My Air Conditioning unit's drain line is connected to my bathroom sink (as usual). However, the cold water in the drain line is causing condensation on the outside of the P-trap... enough condensation that it drips when the A/C unit is really running in warm months. The A/C unit is right behind the wall of the bathroom, so the drain line distance to the p-trap is very short. Any ideas how to prevent this condensation? The dripping condensation is going to start damaging the sink cabinet.