Whether you are a grassy green, brand new, junior HVAC technician trying to convince your first customer that they really do need to replace that six year old, hair encrusted air filter for ten dollars, or you're a full time, briefcase carryin', bowtie wearin', dyed in the wool snake oil salesman, trying to close the deal on a ten ton, 86 SEER, 4 stage, tri-fuel super heat pump with duel flux-capacitors in a single-wide trailer park, you have probably never been taught the basics of how to sell anything. One day a supervisor of yours just said "Jack's out today, so I need you to get over to...