It could be that no one on here has a halogen oven and so are unable to answer the question.
From a bit of research via the old Google.. halogen uses less energy than a conventional oven ..
But air fryer uses even less as it is shorter cooking times
However it seems people weren't that worried about energy before but since the russian invasion and higher prices air fryers have been popular for people to save cash
Ours goes on at least once if not twice a day ..it's fantastic for kids food
Got it well before the invasion because I love a gadget and my food , has turned out to be one of our most used kitchen items
In comparison our oven went on about 10 times last year? The air fryer was at least 365
So much so when we replace the kitchen I'd go for a smaller oven (we have a double range thing. Came with house) and would get two air fryers (a double one like we have then a bigger one maybe combination pressure cook to do joints of meat) because we prefer the finished cook in the air fryer over the oven
We had an air fryer years ago those Tefal ones .. never used it..was rubbish the times we did ...these new ones are a lot better