
HVAC Logic
OhmNexus
HVAC-Calc
Omni Calculator
Solve Elec
HeatPumpWise
Engineering Equation Solver
Free, accurate engineering calculators for HVAC, Electrical, Plumbing, Construction, Mechanical, and Manufacturing professionals. Instant results with metric and imperial units.

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Transparent, peer-reviewed engineering calculators for HVAC airflow, duct sizing, cooling loads, heat pumps & field diagnostics. 100% free & client-side.
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OhmNexus is a platform of electrical calculators, design tools, guides and professional services for engineers, electricians, students, and makers. Every calculator and tool is engineered for accuracy and built on the NEC, IEC and IEEE standards.
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HVAC-Calc: The Heat Gain Heat Loss Calculator 1-888-736-1101, only $49 for do-it-yourself
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Helping you make rational decisions, one calculation at a time.
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Solve Elec is a free educational program to draw and analyze electrical circuits.
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Free heat pump calculators and guides for sizing, installation cost, operating cost, savings, rebates, balance point, mini-splits, water heaters, and pool heating.
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