My baby won't sleep in her crib. She will sleep in her swing, but after 2-3 nights of sleeping in her crib...?

she won't go back for more than an hour at a time. In all fairness, her room is not air conditioned, and ours is. Her window fan does cool the room down, but not below 70 degrees. Is it too soon to worry, or is it okay that she is sleeping in her swing. She slept 10.5 hours consecutively in her swing. For the 2-3 nights she slept in her crib, she did sllep 6.5 - 8 hours.