Do not be discourage comrade.

For 5500sq ft house you can actually built a decent size pool. Keep it small to reduce maintenance charges (as you can do it yourself) You can use it primarily as a wading pool, to soak in on hot days at the same time you can install a swim jet for swimming excercise. It'w will fit these criterias:
1) Cooling down on hot days with a drink in hand
2) Reasonable installation price (25k-40k depending on size)
3) Can do self maintenance
4) Can also use for swimming excercise with a swim jet (prolly cost anothe 5k-10k)

Trust me as i have done it before not talk only like many others..... cheers.