I've artificially raised EBR and GBR frys in the past (8 years ago) and is currently working with 3 pairs of black ram. Currently I have my setup in the garage where the room temperature is between 80-90F and water temp can get between 81-86F. Since Southwest Florida is experiencing a "freezing" 60F overnight temperature this week, I'm running 2 Vornado Whole Room Heater and Fan that I bought from Costco, each rated for 300 sqft, to keep room temp at around 82-83F.
I don't do anything special with the water temperature. Water change is usually done with an aging water tank that I have in the garage as well so the temperature does not fluctuate. I do notice spawns usually happen around a storm or rain. I believe this is due to temperature (minimal)/pressure change similar to the raining season.