The #1 psychrometric chart software tool in the world used by 20,000+ engineers.
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HVAC noise prediction and acoustical analysis.
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Commercial and residential HVAC load calculations.
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... and many more desktop apps. Click here for the entire list.

Hands Down Software was founded in 1987 and developed the first Windows version of an interactive psychrometric chart called HDPsyChart in the mid-1990s. Since then, over 20,000+ engineers, manufacturers, data center managers, and building owners have relied on this software to design comfortable, safe, and energy efficient spaces and buildings.

In the Spring of 2024, Carmel Software acquired Hands Down along with the psychrometric chart and other software tools. Click here for details on that acquisition.

In the Spring of 2025, Hands Down released the first update to HDPsyChart in almost a decade. Introducing: HDPsyChart V9!