Furnaces & Air Handlers for HVAC Systems

We help contractors and facility managers source gas furnaces, air handlers, and related components. Availability may vary by supplier, stock status, manufacturer policy, and product type.

What This Category Includes

ⓘ We do not claim authorized dealer or factory-direct status. For equipment sizing, refrigerant compatibility, or OEM part lookup, submit your model number and serial number.

Gas Furnaces

Natural gas and propane furnaces in 80% AFUE (non-condensing) and 90%+ AFUE (condensing) configurations. Single-stage, two-stage, and variable-speed blower options.

Air Handlers

Indoor units for heat pump and split system applications. Variable-speed ECM blower motors for improved efficiency and comfort.

Furnace Components

Heat exchangers, ignitors, flame sensors, draft inducers, blower motors, and control boards for furnace service and repair.

Coil Cabinets

Evaporator coil cabinets for installation above or below furnaces in split system applications.

Dual-Fuel Systems

Heat pump + gas furnace combinations for cold-climate applications. Provides heat pump efficiency with gas backup reliability.

Oil Furnaces

Oil-fired furnaces for applications without natural gas service. Less common in new installations.

Furnace Efficiency Comparison

Type	AFUE Range	Venting	Best For
Standard Efficiency	80% AFUE	B-vent or direct vent	Retrofit where high-efficiency venting is impractical
High Efficiency (Condensing)	90–98% AFUE	PVC direct vent + condensate drain	New construction, energy code compliance, fuel cost reduction
Variable-Speed	90–98% AFUE	PVC direct vent	Best comfort, humidity control, and efficiency
Two-Stage	90–96% AFUE	PVC direct vent	Improved comfort over single-stage at lower cost than variable-speed

Frequently Asked Questions

Q: What is the difference between a furnace and an air handler?

A furnace generates heat by burning fuel (natural gas, propane, or oil) and distributes it through ductwork. An air handler does not generate heat; it circulates air over a heating or cooling coil connected to a heat pump or chiller. Air handlers are used with heat pumps; furnaces are used in gas heating systems.

Q: What AFUE rating should I look for in a furnace?

AFUE (Annual Fuel Utilization Efficiency) measures furnace heating efficiency. Current DOE minimums are 80% AFUE (non-condensing) and 90%+ AFUE (condensing). High-efficiency condensing furnaces (95–98% AFUE) reduce fuel costs but require PVC flue venting and condensate drainage.

Q: What is a dual-fuel system?

A dual-fuel system pairs a heat pump with a gas furnace. The heat pump handles heating in mild weather; the furnace takes over when outdoor temperatures drop below the heat pump's efficient operating range (typically 35–40°F). Dual-fuel systems offer the efficiency of a heat pump with the reliability of gas backup.

Q: What size furnace do I need?

Furnace sizing is based on the building's heating load, calculated using Manual J methodology. Oversized furnaces short-cycle, reducing efficiency and comfort. Undersized furnaces cannot maintain setpoint on design heating days. Contact us with your load calculation for sourcing guidance.