Fridge method works great. I make a gallon or two and store it. I use the natural cane sugar versus the processed white sugar. Buy the ten pound bags from Costco or Sams, etc. The hot air does promote the mold and bacteria in the sugar mixture faster.
I've also read that you do not need to boil it, regular tap water works fine. If you want, fill some pictures with water the night before and allow the chlorine to dissipate. Because...........
Read an article about a study and the black "mold" that grows on feeders is NOT harmful to HB's. That in fact, they are responsible for spreading it to feeders from their beaks. So the boiling issue is a choice, not a necessity.
