Chillers: What HP to Get?

[Enigma]

Thank you!

Our crummy old house heats up like an oven in the summer. Murphy's Law being what it is, if we get a temp spike it'll be while my eldest is here trying to manage things for that week.

[Enigma]

I got a very fair deal on a JBJ Arctica 1/5hp chiller off of Kijiji. I love it. While it may be overkill size wise, it was such good value that I couldn't pass it up. It is very quiet and is doing a very good job at keeping my tank below 79F.