How HVAC Works
What Is a Load Calculation (Manual J)?
The industry-standard method (ACCA Manual J) for calculating a home's actual heating/cooling demand from square footage, insulation, windows, and orientation — the basis for correct equipment sizing.
This definition is pending sign-off from a licensed HVAC reviewer.
Why It Matters to You
A system sized without a real load calculation is a guess — too big and it short-cycles without removing humidity, too small and it runs constantly without keeping up.
Practical Guidance
Ask whether your installation quote includes a Manual J load calculation, not just a match to your existing unit's size.
See it in context
→ Right-Sizing an AC for Humid Alabama Summers
Related Terms
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