Im in no way an expert at all n yes it does sound as though she is saying 'an seomar' but if you look at the rest of the sentence by my understanding is 'Tha' means the word 'is' is in the sentence so it couldn't read as the terribly warm bedroom as 'seo' is in the sentence so would be 'This' room 'is' terribly warm..
Please someone let me know if I am completely wrong so I can adjust my thinking :)
It definitely sounds as if the recording was cut in the wrong place. I never get it right in the first run. I may be wrong, but "this terribly warm room" would make sense, too. Therefore I would really appreciate a complete recording. Obviously it is not only me - I never trust my ears - but other learners as well who have this problem.