Before jumping from algo to algo, maybe consider that if an algo keeps the gpus cooler that mean that the miners is still not optimized and is not using your gpu full potential.
We saw few modifications for all know "low" temp algos (x11-x99, nist5) and they all bring the temps around scrypt level.
I personally enjoy nist5, cause the original miner keeps the temp of my workstation gpu quite low and I can work/watch movie/ run several VMs while mining.
Of course on my rig I use the optimized miner by djm34 and temp are at 72-75, but with double hash rate.
If you want to run an algo that consumes less energy, scrypt and sha-256 will be your right choice, cause ASICs consume less than GPUs.