Free HVAC Tools & Calculators
Empower your HVAC decisions with our suite of free, easy-to-use calculators and guides.
BTU Calculator
Calculate the right size air conditioner for your room.
Estimated BTU
Your recommended air conditioner size will appear here.
BTU Sizing Considerations
- Undersized units will struggle to cool your space adequately, running constantly and increasing energy costs while failing to maintain comfortable temperatures.
- Oversized units will cool the space too quickly without removing humidity, creating a cold but clammy environment and frequent on/off cycling.
- Room usage matters: Kitchens need ~4,000 additional BTUs, while bedrooms or rarely used rooms may need 10% fewer BTUs than calculated.
- Multiple heat sources like computers, appliances, or large numbers of occupants require additional cooling capacity.
- Professional assessment is recommended for complex layouts, multi-room installations, or homes with unique architectural features.