A written quote is a set of terms for one job, for a stated window. Before you compare totals, find the part that says how long those terms stand and what they depend on. Many quotes are good only for a set window, and the same work may be priced again after it ends.
Find the validity line. Look for the sentence that says how long the price and the scope stand. Note what the window counts from, whether the day the quote was written or the day you accept it. If you cannot find the line, ask for it in writing before you decide.
Check what the price is tied to. Ask whether the total is a fixed price for the written scope or an estimate that moves once the crew sees the site. A quote that says it depends on site findings is not the same as one that fixes the scope. Put the question in writing and keep the answer.
Read the scope in plain terms. Look for four things: what is removed, what is installed, what is reused from the old system, and what is tested before the crew leaves. A scope that names the equipment, the connections, the cleanup, and the test readings is easier to hold a crew to than one that says the job is complete.
Find the change clause. Ask how an added item is priced once work starts, who approves it, and whether that approval is written before the work goes ahead. Ask what happens if the crew has to stop partway through, and who decides when work resumes.
Ask about payment timing. Compare when money is due against when the work is done. Do not compare the figures across quotes until the timing and the scope line up.
Separate the warranties. A quote may mention an equipment warranty, a labor or workmanship warranty, or both. These come from different parties and cover different things. Ask who holds each one, how you start a claim, and where the written terms are. Do not treat a warranty line on the quote as the full terms.
A quote, a contract, and a warranty are three different papers. A quote is an offer for one job. A service contract is an ongoing agreement with its own waiting period, cancellation rule, and transfer rule. A warranty is a promise about a product or a piece of work. The terms in one do not carry over to another. Read the definitions and the exclusions in the document that applies to the thing you are buying.
Questions to bring to the table.
- How long do the price and the scope stand, and what does that window count from?
- Is the total fixed for the written scope, or is it an estimate that can move?
- Who approves an added item, and how is that approval recorded?
- Who holds each warranty, and how is a claim started?
- Who signs the completion record, and do I get a copy of the test readings?
Keep the signed quote with the house file. The published figures for how long each system typically serves are in the tables on this site. Use the list of major appliances ranked by typical service life for life spans, and use the quote for the terms of the job.