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Leverage our free spreadsheet-based Manual S tool for variable capacity heat pumps

Variable speed heat pump Manual S tool

Background on how CFMs are calculated and how they should (and should not) be used

Approximate airflow CFMs for cooling or heating

With a mixed application, you still only need a single Manual J. Here's how to do it.

How to model a mixed ducted + ductless system

Eric Fitz

Manual S, and other special considerations for both ductless and ducted systems 

Advanced design & Equipment Selection

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