Look this up on the net, it's a load calc program from Natural Resources Canada equivalent to a Manual J and it has US weather data. Did I mention it's free.
I played with it - it's not really for load calcs.
Hot 2000 is used to simulate energy consumption and calculate the canadian energuide rating of houses.
I've discovered a natural law - everything gets progressively worse. Things only break down and become depleted. Life isn't worth living and everything is going to hell.
Death is the messiah. Everything else is irrelevant and arbitrary.