I have my a/c vent pointing towards my tank. That's pretty much it. we keep the apt set at 70°F all the time so directly hitting the tank it gets down to 66 with daytime high of low-mid 80's. I guess its probably not the most consistent way to do it but then again neither is nature.
Friendship is like peeing on yourself: everyone can see it, but only you get the warm feeling that it brings.
Sounds like a good simple system to me.