How do you set the temperature? Does the outside temperature effect the desired temperature of the hot tub?

Well the wemo needs 120vac for control so really id think the wemo isnt the best way of doing this. Your better off using the wemo maker which would do what you want it to do.

Get lots of help from an experienced electronic hobbyist.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.