Chicks Dying- Need advice

[so lucky]

Welcome, and I am so sorry you are having these problems. I am kind of grasping at straws here, but could it be something in the air in your house? Do you have gas appliances, where there could be a gas leak or an exhaust problem? Automatic air fresheners that may have harsh chemicals? Do you cook in a Teflon coated skillet?
Do you have the chicks in a room where other activity is going on? Crafts involving glue, solvents, paint or other chemicals?
I hope you find the problem, as this is very distressing for all of you.

 

[Shadrach]

I would suggest you treat them for coccidiosis. It won't do any harm if this isn't what is causing their deaths and very often this is what kills young chicks. Often you don't get much warning.
Even if you've fed medicated feed it's no guarantee that they wont pick coccidia up.
If this doesn't work then you will at least have ruled one thing out.

 

[Shamo Hybrid]

I'm with you on that. I start mine at 98 for a week, then 88 for a week, then 78 for a week. Then I let it get to about 70 and leave it at that. And all that is in one end of the bin, the other end is always about 10 degrees cooler. I don't stop using the heat lamp because my chicks aren't in the house. I raise them in the garage. Sounds to me like OP's keeping them a bit too warm, but I wouldn't think that would be causing the deaths.

She's a first time chicken keeper so I just hope she doesn't cover the whole brooding area with 90 degree heat! They need a cool spot to escape. If you are reading this OP, you have to leave an area unheated so they can choose whether to go get some heat at the heating source or go cool down in another part of the area!

If I had to guess, I would say she sadly overcooked her chicks!

 

[goldies99]

your not using cedar chips in the bedding ..are you???...that isnt good for chickens....