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AUDC Mid-Efficiency, Single-Stage
1. Induced draft venting quietly draws hot gases through the heat exchanger, maximizing the heat transfer efficiencies of the exchanger design.
2. Multi-port in-shot burners perfectly shape the flame cone for the maximum heat possible, while using less fuel.
3. Adaptive silicon nitride hot surface igniter starts burners electrically for safe, efficient operation. There's no pilot light constantly burning fuel.
4. Aluminized steel heat exchanger is crimped, not welded, to prevent cracks from heat stress. Stamped serpentine channel offers greatest efficiency in less space. Backed by our 20-year, non-prorated, limited warranty.
5. Heavy steel insulated cabinet holds more heat in the furnace to better warm your home. Also assures greater durability and quieter operation.
6. Self-diagnostic controls are the solid-state brain of the Freedom® 80 and manage every function with digital accuracy. Includes safety features and a built-in troubleshooting system.
7. Dual door latches allow easy access to the filter for cleaning or changing (on upflow models only).
8. Sound insulated blower compartment assures the quietest possible operation.
9. Cleanable filter
10. Spring-loaded filter rack automatically adjusts for standard off-the-shelf filters (on upflow models only).
11. Automotive grade gaskets and insulated blower door reduce operating sound and air infiltration.

Upflow/Horizontal & Downflow/Horizontal: Heavy-duty steel insulated cabinet; Self-diagnostic control system; Washable filter; Multi-port in-shot burners; Hot surface igniter; Aluminized steel heat exchanger up to 80 AFUE; 20-year non-prorated limited warranty on heat exchanger; 5-year limited warranty on all other parts.
Model Number Tonnage Capacity AFUE Dimensions (inches) Shipping
Weight (lb)
H W D
AUD040C924K 2 32,000 80.00 40.0 14.5 28.0 119
AUD040C930K 2.5 32,000 80.00 40.0 14.5 28.0 122
AUD060C924K 2 47,000 80.00 40.0 14.5 28.0 124
AUD060C936K 3 47,000 80.00 40.0 14.5 28.0 127
AUD080C924K 2 64,000 80.00 40.0 17.5 28.0 139
AUD080C936K 3 63,000 80.00 40.0 17.5 28.0 142
AUD080C948K 4 64,000 80.00 40.0 17.5 28.0 142
AUD080C960K 5 64,000 80.00 40.0 21.0 28.0 156
AUD100C936K 3 79,000 80.00 40.0 17.5 28.0 151
AUD100C945K 4 80,000 80.00 40.0 17.5 28.0 153
AUD100C948K 4 79,000 80.00 40.0 21.0 28.0 162
AUD100C960K 5 79,000 80.00 40.0 21.0 28.0 162
AUD100C972K 6 80,000 80.00 40.0 24.5 28.0 175
AUD120C954K 5 96,000 80.00 40.0 21.0 28.0 176
AUD120C960K 5 96,000 80.00 40.0 24.5 28.0 186
AUD140C960K 5 111,000 80.00 40.0 24.5 28.0 193


Publications and Manuals

(PDF files)
AUD Users Manual  610 KB
Service Facts  717 KB