Frequently Asked Questions
Quick answers to common questions about WattWise
Are WattWise calculators free to use?
Yes, all calculators and tools on WattWise are completely free. No signup, no email required. Your data stays in your browser.
Is my data saved on your servers?
No. All calculations happen in your browser. Any data you enter is stored locally on your device using localStorage. We never see it.
How accurate are the savings estimates?
Our estimates are based on national averages and generalized assumptions. Actual savings depend on your specific home, climate, utility rates, and usage patterns. Use our numbers as a starting point, then consult a professional for precise calculations.
Can I export my calculation results?
Yes. Every tool includes an export function that generates a PDF report of your inputs and results. You can also save calculations to your browser's local history for comparison.
Do you offer professional energy audits?
No. WattWise is an educational resource only. We do not offer professional services or consultations. For a real energy audit, hire a certified auditor in your area.
How do I clear my saved calculations?
Each tool has a Reset button that clears the current inputs. To clear all saved history, use the Clear History button in the tool's history panel, or clear your browser's localStorage data.
Why do you show ads?
Advertising helps us keep WattWise free. We use Google AdSense and participate in affiliate programs for energy-related products. We do not sell your data to advertisers.
Can I share my calculation results?
Yes. After calculating, click the Share button to copy a summary to your clipboard, or download the PDF report to email or print.
What data does WattWise collect?
None. We do not use cookies, trackers, or analytics. Every calculation runs entirely in your browser using JavaScript. We have no server-side processing for the tools.
Can I use these tools for commercial properties?
The calculators are designed for residential homes. Commercial buildings have different load profiles, rate structures, and equipment. For commercial audits, hire a professional.
How often are the calculators updated?
We update tax credit rates, utility rate assumptions, and national averages at least once per quarter. The underlying physics and engineering formulas remain constant.
Who writes the articles on WattWise?
All articles are written by James Patterson, a certified home energy auditor with 25 years of experience in the utility industry. Stories are based on real audits with names changed for privacy.