Free Heat Load Calculator cornerstone of every successful HVAC project—whether you’re engineering a new building, upgrading old systems, or aiming to enhance energy efficiency. To simplify your workflow, BuildMEP presents an intuitive Excel tool inspired by industry-standard Carrier E20 methodology, trusted by engineers worldwide.
Why This Tool is Good
Professional-Grade Calculations
Designed for engineers, consultants, and students, this Excel file provides precise calculations for both sensible and latent heat, in a familiar and reliable format.No Paid Software Required
All you need is Microsoft Excel—no expensive licenses or subscriptions needed.Transparent and Customizable
Every calculation is visible and editable. Tailor the tool to suit your project or regional standards.
What’s Inside the Sheet
Input Section
Project details: building dimensions, wall and glass areas, insulation values, occupancy levels, and climate conditions
Clearly labeled fields for ease of use
Sensible Heat Load
Calculates solar gains, transmission through building envelope, internal loads from lights, equipment, and people
Latent Heat Load
Estimates moisture load from occupants and outside air
Ventilation & Fresh Air
Integrates recommended outdoor air changes per ASHRAE or your local standard
Total Cooling Load
Outputs total capacity needed, in both BTU/hr and refrigeration tons
Built-in Safety Margin
Easily adjust safety factors to ensure reliable system sizing
The tool combines all the major steps from traditional E20 worksheets into a single, easy-to-follow Excel file—complete with formula explanations and user tips.
How to Use
Download and open the sheet in Microsoft Excel.
Enter your project details—dimensions, insulation, occupancy, climate, etc.
Review the calculated results—including detailed sensible and latent loads.
Adjust safety margins if needed, based on project requirements.
Use the summary to inform system selection and client reports.
Why Use This Over Other Tools?
No hidden calculations: Everything is visible and modifiable.
Greater accuracy than “rule-of-thumb” estimators: Accounts for real building conditions, not just area.
No expensive software: Open and affordable for all.
Perfect for education, consulting, and project submittals.
Exclusive BuildMEP Features
Customizable climate data: Enter values for your location—ideal for global projects.
Step-by-step instructions: Guidance for both new and experienced users.
Sample project included: See a real example calculation for an office space.
Modern, clean layout: Easy to read and present.
Download Now
Get your free BuildMEP Heat Load Calculator (Carrier E20 Style):
No sign-ups or paywalls—just a free Excel sheet and quick-start PDF guide.
Who Is This For?
Mechanical engineers and HVAC designers
Contractors and consultants
Students and educators in building services
Facility managers needing transparent load verification
What Users Say
“This tool made load calculations simple, transparent, and quick for our design team.”
“I especially appreciate the instructions and the sample project.”
Start Your Project Right
Take control of your HVAC sizing—download the BuildMEP calculator and experience clarity and confidence in every project.
Need the tool customized for your workflow, or want to request new features?
Contact the BuildMEP team—we’re here to support your engineering success!
