You wouldn't think sitting a bag of tea in cold or room temperature water would be very good. You might think that it would taste bland and watered down. It doesn't. I think it may even taste better than the original! Since I like my tea a bit strong I use 3 tea bags for 15 minutes in the sunlight. It is perfect for a house wife with three boys. Not much work must go into it and I do not have to worry about forgetting that the tea is on to boil!