I would think that leaving the unit in standby would be enough to keep the unit's DAC circuits warmed up. From what I've read (and experienced), DACs can be sensitive to this, primarily the clocks. To perform properly, they sometimes need up to 24 hours to thermally stabilize. They take a long time to do so because they're small and don't use a lot of power unlike amplifiers. I highly recommend not fully powering down the unit. Also, because the amp is class D, it isn't really doing anything when a signal isn't present. Unless you think you might have the IDA16 for 20+ years, I wouldn't worry about shortening the lifespan even if the unit is left on. If you run into any issues, I'm certain the folks at NuPrime will be there to take care of you.