Downflow Furnaces

Airflow direction is the one furnace spec your house decides for you. A downflow furnace pulls in return air at the top and sends heated air out the bottom, which is exactly what a home on a slab foundation or with under-floor ductwork needs. If your last furnace sat in a main-floor closet, an attic, or a garage with ducts running below, a downflow gas furnace is almost certainly what you are replacing it with.

Chances are you already know your configuration and are comparing efficiency tiers and staging from there. If you are not yet sure which orientation your home takes, our upflow vs downflow furnace guide settles it quickly, and larger homes running high heating loads can step directly into our 100,000 BTU Downflow Furnaces range. Our team will confirm fit and capacity before your order ships.

Why Choose Downflow Furnaces from HVAC Store?

•  Every downflow model we carry is built to the highest standards of quality and performance.

•  Comprehensive warranty coverage protects your heating system for genuine peace of mind.

•  Efficiency choices from 80% to 96% AFUE suit every climate and budget.

•  Our dedicated team confirms airflow orientation and capacity before you commit.

You Might Also Like

•  Upflow Furnaces - Switch to upflow models if your furnace lives in a basement with ductwork running overhead.

•  Goodman Downflow Furnaces - Narrow the field to Goodman's downflow lineup when you already know and trust the brand's equipment.

•  Furnaces - Compare the full furnace catalog across every airflow orientation, efficiency tier, and brand that we currently stock.

Best Downflow Furnaces for...

Slab Homes and Main-Floor Closets

The best downflow furnace for slab homes is a compact-width model that fits tight closets. The Goodman 80% AFUE 60K BTU Two-Stage Low NOx Furnace squeezes into 14-inch spaces.

Fuel-Efficiency Upgrades

The best downflow gas furnace for lowering fuel bills is a condensing 96% AFUE model. The Goodman 96% 80,000 BTU Two-Stage Furnace pays back its premium every heating season.

Larger Homes and Cold Winters

The best counterflow furnace for big homes in cold climates is high output with variable-speed airflow. The Goodman 96% 120K BTU Variable Speed Furnace heats large layouts evenly.

Attic Installs and Flexible Orientation

The best pick for attics is a convertible downflow and horizontal model. The ACiQ 40K BTU 96% AFUE 9-Speed Two-Stage Furnace adapts to whichever way your attic ducts run.

Quick Spec Comparison

Here is how the right downflow furnace lines up by application, so you can match output and efficiency to your home before you shortlist a model.