I'm sure they wouldn't mind the fresh air...
Just make sure the cage is shaded from the sun (or not in the sun too long), make sure there's a area in the cage where the snakes could go to incase they are in the sun and want out.
As well as a decent sized water bowl (more like a swimming pool), and plenty of food and they should be alright.
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Mike
KingPin Reptiles
www.kingpinreptiles.com