To keep your sunroom comfortable year-round, consider a mini-split system, which can cool it in the summer and heat it in the winter. Adding extra insulation can improve comfort, though retrofitting may be challenging. Upgrading your windows to block UV rays is another effective option. For seasonal relief, ceiling fans, blinds, curtains, and other window treatments can help regulate temperature. Additionally, installing a retractable awning outside your sunroom can provide shade and enhance the comfort of your outdoor living space.