Contact

Questions, corrections or ideas for a new calculator are welcome.

Email

Write to contact@homebtu.com. We usually reply within two business days.

Helpful details to include

• The calculator and the values you entered
• The result you expected and why, for example a contractor's Manual J or a manufacturer's data sheet
• Your state or climate zone

What we cannot help with

We cannot recommend contractors, give quotes or diagnose a specific system. For safety issues such as a gas smell or carbon monoxide alarm, leave the house and call your gas utility or 911.

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