80-90 is far too hot for them, especially if they are in a rack. They can only sweat through their tails and feet and can overheat very easily. Please either consider rehoming or finding a way to reduce the smell inside. Are you providing them with adequate space and ventilation as well as cleaning reguarly and feeding a high-quality diet? All of those will affect the level of odor you notice.
I keep my 13 pet rats in my bedroom and I've never had a single visitor to my room notice a smell. Rats kept properly do not stink.
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