Cavies in the classroom
Many people believe guinea pigs and classrooms don’t mix. The best arrangement is a pair of same-sex cavies that are the teacher’s personal pets, returning home with her at the end of the day, or at least, the end of the week. Intermittent visits to the classroom are preferable to day trips and special occasions. Check with the Building engineer to find out the hottest and coldest temperatures in the school at night. Sometimes they may be not be kept comfortable during off hours, at night.
It's also not a great idea for students to take them home on weekends because too many variables in a new location may stress them out and cause illness.
As long as they get special attention in the morning and at the end of the day they will make excellent weekday classroom pets. They should, of course, be in a pair and each has somewhere to hide if they want. Fresh Food and Water every day... and maybe even some soothing music if you feel like spoiling them.
Remember: Always wash your hands before (and after) picking up or petting guinea pigs.