I have a corner of the house that has a square lot suitable for building an addition, I had considered a patio, may still do that, but I'd love an indoor pool instead. There are a few home owners here who have installed a hot tub, with the walls, ceiling, and floor well insulated, so as long as the room is kept at a temperature of say 65F year round, there is no need to heat the pool water - just has to be filtered.
When I lived on the island of Harrington Harbour, every home had a basement cistern usually made of one of those above ground pools, because the community water supply was very uneven. If a better water supply were made available on the island (at present it's a series of huge outdoor cisterns collecting rainwater) then those indoor cisterns could be made into hot tubs, for example. [img]smile.gif" border="0[/img]