For ambient temperature, I'd say anything over 86F is too hot and below 76 is too cold. These aren't absolutes, but that's what I'd be comfortable with my BPs.
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The only reason I ask is because I'm getting screamed at for moving the babies inside because the hottest tank was at 98 with NO heating elements on and the lowest was 93. Now inside in totes with cool paper towels and misted to cool off