Air Handler vs. Furnace: What's the Difference and Which Do You Need?

When shopping for HVAC equipment, "air handler" and "furnace" often cause confusion. Both move air through your home, but they serve different purposes and are used in different system configurations. Here's the clear explanation every Minnesota homeowner needs.

What Is a Furnace?

A furnace is a heating appliance. It burns fuel (natural gas, propane, or oil) or uses electric resistance elements to generate heat, then uses a blower motor to push that heated air through your ductwork. In Minnesota's climate, a gas furnace is the primary heating system for the vast majority of homes.

Most furnaces also contain a blower motor that runs during cooling mode — when the furnace isn't generating heat, the blower simply circulates air across the indoor coil (evaporator coil) of your central AC system, which sits above or beside the furnace in the air stream.

What Is an Air Handler?

An air handler is a distribution unit. It contains a blower motor, filtration, and an indoor coil (evaporator or heat coil), but it does not generate heat through combustion. Instead, it works as part of an all-electric system — either with a heat pump (for heating and cooling) or with electric resistance heating strips inside the unit.

Air handlers are the indoor component in a split heat pump system: the heat pump handles the refrigerant-based heating and cooling, and the air handler distributes conditioned air throughout the home.

Side-by-Side Comparison

When Would You Use an Air Handler in Minnesota?

Air handlers make sense in specific situations even in cold-climate Minnesota:

• Dual-fuel hybrid system: A cold-climate heat pump paired with an air handler handles the heat pump's air distribution. For homes without existing gas service, this avoids running a new gas line.
• All-electric new construction: Homes built in all-electric developments or areas without gas access.
• Supplement to radiant heat: Some Minnesota homes use radiant floor heating as the primary heat source and an air handler just for central AC distribution in summer.
• Multi-family buildings: Condos and apartments with electric-only utilities.

What Most Minnesota Homeowners Have (and Need)

The standard configuration for a Minnesota single-family home is:

• Gas furnace (heating + air distribution in all seasons) + central AC condenser (outdoor unit, cooling only) + evaporator coil (installed above the furnace, cooling heat transfer)

This is the system the vast majority of Minnesota homes run, and for good reason: natural gas is abundant, the fuel cost economics favor gas heating in Minnesota, and the furnace/AC split system is a proven, maintainable configuration.

An air handler is only needed if you're going all-electric — which involves a separate cost-benefit analysis given Minnesota's electricity vs. gas rates (see our heat pump vs. gas furnace guide).

Evaporator Coil: The Third Component

One thing that causes additional confusion: the evaporator coil (also called an A-coil or indoor coil) is a separate component that sits above your furnace in the supply plenum. It's part of the AC system, not the furnace. When the AC is running, refrigerant flows through the coil, which absorbs heat from the air passing over it. The furnace blower pushes that cooled air through your ducts.

When replacing a furnace, you should evaluate whether the existing evaporator coil is compatible with the new furnace's airflow specifications. Mismatched coils can reduce efficiency and cooling capacity.

Furnace Direct's Product Line

We carry Goodman gas furnaces for the standard Minnesota home setup, as well as AC condensers, evaporator coils, and package units. All ship factory-direct at wholesale pricing.

Shop Goodman Furnaces + AC Systems →