90+ GAS FURNACE COMPARISON
with image, control usage, heat exchanger materials, warranty, special features

	AMAMA: AMV9/ACV9 2 stage heat, variable speed blower;  AMH95 2 stage; AMS95/ACS9 single stage; GMS9/GCS9 builder 90; White-Rodgers Intell-ignition; stainless steel heat exchangers, aluminized primary on GMS9/GCS9; warranty lifetime heat exchanger, 5 year parts; AMV9/ACV9 free furnace if heat exch fails on original owner, AMS9/ACS9 10 year free furnace if heat exch fails on original owner
	ARMSTRONG/AIR-EASE: Enhanced 95V 2 stage heat, variable speed blower; Enhanced 93 2 stage upflow only; Advantage 93; Tech 91 upflow only; 2 stage uses proprietary UTEC board; single stage use Honeywell controls; both use Norton shielded mini-ignitor; stainless steel heat exchangers; warranty lifetime/5 year parts
	BRYANT: 355 2 stage heat, variable speed blower; 352 2 stage; 350 single stage;  340 builder models;  proprietary controls, silicon nitride ignitor; aluminized steel primary heat exchanger; warranty lifetime heat exchanger except 340 which is 20 years; 5 year parts;
	CARRIER: Infinity MVB 2 stage heat, variable speed blower; MTB 2 stage heat;  MXB single stage ;  MCB  builder model;  proprietary controls, silicon nitride ignitors; aluminized steel primary heat exchanger; warranty lifetime heat exchanger except MCB which is 20 years; 5 year parts;
	COLEMAN, FRASER-JOHNSTON, LUXAIRE: GM9S single stage;  White-Rodgers controls with unknown ignitor; aluminized steel primary heat exchanger; warranty lifetime heat exchanger/5 year parts
	COLEMAN ECHLON, LUXAIRE ACCLIMATE: FC9V 2 stage heat, variable speed blower; FC9C modulating input with single stage stat, variable speed blower; FC9M modulating input with single stage stat, standard blower; FC9T 2 stage heat; FC9S single stage heat; unknown controls with hot surface ignition; tubular aluminized steel primary; warranty lifetime heat exchanger/5 year parts
	DUCANE: single stage; uses Honeywell controls; aluminized steel heat exchanger; warranty 20 year heat exchanger/5 year parts; also sold as Aire-Flo & Pro Series
	GOODMAN/JANITROL:  GMV95/GCV93 2 stage heat, variable speed blower; GMH95/GCH93 2 stage heat; GMS95 upflow single stage; GMS93/GCS93 single stage; GKS92 single stage; White-Rodgers board with Norton mini ignitor; tubular aluminized steel primary; lifetime heat exchanger warranty, 10 year free furnace if heat exchanger fails (except GKS), 5 year parts
	HEAT CONTROLLER (Century & Comfortaire): Conquest 90 2 stage heat; also single stage model; proprietary controls with standard silicon carbide ignitor (1 stage) or spark (2 stage); stainless steel primary; warranty lifetime heat exchanger/5 year parts
	ICP (Heil, Arcoaire, Comfortmaker, Tempstar): *9PMV 2 stage heat, variable speed blower, *9MPT 2 stage heat, *9MPC single stage, *9UHX single stage, N9MP2 2 stage heat, N9MP1 single stage; proprietary board with silicon nitride ignitors; stainless steel primary; branded models have lifetime heat exchanger warranty with 5 year furnace replacement; N models have 20 year, 5 year parts; * indicates first letter of brand, N models are the builder units
	LENNOX: G61V 2 stage heat variable speed blower, G61 2 stage heat, G51  single stage; builder model G43 single stage; W-R Intell-ignition; aluminized steel primary heat exchanger; warranty lifetime heat exchanger on new multiposition G61/51,  5 year parts;  Merit G43 20 year heat exchanger, 5 year parts
	MAYTAG: 1010 2 stage variable speed or single stage; 1000 single stage; silicon nitride ignitor; aluminized steel heat exchanger; stainless steel front on 1010; variable speed kit can be added to PSC furnaces; lifetime heat exchanger warranty replaces furnace on 1010; 10 year parts & labor warranty, 1000 has 10 year parts
	NORDYNE (Frigidaire/Tappan/Westinghouse) FG6TC/L 2 stage heat variable speed blower, FG6RC/L single stage; L1RC 34" single stage upflow; properietary controls, silicon nitride ignitor; aluminized steel primary heat exchanger; warranty lifetime heat exchanger/8 year parts - replacement furnace if heat exchanger fails in 5 years. (Philco/Kelvinator) G6TC/L 2 stage heat variable speed blower, G6RC/L single stage; proprietary controls, silicon nitride ignitor; aluminized steel heat exchanger; warranty lifetime heat exchanger/6 year parts. (Gibson) KG6RC/L single stage; proprietary controls, unknown ignitor; aluminized steel heat exchanger; warranty heat exchanger unknown/5 year parts
	PAYNE: P9GM single stage multiposition; proprietary controls with standard silicon carbide ignitor; aluminized steel heat exchanger; warranty heat exchanger 20 years/5 year parts
	RHEEM/RUUD: *GFD/*GGD/RGJD modulating input variable speed blower; *GRK/*GRL/*GGK 2 stage; *GRA/*GTA single stage; *GRJ/*GTJ economy single stage; proprietary controls with spark ignition (economy models use  silicon carbide ignitors); stainless steel heat exchangers except economy upflow; warranty lifetime heat exchanger (new furnace if heat exchanger fails on modulating models, 5 year parts, economy models 20 year heat exchanger [*R=Rheem U=Ruud]
	TRANE/AMERICAN-STANDARD: *UY/*DY 2 stage variable speed, *UX-R/*DX-R 2 stage, *UX/*DX single stage, *UC/*DC economy single stage; White-Rodgers Intell-ignition (White-Rodgers with standard silicon carbide ignitor on economy model); aluminized steel heat exchanger; warranty lifetime heat exchanger, 5 year parts [*=A for American-Standard T=Trane]
	THERMOPRIDE: CHX/CDX 2 stage heat; CHB/CDB single stage; White-Rodgers controls with standard silicon carbide ignitor; 16 gauge stainless steel heat exchanger; warranty lifetime heat exchanger/5 year parts
	WEATHERKING: single stage; proprietary board with silicone carbide ignitor; stainless steel heat exchanger dowflow, aluminized steel upflow; warranty 20 year heat exchanger/5 year parts
	YORK: GY9S single stage, PUR single stage; unknown controls with hot surface ignition; aluminized steel heat exchanger; warranty lifetime heat exchanger/5 year parts
	YORK AFFINITY: PV9 2 stage heat, variable speed blower, PC9 modulating input with single stage stat, variable speed blower, PM9 modulating input with single stage stat, standard blower, PT9 2 stage heat, PS9 single stage; tubular aluminized steel primary; warranty lifetime heat exchanger/5 year parts

This info was gathered from literature and the manufacturers' web sites. Please let me know of any additions or corrections needed. E-mail me!