I had 2 mature Welsummers and then acquired 3 in-lay Warrens. They were kept in adjacent, very nice pens and houses for a few days, before merging them into one small flock. Before the merger they had all slept in their chicken houses and for a few days after the merger, they put themselves to bed all together in one house - as one would expect. Then the trouble started! We had a period of very hot weather and since then they absolutely refuse to go into the house at dusk, sleeping outside in the run. This is still the case, despite the fact that the weather is now cooler. Now I know you are thinking "red-mite"! However I am convinced this is not the problem because prior to the chickens being put in the house, it had been left empty since last September, had been emptied and disinfected 4 months ago and then left empty until this new lot of chickens were put in there. So I am at a loss to know what to do or what is the cause of the strange behaviour. My husband and I have to go out each evening at dusk and catch them and put them to bed, but I do not fancy doing that much longer. However, once it gets cold, they will be very miserable if they stay outside. Any ideas what can be the problem? Or ideas on what I can do to persuade them to use the chicken house.