[biosurfer1]

I'm familiar with HVAC units, just not diagnosing repairs on them.

I have a split system with the furnace in my attic and towards the end of the summer season last year I noticed some discoloring on my ceiling in my room. I went to check out the unit and the was some dripping off the low side copper pipe coming from inside the unit, running down the outside of the pipe then dripping onto the insulation.

Whatever the liquid is, it is blueish green in color and I'm not sure what it is. Any idea what it is? I'll probably have someone come out and fix it since its getting hot now but thought I'd like to know what I'm dealing with before that happens.