A smart thermostat install typically runs $150–$400 including the device. The device itself is $130–$280; the rest is labor and setup. Many are DIY-friendly if you have a C-wire.
What drives the price
Thermostat model
C-wire present or not
HVAC system compatibility
Setup and app configuration
Red flags in a quote
$400+ for a basic programmable stat
No compatibility check with your system
Charged 'smart home integration' vaguely
Didn't ask about your C-wire
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