I think that the deal for a pi zero is still pretty unbeatable. I run one as a backup DNS at home if my primary goes down. With a poe splitter and a sensor unit

I think that the deal for a pi zero is still pretty unbeatable. I run one as a backup DNS at home if my primary goes down. With a poe splitter and a sensor unit (co2) it draws about 1w. That means about $2 a year where I live. My second best computer - a hp mini computer - draws 11w at idle. Meaning $22/year. At a service time of 5 years a pi does make sense.