The chicks will let you know if they aren't happy. They will go in and warm up and then run out and back in.
After they warm up from transport, and are cheeping normal, I usually have to put it at medium.
If they stay under crying they are cold and if thier backs touch it needs to be turned up...
I use the pillow case so they don't get between the pad and wire. Several people had suicide by getting stuck. Zipped up pillow case leaves no room to wiggle in.
They get the warmth from contact, like a broody hen. So temp is lower than a light bulb heating the area. There's a post way back with...
Newspaper is slick and can cause leg problems. I put paper towels over the shavings for the first week. Actually I use pine pellets now days.
Low enough that it touches the chicks backs and raise as needed
I have put it on a deep layer of bedding... covered with a paper towel for the first week. They tend to dig out the bedding under it and have more hight.
I will look for pics later but I don't think I have any. Different phone and computer so I think I lost them. But I need to get it ready just in case.
Actually for adjusting, at first I sink it in the bedding and then remove the bedding inside as they grow until I need to arch it more. But by...
I arch the hwc, put it upside down, put the pad on the inside. Slide a travel size zipped pillow case over the whole thing with the cord so it's zipped up and sticking out. Then I put 2 bungies to hold it together. Flip and put it the brooder. I put a towel on top hanging part way down.
Chicks that were hatched in an incubator, have a low exposure to diseases. Chicks that were hatched under a broody would have been exposed and should be quarantined