What would cause my HVAC high pressure (skinny) line to be colder than my low pressure (insulated) line?

Question:Just looking for ideas to check for when a service technician comes out to look at my air conditioning. I know these guys are very busy this time of year and just want to be careful that I am not being taken for a ride as they tell me a whole lot of this that may not even be the problem so they could just charge more. Basically, my problem is if you feel the skinny high pressure line from my condenser unit outside it is colder than the insulated line and I don't think that is the way it should be. My neighbors high pressure line is hot, why is mine not? The cooling inside is doing okay but it feels as if it should be cooler. Also any advise on what else I could check for myself before I call the service tech would be greatly appreciated.

Answers:
its hard to say what your system is doing unless we had system pressures, superheat and subcooling readings. Does the air off the top of the condensor feel warm? it should be at least warm. Now your liquid line( skinny line) shouldnt be hot but it shouldnt be cold either, the heat is pulled from the refrigerant at the condensor and is cooled down back to a liquid state from a gas state, the temperature of the liquid will drop as it makes its way back to the indoor coil. You can check your temps in the house, you should have about an 18-22 degree split between the air returning to your unit and the supply air coming from the air registers.