Here is some information on how to register and start an HVAC business in the state of New York.  HVAC services can include heating, ventilation, air conditioning, refrigeration, and more.  You may want to start here:  How To Start An HVAC Company.  Make sure you do your own thorough research, as laws change regularly.  Here are some steps you may have to take (not necessarily in order) to start your own HVAC company, along with links to more information.Getting started– The state of New York has a website about starting a business here: New York Business Express-Select your business structure.Sole-proprietor, LLC, Partnership, Corporation, etc.-Register your business name.You need to register your HVAC business name:  Certificate of Assumed NameIf you need help selecting a name for your HVAC business:  HVAC Business Name Ideas-Register your business.You can find out more about registering your HVAC business with the state of New York here: Start a Business in New York-Open a Business Checking Account.You will need to open a separate bank account for your HVAC company with your new business name.-Find out about taxes and hire an accountant.You may want to file your own taxes if you are a small company. As you grow, it will be easier to have an accountant do the work. More info about taxes here:-Get Liability Insurance.You will need liability insurance.  Be sure to check will multiple agents as prices and options vary.-Register as a Contractor.You will need to check with your county to see requirements for registration.-Worker’s Compensation.You will need Worker’s Compensation if you have any employees.-Get Health Insurance.Since you will be self-employed, you will need your own health insurance.  If you have employees, you will need a plan that will include their health needs also.-City License.You may be required to obtain a license to operate your HVAC business in a particular locale, whether you are a resident, or not.-Permits.Depending on the locale, you may need to apply for permits before commencing certain types of HVAC-related jobs.-Building Code and Inspections.You must be aware of building codes for your particular job, and may be subject to inspections.-OSHA.Depending on how many employees you have, you may need to follow OSHA regulations.-Financing.Depending on your startup budget, you may need to apply for financing to help pay for equipment.-Marketing.To get your HVAC business going, you will need to either do your own marketing, or hire a marketing agency.