Domestic Long Hair isn't a breed. It's the label used for mixed-ancestry cats with a long coat, the fluffy counterpart of the Domestic Short Hair. They come in every color and pattern, from tabby and calico to smoke and solid black, and some resemble a Maine Coon or Persian without sharing that ancestry. Most adults weigh 8 to 15 pounds, though long fur can make a cat look bigger than it is.
Without a breed standard, size, coat texture and personality vary from cat to cat. What they share is a coat that needs regular brushing to prevent mats and hairballs, and the genetic diversity that tends to keep mixed cats healthy. In Baton Rouge, that coat plus the heat and humidity makes grooming and a cool indoor home the main things to plan for.