Hi!
Is their AC blasting straight at the cage? Are you living in a part of the US that has a dry/desert or rather a humid heat climate? Having the cage close to an air conditioning can cause URI; alternatively, the dry air from an AC unit can cause a runny nose.
Please have them vet checked. You can reclaim any vet cost from the pet shop that you incur because of illness because exposure and infection has likely happened at the shop. It may a bacterial respiratory infection, which requires an antibiotic.
Take the time to read these two guides here:
What to check and look out for in new guinea pigs (vet checks, sexing, parasites&illness)
Hot weather management and heat strokes
These guides are part of our new owners guide collection, in which we try to address the most commonly encountered issues by new owners.
Getting Started - New Owners' Most Helpful Guides
The collection also contains a link to recommended US vets.
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I’ve already put my location also they are close to my AC I will try to move them but here in NJ it is very humid and hot at the moment. I try to keep them cool with my AC if I don’t put in my AC there is not why they could survive in my room. Do you suggest I get a humidifier?