Contact
One address, read by a person. There is no form here because a form would collect more about you than an email does.
Corrections
If a figure for your state looks wrong, say which state, which number, and what you believe it should be. A link to the source makes it far quicker to check and fix. Utility prices in particular move, and a reader with a bill in hand knows better than a national average does.
Requests
Tell us which calculator is missing. Heat pumps, insulation, home EV charging and appliance running costs are already planned; what gets built first is decided by what people ask for.
Press and business
Same address. Advertising here is bought through Google AdSense rather than direct, so there is nothing to negotiate on placements.
What will not get an answer
Requests to publish a guest post, to insert a link into an existing page, or to buy one. No page on this site carries a paid link.