I am having a graduation party in May, and my pool tends to be cold at this time of year. It usually sits around 63-66 degrees. I would really like people to be able to swim at the party, and the only way I realistically see that happening is if I can get the pool up to at least 70, possibly approaching 75 degrees.

Does anyone have any advice on how I can do this without spending thousands on a heater? Ideally, I would spend as little as possible with as much benefit as possible.

I know that solar covers work, but in the past they have only increased our pools temperature by around 2 degrees. It's a start, but is there anything else I can do?

Thanks so much!!!