Very efficient

Timers make life easier. I have dramatically cut my utility bills by using a programmable thermostat to regulate the temperature. Sometimes that means I'll be working from home and thinking "Jesus, it's *cold/hot* in here..." and remember the thermostat is set to "Away" because I'm usually at work at that time of day. Then I get up and adjust the temperature and everything is A-OK.

Which is probably what somebody should have done here:

You might be having hard time seeing what's wrong with this picture, because it's hard to see sprinklers IN THE RAIN!