Domestic Long Hair isn't a breed. It's the label shelters and veterinarians use for a mixed-ancestry cat with a long coat, so you'll see every color and pattern, from tabby and calico to smoke and solid black. Some resemble a Maine Coon or Persian without sharing that ancestry. Most adults weigh 8 to 15 pounds, and the fluff can make them look even bigger.
In Aurora, that coat works in both directions. It's welcome on freezing January nights but can feel heavy when July afternoons climb into the 90s, so a cool floor or shaded window spot helps. Brushing several times a week keeps mats and hairballs in check. Personalities range from mellow lap cats to bold explorers, so spend time with a cat before deciding.