Temperature Control in a STR house hack

[Michael Vilardo]

I appreciate any input in advance.

I'm currently remodeling the lower half of a split level for airbnb and the like, and I'd like for the guests to be able to control the heating and cooling downstairs. However the thermostat is located on the main floor and it controls the temp for the entire place. 

Has anyone run into a similar situation, I have a few thoughts but I'd like to get some input.

Thanks,