You would need a chiller for sure, well worth the extra power IMO. Trout like it vary cold like 55F or cooler for Brook trout.
The reason why they jumped out of the tank because they starts to not able to cope with warm temperatures.I had a few trout that i caught from a stream/ waterfall. I brought them home and rehomed them in my community tank at the time with my zebra danios and loaches. My temp was tropical temps from ranging from 76-81F and they were fine. They grew for a while and was able to live in tropical water for quite a while until one day they jumped out due to my mistakes. But it is possible without a chiller from my experience, I like to go against things and make the impossible, possible.
Gars are Illegal In California. Same with Bowfins, and pikes.