If the cakes are cold when you cover them, condensation can form and cause the "sweaty fondant". You can either wait for it to dry and then decorate, or put a fan near it to help it dry faster.
Keeping the cake at room temperature will eliminate condensation completely.
There are ways to cool the cake and bring it back out without condensation forming, such as putting the cake in a box and sealing it. If you leave it in the sealed box as it comes to room temperature, the condensation will form on the box and not the cake.
But if there is nothing perishable in your cake then there's nothing wrong with leaving it at room temperature.
what fondant r u using??? I went to Puerto Rico to visit my mom and made MMF there... well with how hot it's there and the humidity.... I tell ya.... the MMF was sweating a lot and there was nothing I could do to chnge that... the cake was at room temp... so It wasn't the cake.... so I asked a few cakesters in PR.... and they don't use MMF at all... it doesn't work well in PR..... they have another recipe they use for their fondant.... so.... I don' tknow.... it might be that.... you should ask around in your area.... maybe there is an "area" trick that solves that problem.... good luck
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