Yes, you can use regular indoor furniture in your sunroom—especially if your sunroom is a well-insulated, four-season model. These rooms are designed to maintain more consistent temperatures, which helps protect traditional materials like upholstered chairs, wooden tables, and area rugs. If you’re building a three-season room, choose pieces made with durable or outdoor-rated materials that can withstand temperature changes and exposure to natural light. Your sunroom can still feel cozy and stylish—just be sure to place delicate fabrics or untreated wood out of direct sunlight to extend their life.