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The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
Outdoor buns that remain always outside can cope with winter températures (thick winter layered fur grows) as long as the rules are adhered too, which is that shelter is provided from wind, rain (check which way the rain falls), snow, off the ground, plenty of food (calories = warmth) and water (unfrozen in the winter) and plenty of straw to nestle down into if necessary.
When it is cold like now, it is recommended that buns do not go from outdoor to indoor if more than 10° difference (thermic shock). (I have friends Sth UK who keep their bonded buns outside at night in a big double manion hutch too big for the house, but they are in the (human’s) house most of the day – but at the moment they are only outside as the difference in temp would be too much coming into a heated home)
Buns can cope with cold much better than overheating in the summer.
So based on all this info, your buns are indoors now, they should stay in until the weather gets up to 13-15°in the spring time as they won’t have their winter coats.
Get the insulation of the shed sorted and they should be able to stay out there next winter if really necessary
But of course a house is a happier home with the buns indoors all the time 