Insurance Co. says car must be in a locked garage

I have Hagerty. The issue I have is you cannot back off coverage in the winter when your car is parked. I'm used to taking liability and comprehensive off since the car doesn't move. But nope, they don't allow that so you keep paying for coverage you cannot use. (No, not a Liberty Mutual fan either!!)
Coverage on my 66 is only 389 a year. 30 grand agreed value, upped it before taking it to Carlisle this year.. just in case....