Hello from Florida! I'm helping a relative with pool plans and am tying to do it on a budget. The plans they have are for a 16X23 foot pool. They are saying they would like a pool ledge(for lounge chairs) and I think that would be helpful to keep their operating costs down in the future. My relative isn't interested in solar heat although I think that would be a good idea for cost savings. I've also been told that solar will only heat 10 degrees higher than the air temperature. Although the water temp wouldn't be bad during the day, I know they will want to swim at night and I'm concerned that it will be cold. My family has a pool and it has a heat pump. We swim daily and at night and keep the pool very warm. Some months the bill has been very high. They are going to retire in 5 years and I'm concerned about the operating costs in the future. Any advice is appreciated!