Chickens are creatures of habit. If you want some of them to roost in the new house, you will probably have to close them up in it for a few days and not let them out. It might be better to just have brand new chickens roost in the new one! They're so funny, aren't they!? I've read of folks who have multiple laying boxes whose chickens all want to use the same one. They will actually stand in line and wait their turn!
But, seriously, if you read some of the posts about introducing new birds to your flock, you will probably run across the bit about closing them up in the coop for a few days so they will know that is their home. Best Wishes!