Stone farmhouse with double glazing and good roof+loft insulation but solid stone walls.
Right now:

17C in computer room (upstairs bedroom, no heat yet)
19.7C in living room with small fire in woodburner this evening.
16.5C in unheated kitchen.
14C in unheated but heavily insulated outbuilding.

Outside now 11.3C, min today 2.8C. Max today was 13.7C

Outside average last 24 hours: 9.7C
Month av: 10.9C
Year av to date: 8.6C

About now the daytime solar gain becomes almost insignificant even when it's sunny as windows are relatively small by modern standards.
If no heat is introduced the mass of stone internal walls cools steadily, needing a great deal of energy to warm up again.
By November regardless it becomes difficult to achieve 'modern' indoor comfort levels except in 2 or 3 rooms.
Most heating here is from 'free' wood in two woodburners, one of which also heats water and radiators in some rooms.
'Free' wood does need to be dry and stored undercover.
Gathering and cutting takes at least a week but not all at once!

The great majority of the wood is dead from fallen branches and increasingly coppiced material from trees I planted for the purpose in the 70s, 80s and 90s. There is no mains gas here and oil though cheap now is volatile and cannot always be delivered in prolonged snowy spells. So wood and a small amount of coal is easily the best option.

In the past a lot of fires were kept going with peat, not least because there were far less trees - and bringing in coal was more difficult.
In theory rights of turbary (peat cutting) on the moors are still held by most houses near it, but rarely exercised in this area.
Peat is not a high output fuel and also needs careful drying and handling.
 

Originally Posted by: four 

Stone farmhouse with double glazing and good roof+loft insulation but solid stone walls.
Right now:

17C in computer room (upstairs bedroom, no heat yet)
19.7C in living room with small fire in woodburner this evening.
16.5C in unheated kitchen.
14C in unheated but heavily insulated outbuilding.

Outside now 11.3C, min today 2.8C. Max today was 13.7C

Outside average last 24 hours: 9.7C
Month av: 10.9C
Year av to date: 8.6C

About now the daytime solar gain becomes almost insignificant even when it's sunny as windows are relatively small by modern standards.
If no heat is introduced the mass of stone internal walls cools steadily, needing a great deal of energy to warm up again.
By November regardless it becomes difficult to achieve 'modern' indoor comfort levels except in 2 or 3 rooms.
Most heating here is from 'free' wood in two woodburners, one of which also heats water and radiators in some rooms.
'Free' wood does need to be dry and stored undercover.
Gathering and cutting takes at least a week but not all at once!

The great majority of the wood is dead from fallen branches and increasingly coppiced material from trees I planted for the purpose in the 70s, 80s and 90s. There is no mains gas here and oil though cheap now is volatile and cannot always be delivered in prolonged snowy spells. So wood and a small amount of coal is easily the best option.

In the past a lot of fires were kept going with peat, not least because there were far less trees - and bringing in coal was more difficult.
In theory rights of turbary (peat cutting) on the moors are still held by most houses near it, but rarely exercised in this area.
Peat is not a high output fuel and also needs careful drying and handling.
 

Originally Posted by: four