I'm a retired union sheet metal worker and have worked on residential "tract" homes, custom homes, hotels, Navy barracks, class rooms, and housing, banks, the Federal Reserve Bank, office buildings, churches, schools, strip malls, high end stores, restaurants, convention centers, landmarks, an opera house,factories, hospitals, and a nuclear power plant doing heating, ventilating, and A/C work. I'm sure I left out a few places also. A lot of my work was outside no matter what the temps were, may they be hot or freezing. Since I retired the construction trades have taken quite a "dive" and I happy I got out when I did.