Chickens are VERY cold tolerant - I wouldn't worry about them being cold. Honestly. Chickens are raised in Alaska without supplemental heat and do just fine so I think they can handle pretty much anything Kansas can throw at them. What will make it hard for them to get through a winter without cold related issues are poor ventilation and drafts. So rather than thinking of it as allowing more cold in, look only to adding ventilation without creating drafts. If you can smell ammonia, you are right that there isn't enough ventilation, and that will cause problems for them this winter. When you hear people talking about frostbite, it is because there isn't enough ventilation to vent the humidity from the exhalations from the birds' breathing.I have been having an issue with my coop smelling like ammonia EVERY morning. That in and of itself worries me. I've been trying to figure out how to add more ventilation without making the coop COLD for this winter.
Adding ventilation without creating drafts can seem like a daunting prospect. First, you don't want to place a source of air entering the coop, at the level of the roosts. If the air is blowing right on them, they are going to be sitting in drafts whenever it is windy, and that won't be good for them. Consider the effects of cross-breezes. I.e. adding one window will allow some air to go in and out, but add a window across the coop from the first and you'll create a cross-draft that will suck air in one side and out the other. So, thinking about how those principles work, you can use that for you rather than against you. I.e. instead of putting a window on each end of the roost, creating a draft across the roost, place your windows so that the cross-draft works in your favor.
Trish, yay for making progress on your breeder coop - we need updated pictures!!!
I've just returned from Sam's Club and is it just me or is that place one of the biggest rackets out there? I'm the type of person who tends to remember prices and more often than not I find that things at SC are actually more expensive than at Dillons. Plus, at Dillons they provide bags, employees to bag it for you, employees to help carry it out to your car (if you want them to, which I never do) AND they don't charge a membership fee. I do still shop at SC but do it very, very carefully. As an example, last week I bought Roma Tomatoes at Dillons for 99c/lb. This morning I saw a big sign at SC: "Roma Tomatoes - 3 lb for $6". Ummm....I can do the math here folks and that is twice what they cost me a few days ago. A 10-lb bag of potatoes was $2.98. I paid $2.88 at Dillons last week. Plus, most of the stuff they sell at SC isn't even the kind of food I would want to feed my family. You can't find brown rice, whole wheat flour or whole wheat pasta there - everything is white. It is even hard to find decent quality whole-wheat bread. So much of the food there is over-processed, packaged food that we just never eat. So all I really go for is the fresh fruit/veg, and I often get a salmon, and some block cheese there. So it was disappointing to find that the fruit/veg was more expensive there than at Dillons this morning. Even the gas, which is supposedly 5c per gallon cheaper really isn't, because they just inflate the price they start at. As I was leaving I noticed they had a sign up saying today's gas price is $3.61/gallon. Then I drove past QuikTrip where the gas was $3.63 - only two cents higher, not five.