Can I Open Up My Own Business With A Certificate In Air Condition, Heating And Ref. Technology?

Are you licenced or just went to school and got a certification? Most states will require you to be licenced and bonded. I am a licenced A/C contractor in the state of Arizona.
And here they will let you service units under something called the handyman clause. Which allows you to do repairs up to $1000. But it is best to be licenced. It will open up so many more doors for you. I do alot of extended home warrantee work. Have been self employed since 1981. You will also need your EPA certification to purchase and handle refrigerants. Let me know if I can be of further assistance. Good Luck!