first off, leaving water sit out no longer works to remove chlorine, as they have changed to chloromine, which is not a gas like the old days. Chloromine is removed by charcoal filtering or ascorbic acid (vitamin C).
second, chlorine "IS" one of the 16 elements plants use/need
third, chlorine helps soften the seed shell making it easier to pop, it also helps with rooting cuttings.
forth, add a bit of H2O2 (peroxide) to it to speed things up
Room Temp is good