HollowOfWisps
Previously AstroDuck
You mentioned your chicks are three weeks old. 80 degrees could be used at the warmest spot, but they would need cooler places as well. 85-90 would be the temp used for day old chicks. They are too hot.
Personally I would not use heat with 3 week old chicks in the summer.
Turn off the lamp.
I agree with both of them just turn it off. I missed the three week part.