Honestly, the problem is not just that the Nest thermostat and smoke detector are expensive... I could (almost) justify spending $200 on a thermostat or smoke d

Honestly, the problem is not just that the Nest thermostat and smoke detector are expensive... I could (almost) justify spending $200 on a thermostat or smoke detector once. But I have 9 heating zones and approximately 9 rooms that need smoke detectors. You know what I'm not doing? Spending $1800 on thermostats for my house. Hell, I haven't even replaced all the old spring-loaded mercury-filled thermostats from the 80's when the house was built. If I could buy one Nest, and 8 remote receiver thingies for like $10 each that just report wirelessly to the Nest, then I might actually buy one.