We are renovating our 1913 home that has been renovated before. It currently has radiators throughout most of the house and that is the main source of heat we use now. We keep forced air pretty much off.

During renovation they suggested using the forced air for the 2 new spaces since we already have it installed and seems cheaper/easier to extend that into the remodeled space. That space is kitchen breakfast nook next to dining/living (where radiators are) and playroom which is next room on.

However thermostats are in same spot for both sources of heat currently.

I am struggling to understand how to make both sources of heat work in contiguous space at the same time.

Thanks!

Natalia