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The way I see it you have two totally different questions, but both are answered, “It depends”.
When can the chicks go to the coop? If you have electricity out there to provide a heat source and can separate them from any adults, they can go there straight from the incubator or post office. That’s what I do, even if the outside temperature is below freezing. If you can provide an area that is warm enough in the coldest temperatures and an area that is cool enough in the warmest temperatures, good ventilation and breeze protection, and predator protection they can go out there at any age. So basically they can go out there today if you have electricity. If you want more information on this, give me a few details of your chicks like age and number and the situation out there.
When can they go without heat? That is a lot harder. Their age and how well they are feathered out as well as the outside conditions have a lot to do with that. In a ridiculous heat wave a few years back I turned the daytime heat off in that brooder in the coop at Day 2. The overnight heat went off at Day 5. Their body language told me they did not need it and they didn’t. I’ve had broody hens wean their chicks at three weeks in the summer. They did fine without a broody to keep them warm.
There have been times I’ve kept heat on in that brooder for five weeks in the winter. I’ve had chicks less than six weeks old go through nights in the mid 20’s Fahrenheit. My brooder is big enough that I only heat one area and let the rest cool off as it will. There have been times the far end had ice in it but the end the chicks were on stayed toasty warm. So my chicks not only feather out pretty fast since they are exposed to the cold, they are acclimated. They play a lot in the cold end. Also my grow-out coop has good ventilation up high but good draft protection down where the chicks are.
If your chicks are being kept in tropical conditions I’d be more careful in moving them out to below freezing conditions. If you can take them outside in the cold even for short play periods you can help acclimate them plus build your confidence they can actually handle pretty cold temperatures. I know some of this stuff is hard to take on faith alone, it helps for you to actually see it.
It’s hard to give certain ages because we raise them differently, we have different outside temperatures, and our coops can give different degrees of ventilation and draft protection. I’d think after six full weeks even chicks kept in tropical conditions can go outside without a heat source unless it is ridiculously cold, but maybe your coop is made of wire and doesn’t provide much protection.