Can you give us a detailed case study analysis of the patient. Include symptoms of the cold (chills, fever, sweating, headache, dizziness, digestive/appetite/bowels, urination, sore throat), and most importantly, the pulse. Include all 3 positions on both hands. What level do you feel each of them (superficial/middle/deep). The level of the pulse can inform you as to how deep you can treat. The positions of the pathological pulses can also inform you as to which channels are involved, and hence which formula to use (e.g. A thin wiry pulse on the left guan points to Shao Yang, therefore a chai hu-based formula).
Are they always low energy or just now with the cold?