When people talk about "meat chickens" they are usually talking about the Cornish X or Rangers, not heritage or dual purpose chickens. You can look at Cornish X or Rangers as meat specialists, they put on meat so fast. I kinda look at them as special needs chickens too as they grow so fast they may need to be treated differently. Also, it is really hard to hatch your own CX or Rangers from your own eggs so you pretty much have to buy baby chicks. With this group of people on here somebody is likely to try about anything and occasionally even make it work so I'll talk in generalities.
In general, the heritage/dual purpose chickens that we raise for meat aren't really that different from a backyard laying flock. Oh, some of us may feed them a special diet but housing and such is basically the same. So, yes, if you are keeping them over the winter in Maine they need some protection from the weather but also good ventilation.
Unless you get really cold they do not need protection from cold after they reach a certain age. Baby chicks need heat. One cold weather expert in Alaska says he notices a change around -20 Fahrenheit, I don't know if you see that or not. I have not experienced those temperatures raising chickens myself. Protection from cold generally means give them decent ventilation so they can exchange good air for bad and keep breezes from hitting them. The colonists and pioneers managed this long before electricity.
iwltfum makes some good points. A fairly typical model for many of us is to hatch our own eggs in the spring or early summer and have all of them in the freezer before winter. Not that we all do that, we are each different. There are many different ways we can go about this. Some are for out own consumption, some for sale. Some hatch our own eggs (what do you do with the pullets) some might buy baby male chicks. Some buy everything they eat, some of us depend a lot on forage or what we grow.
The more you can tell us about what you are trying to accomplish and why you want to do certain things the more we may be able to help. Knowing what you have to work with can help too. We can warn you of things that can be a problem but also may give you ways to handle that. To me it's easier to discuss specific things than to just talk generalities.