Hi mhh,
That was a quick reply to say the least!
Yes, it is cosy but can be too warm on hot days but brilliant on cold(ish) days. Ceiling,walls and loft roof are insulated. This resulted from when I had a fire in here and the repairers did an absolutely wonderful job of repairing the garage-re;shop.
Sometimes forget what the inside of the house looks like apart from the kitchen when having a coffee etc. Thm: