Natural ventilation, operable windows, green walls, living roofs, air purifiers, HEPA filters, UV light disinfection, ceiling fans, whole-house ventilation systems, energy recovery ventilation, heat exchangers, moisture control, indoor plants, natural fibers, low-VOC paints, sustainable materials, eco-friendly furnishings, bright airy spaces, open floor plans, minimalist decor, soft diffused lighting, warm neutral color palette.