Mixed Air Temperature Calculator

🌀 Free Mixed Air Temperature Calculator (HVAC Tool)

Easily calculate Mixed Air Temperature (MAT) for HVAC systems with this free, ready-to-use Excel tool. Perfect for technicians, engineers, students, and contractors, this calculator helps you understand how outside air and return air combine inside your system.

✅ Features:

• Enter Return Air (RA), Outside Air (OA), and % Outside Air to instantly calculate Mixed Air Temperature
• Automatic output of % Return Air and MAT
• Scenario table from 0% to 100% OA in 10% increments
• Built-in chart to visualize how MAT changes as OA increases
• Notes section with guidance on dry-bulb vs. enthalpy control and when to use each method
• Simple, intuitive design—no advanced Excel skills required

⚠️ Disclaimer:
This calculator uses dry-bulb temperature averaging, which assumes a dry coil condition. In humid climates or when cooling coils operate wet, latent heat removal becomes significant, and an enthalpy-based approach is more accurate. This tool is provided for educational purposes only and should not replace professional engineering judgment, ASHRAE standards, or local code requirements.

📥 Download Now — Free
Use this calculator to strengthen your HVAC fundamentals, practice real-world scenarios, or train new team members.