Hello, how would you suggest I set the 2 separate thermostats for the upstairs and downstairs. There is 1 stairway door between them and the downstairs is the first floor. Is it better in the winter to set the upstairs at a higher temperature than the downstairs or vice versa? What about a/c weather which is better setting? What should the thermostats be set on for upstairs and set for downstairs. Oh! I have a unit for up and one for down.

Heat rises. So depending on insulation for the most part the upstairs is usually set lower in winter and may be set higher in summer from the settings on the lower level. A lot depends on location and insulation and the way your home gets sun and windows etc. mostly its going to be personal choices.

I have the spray foam insulation in the attic and I have sun in the morning until about 11am in the front and about 7pm in the back. I have three window upstair and 7 downstair in the front of the house and 4 on the back. So, you are saying if the te