At this age, and still living indoors... you can definitely turn off the heat lamp! With those room temps plus a heat lamp it would be very easy to overheat them.They are in a cage in my family room, and the temp is in the upper 60's at night, and a little warmer during the day. When can I stop the heat lamp?
for me the answer seems to be when the chicks tell me they're through w/the heat lamp. mine are in an extra large dog crate w/cardboard around the sides in their sleeping area only. it is in a barn type structure w/a 'chicken corral' outside. it has been chilly today so I left the heat lamp on over their favorite sleeping spot. they ranged in & out all day. it was as though the cold was fine as long as they could go to a spot & warm up. tonight we're having record lows, the heat lamps will be on all night in their sleep den, but there's always room for them to move to a cooler spot. mine are largely feathered out & have far greater tolerance for the cold than in the earlier days.
since I've made a few changes, I can't readily see the thermometer anymore, so I just rely on how they're behaving
At this age, and still living indoors... you can definitely turn off the heat lamp! With those room temps plus a heat lamp it would be very easy to overheat them.