Know Your HVAC System -

Welcome to Our HVAC Load Calculation Resource Hub

We know that a well-designed HVAC system starts with accurate load calculations. Whether you're building a new home, renovating, or upgrading an existing system, proper load calculations are essential to ensure your HVAC system operates efficiently and effectively.

On this page, you'll find expert insights and detailed guides on the various aspects of HVAC load calculations, including Manual J (for heating and cooling load), Manual D (for duct design), and Manual S (for equipment selection). We cover everything from understanding the basic principles of heat transfer to the specifics of sizing systems for different building types and climates.

Our goal is to help homeowners, contractors, and engineers better understand the importance of precise load calculations in creating comfortable, energy-efficient living spaces. Stay tuned for tips, case studies, and best practices on optimizing your HVAC system’s performance.

Specialized Geothermal Manual J (Load Calculation) Division Grows Beyond Atlanta & Florida

Atlanta’s Load Calculations HVAC company, announced today that they opened a statewide load calculation service to respond to the needs of their geothermal and conventional heating and air conditioning contractors who are welcoming their assistance with open arms. Naples, FL, April 09, 2025 –(PR.com)– HVAC contractors across the country now have […]

Why a Manual J Load Calculation Can Save You Thousands on Your HVAC System

If you’re building a new home, renovating, or replacing your HVAC system, one of the most important steps is ensuring your system is properly sized. Surprisingly, this is also one of the most overlooked aspects of HVAC design. Improperly sized systems—whether too large or too small—can lead to long-term performance […]

Service Division in Florida Launches Nationwide HVAC Design Services Offering Manual J, Manual D, and Manual S Calculations

Cape Coral, FL – April 3, 2025 – A new industry resource is now available to HVAC contractors, builders, permit expediters, and homeowners across the United States: LoadCalculationsHVAC.com, a professional online service providing fast, accurate, and code-compliant Manual J load calculations, Manual D duct designs, and Manual S equipment sizing. […]

Tampa HVAC Manual J & Manual D Load Calculations

With a Manual J calculation, you will know the precise number of BTUs or British Thermal Units of heating and cooling your home requires.