🛠️ Free Tools Hub
Free HVAC Tools - No Login Required
Calculators, workflows, and reference charts built for field technicians.
CalculatorsWorkflowsReference
Calculators
BTU Calculator
Estimate cooling capacity for any room size in seconds.
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Charge Calculator
Superheat and subcooling calculator for precise system charging.
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Duct Calculator
Determine duct size based on CFM and friction rate.
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Unit Conversions
Quickly convert temperature, pressure, and airflow units.
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Pressure Chart
Refrigerant pressure/temperature reference for field use.
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Invoice Generator
Create professional invoices with line items and tax.
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Quote Generator
Build professional proposals with pre-loaded HVAC pricing.
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Estimate Generator
Create Good-Better-Best estimates with markup calculator.
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Parts Database
Search parts by brand, model, and cross-reference.
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Job Calendar
Plan service visits and organize your week.
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