Gas Furnaces (80% & 96%+)

(80% – 96% AFUE) Gas Furnaces

The Gas Furnaces (80% – 96% AFUE) category covers the core gas-fired heating options used alongside central air conditioning and heat pump systems in residential and light-commercial jobs. Here you can compare standard-efficiency 80% furnaces and high-efficiency 90–96% condensing furnaces to match real-world projects: from budget-conscious replacements to premium comfort upgrades with variable-speed blowers and multi-stage burners.

An 80% furnace typically uses atmospheric or induced-draft combustion with metal venting, while 90%+ models are condensing units that extract more heat from the flue gases and vent through PVC or similar materials. Within the 80–96% AFUE range, you’ll find single-stage, two-stage, and modulating gas valves, paired with PSC, multi-speed ECM, or variable-speed blower motors. The right combination can dramatically improve comfort, noise, and operating cost versus older equipment.

• 80% AFUE gas furnaces for applications where metal flue systems already exist or high-efficiency venting is not practical.
• 90–96% AFUE condensing furnaces with PVC venting and condensate drainage for higher fuel savings and modern code requirements.
• Single-stage, two-stage, and modulating models to match budget, comfort expectations, and zoning complexity.
• Upflow, downflow, horizontal, and multi-positional cabinets designed to fit basements, closets, attics, and crawlspaces.
• OEM matching coils and accessories for proper A/C and heat pump integration, filtration, and condensate management.

When selecting a gas furnace in the 80–96% AFUE range, it’s not enough to match BTUs and fuel type. You must confirm venting route, gas line capacity, static pressure, cabinet size, return/supply connection, and compatible evaporator coil with the existing or planned outdoor unit. Use the Compare tools on this page to review AFUE, input/output BTUs, blower type, venting category, and orientation so you can specify a furnace that fits the space and delivers its rated performance.

Pro tip: Before proposing an upgrade from 80% to 90%+ AFUE, walk the venting path and mechanical room. Verify termination locations, condensate drainage, combustion air, and available clearance for new PVC or polypropylene venting. Capture the existing furnace model, duct sizes, gas meter / regulator data, and breaker panel layout, then use that information to select the right gas furnace model, coil match, and install kit that keeps the job on schedule and inspector-ready.