A thin layer of Sweet PDZ on the poop boards, poop boards scooped daily, hemp bedding on the coop floor, hemp bedding changed out annually, 22 sq ft of year round ventilation with an additional 22 sq ft opened up for warm weather ventilation and probably most significantly, a predator proof run attached to the coop where the pop door is never closed where the chickens immediately retreat to when coming off the roost.
The run is covered with wood chips that get raked about every other month to even them out and everything cold composts in there. I've never removed material from the run. My brother-in-law commented when he entered the coop for the first time "I can't believe it doesn't smell in here."
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