Re: These are primarily products for the US - not the UK
"That's not the half of it. Some places can't get a break and have wild seasonal temperature swings. Think 0-degree winters and 100-degree summers. With a setting like that you just can't make a house comfortable year-round passively and need to take special steps to make it livable."
That's Duluth.. Away from the lake anyhow. Only -40 winters and >90F summers (-40 to 32 for the rest of the world). Near the lake temps are a bit more stable.