Q: Can it cool multiple rooms? A: Designed for single rooms up to 400 sq ft. Use multiple units for larger spaces. Q: How often does the water tank need refilling? A: In humidifier mode: 8-12 hours. In standard cooling: 3-5 days. Q: Is there a warranty? A: 5-year limited warranty with optional extended coverage. Q: Can it heat in winter? A: Optional heating module availab... https://www.onehealthgiant.com/polar-cooling-reviews/