With Tado announcing 1m units of its smart thermostat sold last week, a thought occurred to us. As Big Tech muscles its way into every corner of the smart home, it is increasingly surprising that Amazon lacks a smart thermostat in its arsenal. Amazon’s acquisition of such a company has long been overdue, but the tech giant has inexplicably held off. Following its acquisition of Ring and Blink, a thermostat seems to be one of the final pieces of the smart home puzzle – and one of the most obvious advantages that its chief-rival Google has, which gives Google almost direct access to the utility market. There are two smart thermometers which Riot believes are the most likely acquisition targets…