People often hold several different papers for the same appliance. A manufacturer warranty comes with the product. Installer terms come from the company that set the unit. A service contract is a separate agreement you may have been offered at the point of sale. These documents are not the same, and they do not answer the same question.
What a warranty generally does. A manufacturer warranty is a written statement from the maker about the product for a stated term. It usually names what is covered, what is excluded, and how to start a claim. Read the coverage wording, the term, and the claim route. Keep the proof of purchase with it.
What a service contract generally does. A service contract is an agreement to provide service for a stated period, under conditions set in the document. It is not the same as the warranty, and it has its own exclusions and cancellation rules. Read it as a contract in its own right.
What to ask about a quote. A written quote should name the unit, the scope of work, what is included, and what is excluded. It should say which warranty applies to the parts and which applies to the labor. If the quote is silent on either, ask the seller to add it in writing before you sign.
Transfer when a home changes hands. Some warranties follow the unit to a new owner. Others end when the original buyer sells, or they require the new owner to register. Read the transfer clause closely. Note whether it asks for a form, a registration step, or a set window of time. Keep a copy of the document with the house file, and tell the buyer or the agent what it says.
Cancellation. Service contracts usually state how to cancel, who must receive the notice, and whether any part of the payment is returned. Find the cancellation route before you need it. If the document is unclear, ask the seller to explain the route in writing.
What to check before you rely on any paper. Confirm that the model and serial number on the paper match the unit. Note the term and where it starts, in your own words. Store the original and a copy. Ask who to call and what proof they will need to open a claim.
Where the figures live. Typical service life for the major appliances is on this site's ranked list and on the individual system pages. Use those published figures for planning. They do not replace the paper you hold. If a document says something different from the site, follow the document and ask the seller to explain the difference.
If the terms are complicated or the stakes are high, a licensed professional can read the document with you. Put your questions in writing and keep the answers with the paper.