Chiller maintenance time - annual cleaning and checkup

[brisco]

I have chiller envy...I am currently chillerless and instead use the old COMPLETE PANIC method when my tank temp goes up in the summer! I use LED lighting so it isn't outrageous, but would love to get a chiller before the summer. Any clue to how much hp to get? 100 Gal DT with 25 Gal sump with a mixed reef.