Use these questions to compare scope, compliance, warranties, and installation quality—not just sticker prices.
Questions about the design
1. Will you perform a room or whole-home heating/cooling load calculation? 2. What capacity does the calculation support? 3. How will existing duct leakage or insulation affect the result? 4. Which rooms are expected to be served and at what airflow?
A credible explanation ties equipment size to your home rather than to square footage alone. ENERGY STAR recommends properly sizing heating and cooling equipment.
Questions about equipment and work scope
5. What are the exact manufacturer and model numbers? 6. Are the indoor and outdoor parts an approved matched system? 7. What efficiency ratings apply? 8. Will you replace or reuse lines, drains, thermostats, and duct transitions—and why?
9. Which permits or inspections are included? 10. Who handles electrical changes and the disposal of removed equipment? 11. What conditions could result in change orders, and how will they be approved?
Questions about verification
12. Will you check airflow and refrigerant-related performance according to manufacturer procedures? 13. Will you demonstrate heating, cooling, and thermostat operation? 14. Will I receive startup readings or a commissioning checklist?
A successful installation is more than a unit turning on. Proper setup is essential to comfort and efficiency.
Questions about the contract and company
15. Which labor and manufacturer warranties apply, and what voids them? 16. What are the payment stages and cancellation terms? 17. Who is responsible for registering the warranty? 18. What happens if the system cannot maintain expected comfort after installation?
Verify licensing and insurance requirements with your state or local authority. Ask for written answers from the contractor instead of assuming terms from an advertisement.
Red flags to discuss before paying
Be cautious of a refusal to document scope, pressure to decide immediately, unexplained equipment substitutions, or promises of guaranteed savings without assumptions.
A clear quote may cost more than a vague one because it includes work excluded elsewhere. You need enough detail to decide fairly.
A short email that makes bids comparable
Before comparing prices, send each bidder the same request: “Please list the proposed model numbers, capacity, efficiency ratings, permit responsibilities, installation scope, exclusions, test procedure, warranty, and payment milestones.”
If one contractor will not explain the equipment pairing or commissioning steps, consider that a reason to seek clarification. Transparent scope matters more than a polished brochure.
Keep researching
For connected questions, visit our Quotes & Contractors library. Compare the details with your actual home, utility bill, and the written scope from a local contractor.
Technical references
These references explain the equipment, installation, or maintenance principles discussed above. Local code, climate, and contractor scope can change what applies to your home.
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