Answer:
Sometimes yes, sometimes you can do it yourself
Explanation:
Installing a Nest thermostat can be done yourself without an electrician in most cases. Nest thermostats are designed to work in homes without a common (“C”) wire. However, there are rare cases a C wire or other power-supply accessory may be required. An electrician is recommended in these rare cases.
Meters * 1,000,000,000 = gigameters
Try resending it isn't there a button to resend the email? and look in spam
Answer: check the internet connection
Explanation: