A warranty is a guarantee provided by the manufacturer of a product. It assures you the things you buy are of good quality and don’t contain manufacturing defects.
Warranties give consumers the right to ask the manufacturer to deal with any issues according to their terms and conditions.
You should make sure at any kind of A/C install to ask the Company for a registration certificate to make sure your new unit has been registered at the manufacturer website. If not it might happen that your warranty will be only 5 Years instead of 10!