Moisture (humidity) and electronics plus wood (particularly MDF or chipboard) are not a good mix.

If there is anyway you can run the machines on a separate circuit as mentioned above, it would be a big help and solve the tripping breakers issue.

If the machines aren't being used then there is no need to have them running, all you will do is wear things out like displays and globes/bulbs quicker. If you have friends over or something like that for the night then leave the machines on but don't leave them on just for the sake of it.