Aircon self repair
Link dump
A surprisingly good page on repairing air conditioning systems. Some good images in there. Would be great to see if any can be included in the wiki:
https://www.familyhandyman.com/list/how-to-fix-the-most-common-air-conditioning-repairs-yourself/
An overview on how aircon works, with a small section on the environmental cost and evaporative air conditioners: