"ComEd will mail you a $100 check if you purchase and install a Nest Learning Thermostat. You can get up to two thermostats per household. This rebate is available until approved ComEd rebate funds are exhausted or May 31, 2017, whichever comes first. You'll need to have an active ComEd residential account and a central air conditioner, electric heat or heat pump. See all the details."