There are a number of ways you can dispose of an old AC:
Recycling - Vital parts like metal and plastic can be recycled and used to make something new although rare. To do this you should take your old air-conditioner to a recycling factory and drop it off at the designated area. The experts there should then be able to help you.
Donating - If it is still working, it could help someone else or a group of people in a homeless shelter.
Bounty Programs – These are deals offered by organisations for turning in certain items, especially old and worn out things that can be recycled. If you want to get rid of your old air conditioner, you can consider going for bounty programs where you could even get your money back. If you do not get a cash reward, you may receive discounts on other items that you may wish to purchase like another air- conditioner of higher-efficiency.
Local Disposal Programs - You should contact your local council to guide you on how you can dispose of the air conditioner. In some areas, there are designated disposal areas for electronic waste and specific sections where old air conditioners are placed so that the authority can take care of them.
Try 1300RUBBISH if you are in a large city. Cost approx. $150.