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Maybe.
It depends so much on your individual coop design, #chickens, am't of ventilation, coop humidity, etc etc that it's hard to predict for sure.
Smart thing would be to have available an outlet and somewhere SAFE SAFE SAFE to hang a lamp, but then wait and see if you actually need them. You may not. Some people have chickens do just fine down to -20 F (actual indoor coop temp) or lower... and remember the coop will stay warmer than the outdoor temp on the coldest nights.
Put a max-min thermometer in there -- preferably one of the old-style mechanical ones, as AA batteries do not always work well in subzero temps -- and you will get a sense of how your coop behaves. And then just sort of let the chickens guide you in what to do.
You'll have a *wide* roost (like the wide side of a 2x4) and lots of bedding and lots of food, and no leaky or spilling waterers, right, so they will be good down to really pretty cold temps.
Does everyone shovel out their girls' runs? Will the chickens even want to go outside in the winter?
You may want to shovel out major drifts, but you don't want to expose bare frozen ground or ice, as that is hard on chicken feet. (If you have bare frozen ground or ice anyhow, it may be worth throwing down some straw or something... although I warn you it will turn into a horrible wet stenchy mess in the spring thaw and you will have to hold your nose and slop it all out
)
Some chickens go out a lot in the cold, some hardly at all, it is hard to tell how your particular chickens will act. Partly it depends on wind -- chickens are not big on Blustery Days -- so if you are in an exposed area, whatever you can do in the way of windbreaks will make the run a bit more appealing.
Also, it gets dark here around 4:30 pm in the winter. Should we have a light on earlier in the morning, or later in the day?
If you're going to add light, it makes most sense to add it pre-dawn. That way its heat is being added to the coop when it's coldest out (since it *will* be adding a bit of heat *anyway*, you may as well get maximum use out of it
) and the birds will experience natural gradual dusk which helps them get onto the roost (a sudden lights-out can leave them stranded in the dark)
But it is a personal decision whether to add light. I don't, FWIW, and my winter daylength is probably about the same as yours (I'm an hour north of Toronto); the sussexes slack off to hardly laying, but the sexlinks I've had did not slow down at all despite no additional light. So it depends on the breed. Remember you can freeze extra eggs now for use in cooking if the hens are laying less around the solstice.
Good luck, have fun,
Pat