As an HVAC Mechanic you will likely start out working for a company. Generally the company will assign you a partner and together you'll be assigned a work truck or van with equipment. Every day you'll start out at the office, and then you and your partner will drive to the assignment for the day. The job might be as small as going to a person's home to change a filter and check for maintenance needs that takes under an hour. The job might be as large new construction or full renovation of a housing development, office building, or apartment complex which takes multiple days. You and your partner will be responsible to make sure you have the equipment stocked in the truck for the day's work. It's nice that there is variety to the work, but it can also be a hot or messy job. You may have to work on a roof in the summer or in a crawl space. However it's skilled labor that is always in demand and can be a very rewarding career.