[UPDATE] Based on the feedback from everyone I decided they were probably cold, so I put on a space heater in the room they're in and they're much quieter now and seem to like it. Just in case anyone goes searching and finds this later, that's what happened. 
I got some chicks two weeks ago, there are two that were about a week old and three that were a few days old. So now they are 2-3 weeks old (approximately). The larger ones have about half their feathers, and the smaller ones are just getting feathers at the shoulder part of their wings. The heat lamp burnt out and I didn't think to get a spare bulb, and with the pandemic going on I don't want to go to a store just for something so trivial.
They are indoors but the house is only about 65-70 degrees. I put some cat heating pads under the tote they're in but that doesn't seem to do much since I think that kind only works if the animal has its weight on the pad to trap the heat. I do have some oil-type space heaters that I could put in the room they're in, but I don't know if I should.
I guess my question is, do they still need more heat? According to the chart they do, but they seem pretty ok. Whenever I go to check on them they are eating, drinking, pooping, trying to fly, jumping on each other, or sleeping on an old towel bar I put in as a roost.
What will they look like if they are too cold? Should I put a heater or leave them alone?
Thanks!

I got some chicks two weeks ago, there are two that were about a week old and three that were a few days old. So now they are 2-3 weeks old (approximately). The larger ones have about half their feathers, and the smaller ones are just getting feathers at the shoulder part of their wings. The heat lamp burnt out and I didn't think to get a spare bulb, and with the pandemic going on I don't want to go to a store just for something so trivial.
They are indoors but the house is only about 65-70 degrees. I put some cat heating pads under the tote they're in but that doesn't seem to do much since I think that kind only works if the animal has its weight on the pad to trap the heat. I do have some oil-type space heaters that I could put in the room they're in, but I don't know if I should.
I guess my question is, do they still need more heat? According to the chart they do, but they seem pretty ok. Whenever I go to check on them they are eating, drinking, pooping, trying to fly, jumping on each other, or sleeping on an old towel bar I put in as a roost.
What will they look like if they are too cold? Should I put a heater or leave them alone?
Thanks!
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