I keep kingspan on home hives, above the crown board, all year round. I was listening to an interesting feature on '2bees in a podcast' about the importance of insulating in summer as well as winter, by Derek Mitchell, think he's a member of the forum.Yegh I've just been up and the temperature difference is surprisingly colder at dusk and night up there. I just said to my friend we won't lose anything in insulating them with the kingspan we usually put on later on. All my hives have insulated roofs all year but it can't hurt to give them the extra few degrees at night
It's 2 degrees cooler here at 1000ft compared to where my other bees are kept 3 miles down in the valley. But the best heather comes from moors, that are well drained, at 1000-1200ft altitude, Black bees are best up on the moor, I've found (those with any italian in their genetics tend to get up later & stay in more due to the weather not suiting them up here) black / locally adapted bees fly in cooler conditions and mine fly in the rain, tho as soon as the sun comes out they're out of their WBCs in a flash & go bonkers. I'm praying for sunshine 3rd week in Aug!