BTU, or British Thermal Unit, is the standard measurement used to determine the cooling or heating power of an HVAC system. Choosing the correct BTU capacity is essential for ensuring your room stays comfortable without the system cycling too frequently. You can easily Sort by BTU on our website to find the right size for your square footage. A small room might only need a 9,000 BTU unit, while a large open area could require 24,000 BTUs or more. If you are unsure of what size you need, our HVAC Load Calculator provides an accurate estimate based on your room's dimensions. Oversizing a unit can lead to poor dehumidification, while undersizing it will leave the room feeling warm. We stock everything from compact 6,000 BTU models to massive 60,000 BTU systems. Always refer to our Technical Data to see the specific heating and cooling capacities of each series.