emotions. The end result between both was that I was extremely drained before even leaving to go home.
In May when I returned, I was expected to be inside - partly because it was family... and to help receive people coming in to pay their respects. But the atmosphere inside and out was actually quiet for a change through the majority of the place. It wasn't until at one point when I needed to use the rest room and I was escorted back to a private bathroom. It was actually near the stair case that led downstairs to the prep room. Only then did I feel any type of heaviness.
Death doesn't scare me. I welcome it as it is the next step in all of our journeys. And, the emotions that can be picked up on do not scare me either. While some of it can be upsetting or distressing, I know that the spirit is not attached to the vessel that once carried it. Regardless of whether it is a free soul or not.