Choosing the Right HVAC Company: 10 Questions to Ask Before Hiring
Hiring an HVAC company is one of the most consequential decisions you will make as a homeowner. A great company will keep your system running efficiently for years. A bad one can cause damage that costs thousands to fix, void your warranties, and leave you dealing with problems you did not have before they showed up.
The challenge is that most homeowners have no easy way to evaluate HVAC contractors before hiring them. The trucks all look professional. The websites all say the right things. And by the time you realize you made a poor choice, the work is already done.
That is why we put together this guide. These 10 questions will help you separate the trustworthy professionals from the corner-cutters -- whether you are looking for a new system installation, a repair, or ongoing maintenance in the Wilmington, NC area.
1. "Are You Licensed by the State of North Carolina?"
This is the most fundamental question and the one most homeowners forget to ask. In North Carolina, HVAC contractors are required to hold a Heating Group 1 license issued by the North Carolina State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors.
What to look for:
- Ask for their license number and verify it on the Board's website
- Confirm the license is current and active (not expired or suspended)
- The license should be held by the company or its qualifying individual, not a subcontractor
Red flag: Any company that cannot immediately provide a license number, gets defensive about the question, or says they "do not need one" for the work you are requesting. In NC, virtually all HVAC installation and repair work requires licensure.
At Air Support Heating and Air, our HVAC license (#35324) and electrical license (#12879) are always available for verification.
2. "Do You Carry Insurance -- Both Liability and Workers' Comp?"
An HVAC company should carry at minimum:
- General liability insurance (protects your property if they cause damage)
- Workers' compensation insurance (covers their employees if injured on your property)
What to look for:
- Ask for a Certificate of Insurance (COI) -- any legitimate company will provide one without hesitation
- Verify the policy is current (check the effective and expiration dates)
- Confirm the coverage amounts are adequate (at least $1 million in general liability)
Red flag: "We're covered, don't worry about it" without providing documentation. If an uninsured worker is injured on your property, you could be held liable. This is not a question to skip.
3. "How Long Have You Been in Business Locally?"
Experience matters, but local experience matters more. An HVAC company that has been serving the Wilmington area understands:
- Our coastal humidity challenges and salt air corrosion issues
- Local building codes and permit requirements specific to New Hanover, Brunswick, and Pender counties
- The soil and drainage conditions that affect equipment placement
- Which equipment performs best in our specific climate zone
What to look for:
- At least 2-3 years of established local operations
- Verifiable local references and reviews
- Physical address in the service area (not just a P.O. box)
Red flag: Companies that just appeared after a storm or that operate out of a different region and are "expanding" into your area. These fly-by-night operations are responsible for a disproportionate share of complaints to the Better Business Bureau (BBB).
4. "Will You Pull the Required Permits?"
In New Hanover County and surrounding areas, HVAC installations and significant repairs require building permits. The permit process ensures the work meets code and will be inspected by a county official.
What to look for:
- The company should confirm they will handle permit filing as part of the job
- They should schedule and be present for the inspection
- The permit should be pulled in their name (some disreputable companies ask homeowners to pull their own permits, which shifts liability to you)
Red flag: "We don't need a permit for this" on a system installation or major component replacement. They almost certainly do, and skipping permits can create serious problems when you sell your home -- unpermitted work often must be redone or can kill a real estate transaction.
5. "Can You Provide a Detailed Written Estimate?"
A professional estimate should include:
- Specific equipment make, model, and size -- not just "a new 3-ton AC"
- Itemized labor costs with a clear scope of work
- All materials and parts included in the price
- Permit costs if applicable
- Warranty terms for both equipment and labor
- Timeline for completion
- Any exclusions or items that could result in additional charges
What to look for:
- The estimate should be in writing and signed by a company representative
- It should be valid for a stated period (typically 30 days)
- Multiple options at different price points are a sign of a company that wants to help you make an informed decision, not just sell you the most expensive system
Red flag: Verbal-only quotes, vague pricing like "around $5,000," or high-pressure tactics like "this price is only good today." These are classic signs of a company that does not want you to comparison shop.
6. "What Brands Do You Install, and Why?"
Every HVAC company has preferred brands, and their answer to "why" tells you a lot about their approach:
- Good answer: "We install Daikin because their warranty support is excellent, the equipment performs well in humid coastal climates, and we have a direct relationship with the regional distributor for fast parts availability."
