Depends on how much a hygrometer is, I probably wouldn't get one unless I'm noticing any problems. Thanks for the suggestion though, I'll have to keep it in mind.I painted the inside of my coop with a good exterior paint so that I would be better to clean. I didn’t want any of the wood to absorb smells, etc. But I agree with others about ventilation. Could you get a hygrometer and see what it is inside the coop vs outside?