Bees are very good at ventilating the hive without too much intervention from us, once the hive begins to really heat up, you’ll see bees exit the hive and congregate on the outside (bearding), others will be at the entrance fanning air in and out of the hive to keep it cool. I use ventilated lids and found that the bees propolised up the vents so I have given up. On the really hot days put an extra roof to help shield the hottest sun, I use a beach umbrella and it works a treat.
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