- Bad answer: "We can install anything" (often means they do not have a deep relationship with any manufacturer and may not be factory-trained on the equipment they install)
What to look for:
- Factory training or certification in their primary brand(s)
- A clear explanation of why they recommend specific equipment for your situation
- Willingness to discuss alternatives if you have a brand preference
7. "Who Will Actually Be Doing the Work?"
This question catches a lot of companies off guard. Some HVAC companies subcontract their installation work to independent crews, which means:
- The people in your home may not be employees of the company you hired
- Quality control is harder to maintain
- Accountability is muddied if something goes wrong
What to look for:
- Confirmation that company employees will perform the work
- Technicians are background-checked and drug-tested
- Lead technicians are NATE-certified (North American Technician Excellence) or hold equivalent credentials
- The company provides uniforms and marked vehicles (professionalism signals)
Red flag: "We use independent contractors" or "it depends on who's available." You should know who is coming to your home before they arrive.
8. "What Does Your Warranty Cover -- and What Doesn't It?"
Warranty terms vary dramatically between companies. You need to understand:
- Equipment warranty: This comes from the manufacturer (typically 5-10 years on parts, sometimes with extended compressor coverage). Ask whether the company registers the warranty on your behalf -- many manufacturers offer longer warranties if the product is registered within 90 days of installation.
- Labor warranty: This comes from the installing company and covers the cost of labor to diagnose and replace failed parts. This is where companies differ most -- some offer 1 year, others offer 5-10 years.
- Workmanship warranty: Covers issues caused by improper installation (refrigerant line connections, electrical work, drainage, etc.)
What to look for:
- A minimum 1-year labor warranty on installations
- Clear documentation of what is and is not covered
- A warranty that does not require you to purchase a maintenance plan to stay valid (though maintenance plans are independently valuable)
Red flag: Companies that are vague about warranty terms or only discuss the manufacturer warranty while glossing over their own labor guarantee.
9. "Can I See Your Reviews and References?"
In 2026, there is no excuse for an HVAC company not to have a robust online review presence. Check:
- Google Business Profile: Look for volume (100+ reviews is a good sign) and recency (reviews from the past 3 months show active, ongoing service)
- BBB rating: Check for complaints and how they were resolved
- Social media: Facebook, Instagram -- do they engage with their community?
- Ask for direct references: A company with nothing to hide will happily connect you with recent customers
What to look for:
- A 4.5+ star average across a significant number of reviews
- Thoughtful responses to negative reviews (every company gets a bad review eventually -- how they handle it matters)
- Reviews that mention specific technicians, quality of work, and fair pricing
- Local references you can actually contact
Check out our customer reviews and our team to see what Wilmington homeowners say about working with Air Support.
10. "Do You Offer Maintenance Plans?"
This question is less about whether you want to buy a maintenance plan and more about what it reveals about the company. A company that offers well-structured maintenance plans is signaling that:
- They are planning to be in business long-term
- They believe in the value of preventive care
- They want an ongoing relationship with you, not just a one-time transaction
- They are confident enough in their work to keep coming back to check on it
What to look for:
- Plans that include at least two visits per year (spring and fall)
- Clear pricing with no hidden fees
- Priority scheduling and repair discounts for plan members
- Transparent terms that let you cancel if you are not satisfied
Bonus: Trust Your Gut
After asking these 10 questions, you will have a clear picture of which companies are worth hiring. But do not underestimate your instincts. A good HVAC company:
- Shows up on time for the estimate
- Listens to your concerns before recommending solutions
- Explains options clearly without pressure
- Treats your home with respect (booties, drop cloths, clean work areas)
- Follows up after the job to make sure you are satisfied
Air Support Heating and Air: Ask Us Anything
We welcome every one of these questions -- and we are proud of our answers. Air Support Heating and Air is a veteran-owned, locally operated company serving Wilmington and the surrounding coastal communities. We are fully licensed (#35324 HVAC, #12879 Electrical), insured, and committed to transparent pricing, quality workmanship, and earning your trust on every job.
Want to put us to the test? Call (910) 469-1459 or schedule a free estimate online. Visit our About page to meet our team, or read what our customers say on our Reviews page. We look forward to earning your business.