AI Summary
When heat pump quotes differ significantly, ask about sizing methodology, equipment technology differences, installation scope specifics, warranty coverage details, what triggers additional charges, and how each contractor's scope compares to others. These 15 questions reveal scope differences, assumption variations, and value propositions that explain price discrepancies and help evaluate which quote best matches your needs.
The 15 Best Questions to Ask When Quotes Don't Match
You have multiple quotes with different prices and recommendations. These 15 questions help you understand why quotes differ and what each contractor is actually proposing.
Questions About System Sizing
1. How did you determine this system size is appropriate for my home?
Why this matters: Reveals whether contractor used Manual J calculations, square footage rules, or matched existing system.
What to listen for: Specific methodology, mention of load calculations, consideration of insulation and windows.
Red flag: "That's what you have now" or "Standard for this square footage" without further explanation.
2. Can you provide the load calculation results?
Why this matters: Verifies proper sizing methodology was used.
What to listen for: Willingness to provide documentation, specific BTU requirements calculated.
Red flag: Refusal to provide calculations or admission none were performed.
Questions About Equipment
3. What are the specific brand and model numbers for all equipment?
Why this matters: Allows you to compare exact equipment specifications across quotes.
What to listen for: Complete model numbers for outdoor unit, indoor unit, and thermostat.
Red flag: Vague descriptions without specific models or reluctance to provide details.
4. Is this a single-stage, two-stage, or variable-speed system?
Why this matters: Technology type significantly affects comfort, efficiency, and cost beyond SEER2 ratings.
What to listen for: Clear explanation of technology and its benefits for your situation.
Red flag: Uncertainty about equipment technology or inability to explain differences.
Questions About Installation Scope
5. What electrical work is included in this quote?
Why this matters: Electrical work can add $300-3,000 to costs if not included.
What to listen for: Specific details about circuit, wire gauge, disconnect box, or clear statement that existing is adequate.
Red flag: "We'll see what you need" or vague "electrical included" without specifics.
6. How will you verify that ductwork is adequate for this system?
Why this matters: Ductwork problems affect performance more than equipment quality.
What to listen for: Mention of static pressure testing, airflow measurement, or specific evaluation methods.
Red flag: "It looks fine" or visual inspection only without testing.
7. Will the refrigerant line set be reused or replaced?
Why this matters: Line set replacement costs $500-1,500 and affects system performance.
What to listen for: Clear plan for reuse or replacement with reasoning.
Red flag: "We'll decide during installation" without criteria or cost estimate.
Questions 1-7 Summary
These questions reveal:
- Sizing methodology and accuracy
- Equipment specifications and technology
- Installation scope completeness
Answers explain why similar-looking quotes may differ by $3,000-6,000.
Questions About Warranty and Coverage
8. What warranty coverage is included?
Why this matters: Warranty differences can mean $500-2,000 in future costs.
What to listen for: Specific years for parts and labor, what's covered and excluded.
Red flag: Vague "manufacturer warranty" without details or duration.
9. Are permits and inspections included in this price?
Why this matters: Permits cost $50-300 and are legally required in most areas.
What to listen for: Clear yes or no, who handles applications.
Red flag: "Permits if required" without clarification of local requirements.
Questions About Potential Additional Costs
10. What could cause the final price to differ from this quote?
Why this matters: Reveals assumptions and potential surprise costs.
What to listen for: Honest discussion of contingencies with estimated costs.
Red flag: "This is the final price" when quote contains vague language, or inability to identify potential additions.
11. If ductwork modifications are needed, what would that cost?
Why this matters: Duct work can add $500-4,000 if not included upfront.
What to listen for: Estimated range for common modifications.
Red flag: "We don't know until we start" without any estimate.
12. What happens if you discover problems during installation?
Why this matters: Reveals contractor's approach to change orders and unexpected issues.
What to listen for: Clear process for notifying you, getting approval, and pricing additional work.
Red flag: Vague response or suggestion that you'll just have to pay for whatever is needed.
Questions 8-12 Summary
These questions reveal:
- Long-term cost protection through warranty
- Completeness of quoted price
- Potential for surprise costs
Answers help you estimate true total cost beyond quoted price.
Questions About Comparison
13. How does your quote compare to others I've received?
Why this matters: Good contractors can explain their value proposition.
What to listen for: Thoughtful comparison of scope differences without disparaging competitors.
Red flag: Dismissive attitude toward other quotes or inability to explain differences.
14. Why is your price higher/lower than other quotes?
Why this matters: Direct question about price differences.
What to listen for: Specific scope, equipment, or service differences that justify pricing.
Red flag: Defensive response, claims others are wrong, or inability to explain.
Questions About Testing and Verification
15. What testing will you perform after installation?
Why this matters: Verification ensures system operates as designed.
What to listen for: Specific tests mentioned (refrigerant charge, airflow, static pressure).
Red flag: "We'll make sure it works" without specific testing procedures.
How to Use These Questions
Ask All Contractors
Ask the same questions to each contractor to get comparable answers. Don't assume answers based on what's written in quotes.
Document Responses
Take notes or record conversations (with permission). Written responses are ideal for comparison and documentation.
Compare Answers
Create a comparison chart showing each contractor's response to each question. This reveals scope and approach differences.
Follow Up
If answers are vague or incomplete, ask follow-up questions until you understand clearly.
Sample Comparison Chart
| Question | Contractor A | Contractor B |
|---|---|---|
| Sizing method | Square footage | Manual J |
| Electrical work | Assumes adequate | New circuit included |
| Duct evaluation | Visual only | Static pressure test |
What Good Answers Look Like
Quality contractors provide:
- Specific, detailed responses
- Clear explanations of methodology
- Honest discussion of assumptions and contingencies
- Willingness to provide documentation
- Thoughtful comparison with other approaches
- Professional attitude toward questions
What Poor Answers Look Like
Warning signs include:
- Vague or evasive responses
- Inability to explain methodology
- Dismissive attitude toward questions
- Refusal to provide documentation
- Disparaging other contractors
- Pressure to decide without clarification
After Getting Answers
Use the information to:
- Understand why quotes differ in price
- Identify which scope best matches your needs
- Estimate true total cost including likely additions
- Evaluate contractor professionalism and communication
- Make an informed decision based on value, not just price
Get Help Understanding Your Quotes
See what questions your quotes raise and what additional information you need.
Decode Your Quotes →Why These Questions Work
These 15 questions are effective because they:
- Focus on scope and methodology, not just price
- Reveal assumptions that affect cost
- Identify potential additional charges
- Evaluate contractor knowledge and communication
- Provide comparable information across quotes
- Help you make informed decisions
Contractors who answer these questions clearly and thoroughly demonstrate professionalism and transparency. Those who can't or won't answer may be hiding scope gaps or lack expertise.