I am a bit different. I don't believe in artificial heat or cool for birds. After all what happens if you get a power outage. In winter particularly this could be deadly, your bird is used to being in a lovely warm room and all of a sudden the temperature drops, especially at night/early hours of the morning. Many people, especially in Australia don't have central heating and many turn off their heating and cooling overnight and the temperature can either rise or fall dramatically. I have done alot of work for a volunteer advice bird service and I would get calls from people telling me their bird died (mainly in winter). The bird was inside in a lovely warm house during the day socializing with everyone, but at night the bird was either put in the laundry, garage or bathroom, the 3 coldest places in the house and people could not understand why they lost their bird.
Most birds can cope with a wide range of temperatures as long as they are allowed to acclimatize to those temperatures. Where I am it can go from 50 Celsius + in summer down to -8 celsius in winter. Most of my birds are outside in aviaries and cope with all weather conditions. They have cover areas where they can get out of the rain and wind but also open areas where they can get wet if they so choose. So I prefer my birds to be in an area where they have no heat or ac, sometimes I will use a fan in summer just to get the air moving. Draughts are more dangerous for our birds and having them in front of a window in summer, might be a nice idea for them to get some sunlight when the sun is not shining directly onto that window but the poor birds can cook when the sun is directly on it.