Start with the equipment and installation
Put the exact furnace and controls in one column for each quote. Include heating output, features, the reason for the chosen size, vent work, drainage where applicable, electrical work, permits, disposal, and any work by another trade.
Mark what is included, excluded, or still to be confirmed. A quote that costs less because a required piece is missing is not yet comparable. A higher quote should also explain why its added work is needed.
Ask whether the installation will be checked against the model requirements before handoff. You should know what record you receive and what still needs follow-up.
Identify the actual filter arrangement
Ask for the cabinet model and approved replacement filter. Compare access for safe owner care, replacement price and availability, and the filter the furnace setup is designed to use.
A deeper cabinet or a higher printed filter rating does not, by itself, establish better home fit. Ask the contractor to explain compatibility with the selected furnace and the airflow needed. Do not accept “premium filter” as the complete specification.
If a cabinet is optional, ask what the existing arrangement lacks and what the proposed change improves. If it is needed to meet the design, include it in every comparable total. Do not remove a necessary item just to make the quotes appear equal.
Read coverage as terms, not years
The FTC advises checking what a written warranty covers, the claims process, and whether you pay labor. FTC warranty comparison guidance.
Separate manufacturer parts coverage, contractor labor coverage, and any separately sold service agreement. Ask about registration, exclusions, transferability, and who to call. Obtain the terms that apply to the exact purchase. A “ten-year warranty” headline leaves too much unanswered.
Ask what first-year care means
Is this a specified professional check, a discount, or a visit that only occurs if you schedule it? Request the included tasks, timing, price after the first year, and any conditions affecting coverage.
The visit should have a purpose you can explain. Do not give a vague free-care line more weight than a clear installation scope. Also do not assume care guarantees no breakdowns.
Your next action is to ask all bidders for these details in writing, then compare full installed price and the ownership costs you can verify. Choose the project that meets the home's needs and gives you a clear handoff, rather than the quote with the longest list.