Fan Efficacy & Watt Draw Testing

Fan efficacy measures how much electricity your HVAC blower consumes for the air it delivers — expressed in watts per CFM. Title 24 caps it (typically 0.45 W/CFM for gas furnaces and 0.58 W/CFM for air handlers) because a power-hungry blower wastes energy every hour the system runs, summer and winter alike.

A high watt draw is rarely just an electrical issue — it's usually a symptom of restrictive ductwork, an undersized return, or a high-resistance filter rack forcing the blower to work harder than designed. Catching it at installation prevents a problem that would otherwise plague the system for its entire life.

Fan efficacy verification must be performed by an independent, certified ECC rater. T3 Energy Inc. measures true fan watt draw with a calibrated power meter while simultaneously measuring system airflow, then calculates efficacy against the Title 24 limit for your equipment type. Passing systems get registered CF3R documentation the same day.

Because we measure airflow at the same time, a failing result comes with real diagnostic value: the airflow and static pressure data usually point straight at the restriction, making the fix targeted instead of trial-and-error.

Fan watt draw verification is required alongside airflow verification on most new ducted heating and cooling installations and replacements when listed on your CF1R energy report — which covers the large majority of California system change-outs. We routinely combine it with duct leakage and refrigerant charge testing in a single visit at bundled pricing.

With a clean filter in place, the blower runs at design cooling airflow while a calibrated power meter records the true electrical power the motor consumes and airflow is measured simultaneously. Watts divided by CFM gives fan efficacy, compared against the Title 24 limit. Results are immediate and documentation is registered for permit sign-off.