Start by checking that the proposals solve the same problem
A useful HVAC quote comparison begins with what each contractor is proposing to do. One proposal might replace equipment while another also changes controls or ductwork. Put those differences in writing before comparing the totals.
At the top of your notes, record why you are considering the work: a failed system, repeated repairs, uncomfortable rooms or a planned upgrade. Share the same priorities with each provider. Keep each original proposal, including its date and any later revision.
Ask how the recommendation fits your home
ENERGY STAR recommends a home evaluation and written, itemized proposals when choosing an HVAC contractor. Record the proposed model numbers, capacity and efficiency ratings, then ask how the contractor arrived at that recommendation.
The worksheet records what providers tell you. It does not calculate the correct equipment size or rank technical designs. If two recommendations differ, ask each provider to explain what they assessed and how their proposal addresses your priorities.
- Which comfort concerns does this proposal address?
- What assessment informed the equipment selection?
- Which existing components stay, and which are replaced?
References: ENERGY STAR: hiring a heating and cooling contractor
Compare the work line by line
Use one column per proposal. Copy the description of each item in your own short notes and mark any unanswered item “Not stated.” That is a question for the provider, not proof that the item is excluded.
Our suggested rows cover equipment, removal, controls, ductwork, electrical work, approvals, startup checks and cleanup. The included CSV has three proposal columns and an extra column for follow-up questions. Delete rows that do not apply and add anything specific to your home.
Keep the total, optional work and payment terms separate
Record the price for the quoted work as well as optional items. Ask whether the total includes the stated fees and what circumstances could change it. If extra work is discovered, establish how the contractor will explain the change and obtain your approval.
A monthly payment is different from a total purchase price. If financing is offered, keep the lender’s written terms with the proposal and compare the full cost and conditions. Record incentives separately and verify current eligibility with the program provider before counting on them. No rebate or savings amount is assumed in this worksheet.
Write down who handles what after installation
Use separate entries for equipment coverage and labor coverage. Ask who handles a claim, what is excluded and whether registration or maintenance conditions apply. Keep the actual written warranty documents with your comparison.
Also ask what startup checks, operating instructions and completion documents you will receive. A clear handoff gives you a record to return to if a question comes up later. These are suggested questions, not a promise that every contractor includes the same services.
Confirm the contractor and the local approvals
Use Virginia DPOR’s lookup to check the contractor’s license record and follow its hiring guidance. Ask the company to identify the business responsible for the work so you can match the proposal to the appropriate record.
For a Loudoun project, ask which permits or other approvals apply and who will arrange them. County permitting guidance also identifies possible incorporated-town and HOA requirements. Confirm the requirements for your specific installation rather than assuming every replacement has the same process.
References: Virginia DPOR: choosing a contractor · Virginia contractor license lookup · Loudoun County: permits and approvals
Close the gaps before making a decision
Send each provider a short list of the unanswered items in their proposal. Save their responses and ask for important changes to be reflected in the written scope. If you are still comparing different work, label the differences rather than forcing them into a simple cheapest-to-most-expensive ranking.
Download the worksheet to work offline. You can print the PDF or edit the CSV in a spreadsheet app. Nothing you type into a downloaded file is sent to this site. The website form accepts your written questions, not uploaded quotes; we ask before sharing an inquiry with a contractor.