Entry level heating and air-conditioning jobs?

Not sure what you are asking for. But I started out as a driver delivering parts to the mechanics on the job. Then I was a helper , then I started going out on my own to the smaller easier accounts and up from there. I will offer the good fortune of my experience to you,. See if the UA (United Asssociation) is active in your state and contact the nearest Local office to see when they will be recruiting their next class of apprentices and apply at that time. Being UA trained has allowed me to go quite far in my 25 years in the HVAC trade. But remember it is like anything else, you only get out what you put in, so I will take some of the credit for my success. But being a UA trained Tradesman if they are a presence in your State is definitely the way to go.