ComEd, the largest power provider in Illinois, wants to give its customers a hand in switching over to smart thermostats like those from Nest and Ecobee. The idea is to get a million of them installed within the next five years, according to The Washington Post. The utilities company is offering $120 rebates to its customers who buy the gizmos and the Environmental Protection Agency tells WaPo that it's the "largest effort of its kind" in the country. ComEd likens the push to switch to the connected thermostats to the not-that-long-ago transition to compact fluorescent bulbs in terms of energy savings. Should the program be a success, it could drop total carbon dioxide emissions in the state by 709,000 metric tons and save folks up to $131 per year on their gas and electricity bills.