Contact

The quickest way to reach us is email: hello@sizesums.com.

Helpful things to include

• A wrong answer? The calculator, your ZIP code, the numbers you entered and the result you expected.
• Climate data that looks off? Your ZIP code and the zone or design temperatures you expected, with where they came from.
• A new calculator? The equipment you'd like to size.

Business details

Data Dingo (NIP 8942982912)

We read every message and usually reply within a few days. We never sell or share your email address; see the privacy policy.