Identify exactly what is changing

This checklist is a practical recordkeeping approach, not a statement that every project has identical contract rules. ENERGY STAR recommends written HVAC proposals identifying costs, models, schedule and warranty information. Apply that same clarity to a proposed revision. Locate the original agreed scope, then ask which specific item is being added, removed or substituted. A note that says only 'additional work' leaves you unable to compare the new agreement with what you already approved. Keep the original document rather than replacing it with the latest version.

Request a complete revised description

Ask the contractor to explain the finding that led to the change and what evidence supports it. Photographs or a plain-language explanation can be more useful than a part name alone. Request the added or reduced amount, revised project total and any timing effect. Clarify whether an equipment substitution changes the indoor or outdoor model, included controls, testing or warranty terms. These are questions to resolve before approval, not assumptions that the lowest-cost alternative will perform identically.

  1. Compare the proposed change with the original scope line by line; mark anything you cannot explain in your own words.
  2. Ask who can approve the revision, how approval is recorded, and whether work affected by the decision will pause until it is resolved.

Check that both parties mean the same thing

If the contractor says a change is necessary, ask what happens if you decline and whether there is a safe alternative. Separate immediate safety concerns from elective upgrades. Do not ask a worker to continue operating equipment they have identified as unsafe. If a revised amount is shown as an allowance or estimate, ask what will determine the final charge. A clear response should let you distinguish a fixed agreed change from a cost that still depends on findings or materials.

Preserve an approval trail and final reconciliation

Save the dated revision, the explanation and your recorded decision with the original proposal. At completion, compare the invoice with all approved changes and ask about discrepancies while the work is still easy to discuss. Contact the project manager if different workers describe different scopes. For an unresolved contractual dispute, obtain qualified advice appropriate to your situation rather than assuming this checklist determines your rights. The useful outcome is a shared written understanding of the work, price and timing, with no guesswork about which version was approved.

Know when to stop

  • Pause approval if the contractor cannot explain the changed scope or revised total.
  • Keep away from any equipment the technician has taken out of service for a safety concern.

Use only normal controls and manufacturer-approved homeowner maintenance. Leave gas, refrigerant, wiring and internal equipment repairs to qualified professionals.

Sources & editorial notes

General education for common residential systems. Your equipment manual and a qualified technician’s assessment take priority. Report a correction through our contact form.

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