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What in the world is a swamp cooler?Make sure you know what the lower limit of your hygrometer is. Many of the cheaper models will only read down to 20% humidity no matter how low the humidity actually is. My house gets below 10% humidity during the winter and the cheap hygrometers that I have still read the humidity as 20%. It is possible to drive the humidity down to 0% in an incubator without adding water in a dry climate.
Once I turn the swamp cooler on, the house humidity gets to be around 50%. At that time I run the incubator without adding any water. Before I turn on the swamp cooler, I have to add water to the incubator to keep it from becoming too dry.