When I upgraded from a 1060 to a 3070 graphics card the heat output surprised me. I had to move it away from my legs so I wouldn't start sweating after 20 minutes under load. Made me rethink just getting the most powerful thing I can afford.
My office already has my computer, mini fridge, 35 inch TV, leopard gecko tank (145 watts during day, 45 watts at night), 3d printer in the closet, networking equipment, my NAS, and 6 or so low powered chargers and devices. plus mine and two dogs body heat. All in a 8' by 12' space. It gets warm. I like it during Michigan winter not so much during summer.