A place neither hot nor cold is not a geographical location, nor is it a state of mind.  It might be called a state of no-mind, as in the state beyond distinctions between good and bad, hot and cold, up and down, and so on.

Hot and cold are only that way in relation to us.  Things are cold only because they feel cold compared to our human bodies.  To an iceberg, freezing would feel just about right.  Other things feel hot only in relation to us; to the sun, the hottest day on earth might feel cool.  Hot and cold are only in relation to ourselves, and if we take ourselves out of the picture, "we" (whatever that may be after we're out of the picture) have arrived at a place neither hot not cold.

But having said all that, it's been a particularly hot and muggy summer.