"What is the SEER rating of the unit you're quoting?"

Why it matters: SEER (Seasonal Energy Efficiency Ratio) directly affects your monthly energy bills. The difference between a SEER 14 and SEER 18 system can be $300-$500/year in cooling costs.

"What brand and model number are you quoting?"

Why it matters: Without a specific brand and model, you can't comparison shop or verify that the equipment matches the quoted SEER rating. Some contractors quote "equivalent" units to leave room for substitution.

"Is the permit included in your quote, and who pulls it?"

Why it matters: HVAC replacements require mechanical permits in virtually every jurisdiction. The permit ensures the work is inspected for safety.

"What is the warranty — both on parts and labor?"

Why it matters: Equipment manufacturers offer parts warranties (5-10 years), but that only covers the component itself — not the labor to replace it. A compressor failure at year 3 could cost $1,500 in labor even if the part is free.

"What does removal and disposal of the old system include?"

Why it matters: Old HVAC systems contain refrigerant that must be legally recovered by an EPA-certified technician. Disposal also includes hauling away the old equipment.

"What size system does my home need, and how did you calculate it?"

Why it matters: An oversized system short-cycles (turns on/off frequently), wastes energy, and fails to dehumidify. An undersized system runs constantly and can't keep up on extreme days.

"Are you licensed, bonded, and insured? Can I see proof?"

Why it matters: Licensing ensures the contractor meets minimum competency standards. Bonding protects you if they abandon the job.

"What is your timeline, and when can you start?"

Why it matters: Good contractors are busy — a 2-4 week wait is normal and actually a positive sign. Same-day availability during peak season (summer) can indicate a contractor who struggles to get work.

"Will you modify or replace any ductwork, and is that in the quote?"

Why it matters: Ductwork connects your new system to every room. If existing ducts are undersized, leaky, or damaged, even the best new system will underperform.

"What is the payment schedule?"

Why it matters: Industry standard is a small deposit (10-30%) to secure scheduling, with the balance due on completion. Contractors asking for full payment upfront is a major red flag — it removes their incentive to finish the job properly.

"Do you offer a written contract or proposal?"

Why it matters: A written contract protects both parties. It should detail equipment, scope, timeline, warranty, payment terms, and what happens if issues arise.

"What thermostat do you recommend, and is it included?"

Why it matters: A smart thermostat (Nest, Ecobee) can save 10-15% on energy costs and is an easy upsell for contractors. Some quotes include a basic thermostat while charging you for a premium one.

"What happens if you find unexpected problems during installation?"

Why it matters: Homes hide surprises: asbestos insulation, corroded electrical connections, damaged drain pans, cracked heat exchangers found only after removing the old unit. Knowing the contractor's process for handling surprises prevents shock invoices.

"Can you provide references from recent jobs in my area?"

Why it matters: References let you verify quality, professionalism, and follow-through. Recent local references are most valuable because building codes and climate conditions are the same as yours.

"Is there a maintenance plan, and what does it include?"

Why it matters: Annual HVAC maintenance extends system life and maintains efficiency. Many contractors offer service plans that include annual tune-ups at a discounted rate.