Where is my registration key?

If you received your kit as a participant of a utility program you don't need your registration key.

If you purchased your kit from or, you can find the reg key on the front page of your printed materials, on a small piece of paper the size of a business card. The registration key is a 25 character hexadecimal unique identifier and is required to create an account on or with the ThinkEco smartAC smartphone app. It's not case sensitive and there are no O’s, only zeros. The "Quick Key" requested when signing up in the app are the first 5 characters of your full registration key.

If your order does not include a registration key, please contact support with your order information and your registration key will be provided.
If you need to exchange a modlet
please do not return the registration key, as the replacement shipment will not include a new registration key.

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