Onomatopeia are not added to texts, but the action is described through words. You see, panting is voiceless, so is wheezing. Laughing, chuckling, giggling are not, since your *voice* comes out as HAHAHA. Deep breaths and sighs are also voiced, since you make a sound other than air leaving your lungs.
That is an action, not part of dialogue. If, for example, your character is wheezing so loud they make a sound that could be put in " ", then sure.
Gorthorax the Great burst in a fit of giggles that soon turned into wheezing as your wand malfunctioned, leaving you unable to cast any spell for the remainder of the night.
"That... hoo... sucks!" Gorthorax the Great managed to say between sharp gulps of air.