How to tell if baby is right temp?

For some reason I'm really worried about my baby being too hot or cold when it's born. We have a 225 year old farmhouse in upstate NY and don't have AC (have never needed it). We heat with wood mostly. We plan to cosleep but I know babies like to be swaddled when sleeping. How will we know if the baby is too hot in our bed? I know we can't use blankets near baby. Normally our house is like 55 in the winter but what's a good temp for a baby? Baby is 9 days overdue now so will be around 6 months when it gets really cold.