I broke down and got the heat lamp, we have had a few nasty cold snaps (about -36 F average right now) and my four ladies ended up with frost bite! I picked one up and a timer the same day of the discovery. I was however wondering about cheap insulation ideas. I thought a sturdy house with a vent plus sturdy chickens would make for any easy winter! Boy was i wrong!
If it was getting down to -36F I would consider a little supplemental at night. That is down right cold even if you ARE wearing your custom made down suit. But, I don't think I would go any higher than maybe -10F if it was that controllable. You don't want their bodies thinking 40F is "normal".
And, yes my understanding is frostbite isn't related to cold it is related to WET and cold. So more ventilation to get the moist air out would be a good thing.
Hard to say about the insulation since I don't know how your coop is constructed. I can tell you my girls LOVE to peck at both foil and not foil faced foam board. If you put up anything other than hay bales around the outside, be careful they don't decide it is food.
.... but if it's down into the 30's at night when I finish the coop, will they be ok? Or is that going to be too much of a shock? In other words, am I stuck with birds in the house all winter? (Please no!) Do I need to give this particular batch a heat lamp this winter? Is there something I can do to acclimate them, like ... I dunno, take them outside in the day, inside at night then after a while leave them outside? Ugh! Wish they could have been outside early enough to just grow used to the colder days!
I would think that once they're feathered out, that a 30 degree difference shouldn't hurt them too much--we have such swings on a daily basis sometimes since we live at over 5,000 feet and frequently see 30+ mph winds. Regardless, if they're in a coop out of the wind, rain, etc it should be a bit warmer or at least more comfortable than the outside. If you are concerned, you could put a heat lamp out there, and reduce wattage over the course of a few days/weeks until they are acclimatized--similar to reducing the temperatures in the brooder.
I agree. At 8 weeks they should be pretty well feathered and since your house is at 60, they aren't going from the tropics into winter. I got a reptile remote sensing thermostat with an outlet in it for the girls in their brooder. Figured that was easier than dealing with "is the lamp too high, is it too low" etc. When they went to the coop at ~4 weeks, I put a LARGE cardboard box on end in the coop with the open top facing into a corner and put the lamp and thermostat sensor on a timer in there. Probably wasn't necessary but it was getting down to about 50 at night (mid July) and it had been 75 in their bathtub brooder. I left it there for a couple of days then took it out as they didn't seem to need it.
I would put them out in the coop and see how they respond. If they all huddle in a pig pile, you might want to add a little heat for a few days. My guess is they will be fine, especially if you do some "day trips" when it is colder than in the house. Mine all hunkered next to each other on the roost at night for weeks even though the temps were in the 70s. I think it was more of a "comfort" thing for little kids with no momma to help them feel safe.
Bruce