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Hi there! Thank you for your interest in the Dyson Pure Hot + Cool Link. While the purifier will work in a room with the windows open, it may take longer to clean the air and may not provide an accurate reading of the air quality in the room. Best Wishes, Krystal Dyson Customer Service
Sorry, there was a problem. Please try again later.Yes it will work, but you will only feel the breeze, defeating the purpose of cooling or heating your room. I leave mine on during the day with curtains shut, and my air conditioner rarely kicked on during the day. It keeps the room comfortable.
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