Furnaces AUH2 Freedom 95 Comfort R-2 Stage DC 96% High-Efficiency 95% 2-Stage Variable Speed AUH3 Freedom 95 Communicating 3-Stage DC 95% High-Efficiency 95% 2-Stage Multi-Speed AUC Single-Stage 92% High-Efficiency 92.1% Multi-Speed AUD R9V Freedom 80 2-Stage DC 80% Mid-Efficiency 80% 2-Stage Multi-Speed AUD Single-Stage 80% Mid-Efficiency 80% Single-Stage Multi-Speed