What can cause HVAC compressor to sweat and discharge to be cool?

Question

The high pressure line is cool leaving the compressor and the compressor is sweating. The unit is still cooling the home and is approx. 4yrs old.

Answer 1

Well the sweating is condensation kinda like a cold beer can on a hot summer day.  The unit uses refrigerant that absorbs the heat in your house threw the evaporator coil and discharges it threw your outside condenser coil.  Heat is attracted to cold so the low boiling point of refrigerant is squirted into your evap coil threw a cap tube and it boiling off makes it cold and attracts the heat.  It is hot when it hits the condenser so the outside temp is cooler and releases the heat.