Since the EPA drove the price of aceylene thru the roof due to the acetone in the tank($65 last time I filled my 100cuft bottle, ), I use propane-oxygen, same tips and regulators, have even done straight copper welds (12AWG as filler rod) but not on hvac. Oxy propane works well with silphos 15%.
You can usually score an oxy-acet rig (regulators, torch, hoses) off ebay for under $60 total, any propane tank works, and you only need a small oxy bottle (another $50 or so, have gotten some off CL for $20))
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