Chicken and rooster sneezing

[Aroz26]

Hi guys, this is my first time posting. We have just moved into a small farm that came with a rooster and 4 hens plus one very run down chicken coop. Our chickens all free range during the day then return to the coop at night. One of the hens is brooding over 14 eggs at the moment but I noticed yesterday when she came out of the nesting box she was sneezing and then today the rooster was also sneezing. I've been a bit worried they might be getting sick as it is the middle of winter here in New Zealand. Also with the coop not being the best conditions I'm a bit worried it might be too cold or drafty for them. I'm planning on insulating the coop as soon as the weather clears but is there anything I can give them in the mean time as in some type of supplement or food that can prevent them from getting sick? I admit this is my first time caring for chickens and with our sneezing hen preparing to hatch 14 eggs very soon I seem to constantly have chickens on the brain lol

 

[BellaBokBok]

Mine occasionally sneezes but other than that she's healthy so I don't think it's serious

 

[dawg53]

It could be an environmental issue rather than a respiratory disease. Most respiratory diseases have other symptoms such as; wheezing, gurgling, rattling, head shaking, bubbly eyes, facial swelling, snotty nostrils and so on.
The coop may require cleaning. Dust, ammonia fumes from soiled bedding etc... could cause your birds to sneeze.