@nprofile1q... figured that out here over the years by outdigging the original old house -now it works fine again -in summer the sun goes over the windows -and in winter is full shining in - the kittchen lays north and always cool and so do the caves -the cheminee can be opend in summer over the nights as cooling air ventilation i found out -what luck we didnt torn them down for a new 😉 heating system - they are from real stones and in winter they warm as a block inside for days once warm @nprofile1q...