Here is the common disclosure type items...
Laws typically require the seller to supply this type of information:
Do you have legal authority to sell the property?
Are there any encroachments, boundary agreements, or boundary disputes?
If the property is served by a public or community sewer main, is the house connected to the main?
Has the roof leaked?
If yes, has it been repaired?
Have there been any conversions, additions, or remodeling?
If yes, were all building permits obtained?
Further more
A disclosure form or statement isn't an inspection report on the condition of the property, nope not at all. If you need a report on the actual condition of the components that make up a house, you need an inspection and report by a Building Inspector (private or government). A building inspector is supposed to crawl all around the house, looking in every nook and cranny and making sure everything is working properly, and if it isn't, they are supposed to let you know about it. A buyer doesn't provide an inspection report, or pay for it. The buyer provides a more general disclosure about the property and what might impact the value, without looking behind every switch plate or crawling under the house. Additionally, and in almost every case I know of, the disclosure applies ONLY TO SOME, BUT NOT ALL, TYPES OF RESIDENTIAL REAL ESTATE. There are numerous exceptions to the laws and it your RESPONSIBILITY TO KNOW THE LAW IN YOUR STATE.
OK, so you can sue your inspector for a few hundred dollars. You can sue for a used a/c. You can sue for breach of contract if you have in writing that the a/c worked. Sorry to day, doesn't look good. The main thing for an inspector is to make sure the heater, water heater, a/c and the major ones work. This is why you have one.
Essentially, I hate to sound negative, but you should get a new air conditioner and learn from it. Outside of that, only lawyers will make money on your claim.
Finally, see a lawyer, yet I doubt air conditioners are covered by state law. If those things were covered why would you need a home insection?