🌡️ HVAC BTU Calculator

What Is BTU & Why It Matters

BTU stands for British Thermal Unit — it's a way to measure how much heat an air conditioner or heater can move. Choosing the right BTU size ensures your room stays comfortable without wasting energy.

How This Calculator Helps

Instead of guessing, this calculator gives you a solid estimate of the BTU capacity you need based on your room’s size, insulation quality, sunlight exposure, and number of people in the space.

When to Use It

• ❄️ Buying a new AC or heater
• 🏠 Renovating or finishing a basement or attic
• 🔧 Planning HVAC installations

Pro Tips

• 🌞 Sunny rooms may need extra cooling power
• 🧥 Well-insulated rooms retain heat better, requiring fewer BTUs
• 👨‍👩‍👧 More people in a room = higher cooling needs

A properly sized unit runs efficiently and lasts longer. Use this tool to avoid under- or over-sizing your HVAC system.