Hi...Yes, the pool may be a little warmer, but the way the pool faces is actually not a problem if heated. I think the main reason that south facing is a benefit is the morning sun on the deck around the pool. So if you sit on the deck at 7 to 10 AM you will get the morning sun. Pools facing the other way will get the sun as the day progresses and in the early evening.....Some people really want the morning sun.....never make much difference to us....
Take care...Ted