Here are some of the things you will need to start your HVAC business:Local Business License: First, check with your local authorities. You might need a business license before you can do anything.State Contractor’s License: You also need a Contractor’s License. To qualify, you will need proof that you have the minimum amount of HVAC experience required by your state. …HVAC Contractor’s License: Once you pass, you’ll file for your HVAC Contractor’s License and pick a name. …Contractor’s Insurance: At a bare minimum, you need to carry liability insurance so that you are covered if someone injures themselves on your job site. …Contractor’s Bonds: Your HVAC business will also need a bond. This is used to secure your jobs in case someone complains about the quality of your work.