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HVAC
Reference for air source heat pumps: ducted, ductless, COP ratings, and cold climate.
Open Air SourceYour specific task is calculate air changes per hour from airflow cfm and room volume. Open the page, drop your input, get the result — typically under a second.
Your goal is reference for air source heat pumps: ducted, ductless, cop ratings, and cold climate. 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. ACH Calc focuses on calculate air changes per hour from airflow cfm and room volume; Air Source focuses on reference for air source heat pumps: ducted, ductless, cop ratings, and cold climate. 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 ACH Calc and Air Source work without signup. We only ask for an email if you decide to subscribe to a paid plan.