Walk away from an HVAC contractor who won’t give you a state license number, quotes a replacement without a load calculation, suggests skipping the permit or offers a discount for cash, pressures you to sign today, or can’t put the warranty and scope in writing. Any one of these is a reason to pause; two or more is a reason to call someone else.
No license number, or a number that doesn’t check out
Every legitimate North Carolina heating and cooling contractor has a license from the state board and knows the number. Offering a business license, a bond, or an EPA card in its place is not the same thing. If the number they give leads to a different company or an inactive record, stop. How to check a license.
Sizing by eye
“You’ve got a three-ton, so we’ll put in a three-ton” is the most common and most expensive shortcut in residential HVAC. Proper sizing uses a load calculation for your house as it is now. In a humid climate an oversized system cools the air quickly, shuts off before it dehumidifies, and leaves the house clammy while cycling itself to an early death.
Skip the permit, pay cash
Both mean the job won’t be inspected and often means the contractor doesn’t want a record of it. Permits protect you: an inspection catches the electrical, gas and refrigerant errors that show up as failures years later, and unpermitted work can complicate insurance claims and a future home sale. Cash discounts specifically to avoid a paper trail belong in the same category.
Pressure to sign today
Legitimate seasonal promotions exist. A price that is only good “while I’m here”, a discount that disappears if you get another quote, or a technician who moves straight from a repair diagnosis to a full replacement pitch with the sales manager on the phone are pressure tactics. A contractor confident in their price and work will let you get three quotes; the 3-quote method exists for exactly this.
Vague scope, vague warranty
If the quote doesn’t list model numbers and what’s included, or the warranty is described in conversation but not on paper, you don’t know what you’re buying. Ask for it in writing; a contractor who won’t provide it is telling you how a warranty claim would go.
Diagnosis you can’t verify
For repairs, ask what specifically failed and how they know. “The compressor’s shot” should come with a reading; “you’ve got a refrigerant leak” should come with where. If a repair call turns into a replacement recommendation on the spot for a system under 12 years old, get a second opinion before you decide.
Reviews that don’t add up
A flood of five-star reviews in a short window with generic text, or reviews that mention services the company doesn’t offer, are signs the profile has been managed rather than earned. Read the three-star reviews; that’s where the pattern shows.
What to do instead
Start from a source that has already checked the public record. Every contractor on the registry shows the license status we found and the date we found it, and the Airworthy Verified badge means the license, insurance and review threshold have been checked. Then ask the six questions and get three written quotes for any replacement.