Rooftop unit service at dusk

This clip has music and no narration. What it shows:

• 0 to 0. A technician's arm holds a brazing torch to the copper piping inside an open rooftop unit, at sunset.
• 0 to 0. The technician works at the unit's open compressor compartment; the copper piping and compressor are seen up close.
• 0 to 0. The technician connects refrigerant gauges and cylinders to the rooftop unit as the light fades.
• 0. A close-up of a brass valve and the copper connections.