Explain which operating mode has the problem
State whether your concern happens while heating, cooling or both, and whether it affects the entire home or particular rooms. Include any message visible on the thermostat and recent service history if known. Describe what you observe instead of assuming that an unfamiliar sound or operating cycle identifies a failure.
Clarify the proposed repair scope
Ask which equipment and controls the diagnostic visit will cover, including any backup heating equipment relevant to the concern. Request a written explanation of the diagnosed problem, proposed work, parts availability and charges. Find out whether follow-up testing and a return visit are included.
Compare replacement proposals consistently
For replacement, ask which indoor and outdoor components and controls are included and how their compatibility will be confirmed. Ask about sizing, backup heat, electrical or duct changes, removal of old equipment and commissioning. Keep optional upgrades separate so that the base installation scopes can be compared.
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