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You will read from several sources that hatchability starts decreasing greatly after 7 days. However, when I set my eggs, I write the date on the top with a pencil, and you'd be surprised how many of the 1-2 day-old (fertile) eggs that don't hatch..........and how many of the 10 day-olds that do! My house has conventional flooring, meaning it's off the ground, and under-penned. I have an easily accessable door that allows me to put them under the house (where nothing can bother them), and where the temp stays very cool .......in the 60's even in August, and the humidity stays on up there, too. My hatch rates are VERY satisfactory!