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Hi Unta

Whilst I agree that air roasters are inherently inefficient there are ways to improve the efficiency.
The main way is to increase the bean bed depth which means increasing the pressure available to loft the beans.
I would be very interested to know how many roasts you get out of your 9kg bottle of gas. I would be surprised if you can get enough heat to finish a roast once the bottle gets down to half full especially in the weather you are dealing with currently.
I find even in ambient temps of over 20C that much below a third full and it is a struggle to finish roasts. The fix for that is to put the gas bottle in a container of water to get it up around 20C.

Rob
NZ