They can easily jump 24"+ high by 2 weeks, so good to know you have a cover ready to go.
Also just to make sure it's clear, you do NOT want ambient temperature at 90-95. The only thing that needs to be that warm is the brooding plate, which you can confirm with physical touch - if it feels plenty warm to somewhat hot (but not burning hot) then it's just fine for the chicks.
I raise chicks outside with ambient lows around mid 40s (some folks here do even cooler temperatures). I put them under the heating pad (blue item on left side) so they learn immediately that that is where to go to warm up, but the rest of the time they're fine running about in the cooler space.
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