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Your specific task is calculate air velocity in a duct from cfm and duct dimensions. Open the page, drop your input, get the result — typically under a second.
Your goal is reference energy star efficiency ratings for hvac equipment types. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Duct Vel focuses on calculate air velocity in a duct from cfm and duct dimensions; Energy Star focuses on reference energy star efficiency ratings for hvac equipment types. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Duct Vel and Energy Star work without signup. We only ask for an email if you decide to subscribe to a paid plan.