This is what I use and I never had that problem.

Long distance or long hours with me I use

Petsfit Bird Carrier Medium Size with Stainless Steel Bowl, Parrot Backpack Includes Slide Tray for Easy Cleaning, 13" x 10" x 16" https://a.co/d/dqAr2sH

Short trips I use this combine with the little fan

Bird Carrier Cage, Bird Travel... https://www.amazon.com/dp/B07W7H7VYR?ref=ppx_pop_mob_ap_share

My cockatiels never gave me problems with ether and my best pal lived in the former carrier for about 4 months when he was on the mend from a injury.

Bird Carrier Cage, Bird Travel Backpack with Stainless Steel Tray and Standing Perch https://www.amazon.com/dp/B07W7H7VYR/ref=cm_sw_r_apan_i_KDTPRRKTRJVNXQGZFF68?_encoding=UTF8&psc=1

Thats the one I bought from Amazon but this one also comes with a mini fan that attaches to the side of the mesh side which I need to get asap. That'll come in clutch when it gets really hot mid summer

edit the fan doesn't come included but there is a link to order it on that same page