Nyrkorey

So I have my corn snake still a juvenile, he is such a good snake. So he is in a 75 gallon tank. There is a lip that runs along the top of the tank, since it was a old fish tank thats where the lids would go. So I have a screen cover that covers the tank, so recently he has been climbing up the thermometer cords and laying across that little lip on top of the tank , just hanging out all day, he isn't stuck he just likes laying there, its right by his ceramic heat lamp, now my question is, should I maybe block that off so he can't get up there and I was thinking maybe he is going up there to get closer to the heat, but his temp down low is around 81-82 degrees is that too cold maybe for him, or is this just a snake behavior where he feels secure up top and press up against the lip, bc it feels like a confined space, when I go up to him up there he isn't stress out looking he sees me and he is just hanging out doing his thing, just wondering about this. Maybe some insight on whats going on.