So, we moved in last year and have experienced the Aga through all seasons now. Is it OK to turn the Aga down, eg when we are away on holiday? If so, just how low can I go? Is it also possible to turn it down during the day (so I don't cook the dogs) and then back up again when we cook?
Yes, you can turn it down while you're on hols. Not sure how low (ours is an old oil Aga converted to gas so a bit temperamental) Not sure it would work turning up at night and down in the day, it stores the heat so you probably wouldn't notice much of a difference.
You can turn it off altogether while you're on holiday if you like - my mum does this with hers while they are away. Just bear in mind it will take a while to heat up again when you get back - a problem if you want to cook straight away or it heats the hot water for you. You can turn it down but obviously again it won't be as hot for cooking etc. As previous poster said I wouldn't think turning it up & down daily would work that well.
We have our gas powered Aga turned off completely during the warmer months because it gets unbearably hot in the kitchen. We have a free standing electric cooker for use during this time. The gas bill if left on all year round is eye watering!