A & L Furniture Co.
1038-08
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Use synthetic, especially polypropylene, rope as it is best for swings. It is stronger than natural rope and has better weather resilience.
You will need 3/4″ or 1″ to hang a swing. If your ceilings are very tall, you will need to measure your ceiling and add about 6″ for knotting.
It would be a terrible idea to use climbing rope for the porch swing. However, if you mean as an activity, you can add some knots to make the climbing rope thicker and then swing on it.
To prevent a rope from rotting, keep it dry, avoid storing it in a hot car trunk, and keep it away from chemicals. You can also add 10-15% of the required length for the shrinkage.