Many of the book's examples were in coldish places like Connecticut, Massachusetts, the Ontario Agricultural College in Guelph, and poultry farms in Michigan and Quebec. The book shows building plans down to (if I remember correctly) 6 x 10 feet, with the roosts on the short wall, 10 feet back from the open (for which read tightly screened) front. Most of the houses were bigger, however: in the 12 x 24 and 10 x 16-foot range. The key feature in all designs was an open (for which read tightly screened) front, with smaller opening windows and sometimes a clerestory vent; the vents and windows were kept closed in the winter, but the front was left open. The experimentation lasted through 30 or 40 years, beginning sometime in the 1880s, if I remember correctly, and the method remained popular down into the 1930s.
When I moved to Maine in 1972, there were still some of these open-air houses around, though they mostly hadn't been used since the 1940s, when the contract-growing battery broiler industry arrived in midcoast Maine and sent everyone into a death spiral of FHA debt for 40,000-bird houses. But I talked to old-timers who fondly remembered their fathers' fresh-air houses (scattered across wide pastures shared with dairy cattle, for the most part), and couldn't quite figure out why their fathers made a living and all they made was loan payments (a hardworking poultry-farming couple I knew both drove school buses to earn enough to raise four kids, despite having two 40,000-bird houses). And they also couldn't figure out why the chickens were so healthy back then, and now (meaning the 1970s) they had such shrinkage.
Download the PDF from Google books and see for yourself. It's worth remembering that the chickens we raise today are the same chickens our grandparents raised, generation after generation of which never saw heat lamps, or insulation, or midnight treats of sprouted mung beans--although most of them ate sprouted oats in the winter, at least around here in what once was oat-growing country. And that our grandparents and great-grandparents weren't dumber than we are; quite the reverse, as near as I can tell.