google is your friend, thats what i found: For the entry level hvac equipment installer job, you will normally be required to purchase some specialized hvac tools. The basic toolbag will contain right and left handed snips in both straight and offset types, a tinner's hammer, seaming tongs (also called hand seamers), hand crimpers, hand notchers, and a snap lock punch. Other specialized needs will include an offset duct stretcher which is used to pull the ends of metal ducts close enough to get drive cleats started on them. You will also need various lengths of hand folding tools to prepare metal ducts for joining after they have been cut off. **HOT TIP** You can get a combo drive tool that includes a duct puller, folding tool, scribe, and ruler all in one. To work with ductboard or flex ducts, you will need a duct knife and a ductboard knife as well as a strap gun. Generally speaking, most employers will provide electrical testing meters such as a digital voltmeter and a clamp on ammeter as well as an infrared non-contact thermometer for service technicians. They will also normally provide a portable oxy acetylene torch, vacuum pump, refrigerant recovery machine, and refrigerant guages to both service technicians and installation technicians. and also this here: