The foam insulation around the suction line on my ac has deteriorated, so I covered it completely with tape. Was this an OK thing to do. Am I harming anything? I have not run my AC since I did this.

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    The purpose of the foam is to prevent water from condensing on the cold pipe and then dripping; not good on attic insulation. I would replace the plastic foam . – blacksmith37 Sep 2 '18 at 20:31

Generally speaking, if you need to tape something HVAC you should use foil tape, not other tape. While it won't "harm" anything to use other tape, foil tape is made from metal so it forms a new solid connection.

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