HVAC Pro: Load & Duct Sizing

About this app

Stop guessing and start calculating with professional precision. HVAC Pro is the ultimate mobile toolkit for HVAC contractors, engineers, and technicians. Whether you're in the field or in the office, our suite of 8+ professional-grade calculators ensures your heating and cooling designs are accurate, efficient, and compliant with industry standards. WHY PROFESSIONALS CHOOSE HVAC PRO: Designed with a modern, intuitive interface, HVAC Pro simplifies complex Manual J-style calculations into a few taps. Avoid costly callbacks and equipment oversized errors by getting the right data, every time. CORE CALCULATORS INCLUDED: • Heating & Cooling Load: Precise Manual J-style analysis based on building envelope, insulation, and climate zones. • Duct Sizing: Calculate round and rectangular duct diameters using friction rate and velocity methods. • Quick BTU Estimator: Rapidly estimate tonnage and BTU requirements by square footage for initial quotes. • Airflow & CFM: Determine required CFM for any room and calculate Air Changes per Hour (ACH). • Energy Cost Analysis: Compare operating costs for Natural Gas, Electricity, Propane, and Heating Oil. • Humidity & Infiltration: Factor in latent heat loads and air leakage for 100% accurate sizing. KEY FEATURES: • Climate Zone Precision: Built-in design temperatures and HDD/CDD data for all major climate zones. • Professional Reference: Quick access to ASHRAE standards, ventilation requirements, and insulation R-values. • Imperial & Metric Support: Switch seamlessly between unit systems. • Saved Calculations: Keep a history of your site audits and designs for quick retrieval. • Dark Mode Support: Easy on the eyes for late-night project planning. WHO IS THIS FOR? • Residential & Commercial HVAC Contractors • Mechanical Engineers & Designers • Home Inspectors & Energy Auditors • HVAC Students & Apprentices Download HVAC Pro today and carry the power of an engineering firm in your pocket. Build better systems, save energy, and grow your professional reputation.

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1. First observed Aug 7, 2026 · 12:53 AM $9.99