When it comes to choosing the right AC unit, most homeowners assume it's based on square footage alone—but that’s a common misconception. Proper AC sizing depends on cubic footage, not just square footage. Why? Because air volume, insulation, ceiling height, and airflow (CFM) all play a crucial role in determining the correct system size.
Improper AC sizing can lead to:
Let’s break down how AC sizing really works and why CFM (Cubic Feet per Minute) is the key to ensuring your home stays cool and efficient.
Most people assume a “rule of thumb” approach—like 1 ton of cooling per 500 square feet—is accurate. But this ignores critical factors like:
Instead of relying on square footage alone, HVAC professionals size AC units based on cubic feet of air that needs cooling.
CFM (Cubic Feet per Minute) measures how much airflow an AC system can handle. Proper airflow ensures:
The general rule is 1 CFM per square foot, but ceiling height directly impacts the total cubic feet of air that must be cooled.
If airflow is insufficient, the AC won't dehumidify properly, leading to mold growth and discomfort. If airflow is too strong, it short cycles and wastes energy.
HVAC professionals use Manual J Load Calculations, factoring in:
An AC system should be sized just right—not too big and not too small—to maximize efficiency and comfort.
At FL HVAC Services, we use precise calculations (Manual J)—not guesswork—to ensure your AC unit is properly sized for maximum comfort, efficiency, and longevity.
📞 Call us today 352-358-5537 to schedule a professional AC assessment!
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