Skip to main content
Find a Local Expert Get System Recommendation

Understanding Downflow Furnaces: A Comprehensive Guide

By Travis Baugh

A downflow furnace, sometimes known as a downdraft furnace, is a vital heating system that ensures your home remains warm and comfortable. In this detailed guide, we will delve into the workings of downflow furnaces, provide installation and maintenance advice, and highlight the energy efficiency and cost savings these systems offer.

One of the primary benefits of a downflow furnace is its ideal for attic installation or in some cases a closet on the main floor or garage.

How Do Downflow Furnaces Work?

Unlike a horizontal furnace or upflow furnace, downflow furnaces draw in cool air from the top, heat the air and then force it downward, distributing the warm air through a network of ducts. Key components include the burner, heat exchanger, blower, and thermostat.

The burner ignites the fuel—be it natural gas, propane, or oil—while the heat exchanger transfers the generated heat to the passing air. The blower then pushes this warm air into the ductwork for even distribution throughout the house. The thermostat controls the temperature by signaling the furnace to activate or deactivate.

a carrier infinity downflow furnace installed in a basement

Installation and Maintenance Tips for Downflow Furnaces

Downflow Furnace Installation

Proper installation of a downflow furnace is crucial for its efficiency and longevity. Unlike standard furnaces, downflow models push heated air downward, making them ideal for homes with attic installations. Professional furnace installation ensures correct airflow, proper venting, and secure duct connections to prevent heat loss and inefficiencies. The furnace must be placed on a heat-resistant surface, and sufficient clearance should be maintained for safe operation.

Down Flow Furnace Maintenance

Regular professional furnace maintenance help keep your furnace running efficiently. You can replace furnace filters every 1-3 months to maintain airflow and prevent dust buildup. They will clean the blower assembly and inspect the heat exchanger annually to avoid performance issues. Checking the condensate drain regularly is also essential to prevent water buildup and leaks.

Downflow Furnace Troubleshooting

For furnace troubleshooting, common issues include weak airflow, uneven heating, or frequent cycling. Ensure vents are open and unobstructed, and check for thermostat malfunctions. If problems persist, consult an HVAC professional to diagnose and resolve issues before they escalate. Proper gas furnace installation and routine maintenance will keep your downflow furnace performing optimally for years.

Energy Efficiency and Cost Savings For Down Flow Furnaces

Energy efficiency and cost savings are important factors when selecting a heating system for your home. The Annual Fuel Utilization Efficiency (AFUE) rating is a key measure of a furnace's efficiency, indicating the percentage of fuel converted into usable heat. The higher the AFUE rating, the more efficient the furnace. Carrier offers many furnaces with high AFUE ratings for energy-conscious homeowners.

High efficiency can translate into reduced energy consumption, which may lead to lower monthly heating bills. Additionally, the reduced energy usage means a lesser environmental impact, as fewer greenhouse gas emissions are produced. With Carrier's range of multipoise furnaces, you can be confident in investing in a heating system that prioritizes both your comfort and the environment. Contact your local Carrier dealer to learn which system is right for your home.

a carrier dealer stands next to an installed down flow furnace

Frequently Asked Questions About Down Flow Furnaces

The choice between an upflow and downflow furnace depends on your home’s layout and climate. Upflow furnaces, installed in basements or attics, can be more efficient in colder climates and better for multi-story homes. Downflow furnaces, better suited for homes without basements, provide even heating in single-story homes and fit well in closets or utility rooms. Consult your local Carrier dealer to determine the best option based on your specific needs.
It depends. Carrier does sell multipoise furnaces, meaning they are capable of being installed in upflow, downflow or even a horizontal orientation. Check with your local Carrier dealer to see if this is a viable option for your home.
Yes, a downflow furnace can be installed horizontally if the furnace model is designed for horizontal installation. Furnaces are multi-poise, allowing for vertical (upflow or downflow) or horizontal configurations. Check the manufacturer’s specifications to ensure compatibility. Installation from a Carrier professional can ensure proper function and safety.
To tell if a furnace is upflow or downflow, check the direction of airflow. An upflow furnace draws air from the bottom and blows it upward through the ducts, while a downflow furnace pulls air from the top and directs it downward. You can also check the unit's installation manual for confirmation.
A downflow furnace is generally not more expensive than an upflow furnace. Various factors affect furnace installation costs, but direction of airflow is typically not one of the primary drivers of furnace cost.
A downflow furnace is typically located in basements, crawl spaces, or utility rooms, where the unit is positioned to blow air downward into the ductwork.
A downflow furnace is designed to direct heated air downward through ducts. It pulls air from the top, heats it, and then forces it downward into the living space, making it ideal for homes with certain layouts.

Explore Carrier Upflow Furnaces

Choosing a Carrier upflow furnace ensures reliable and efficient heating for your home, with advanced technology that optimizes energy use and enhances comfort. Known for their durability, quiet operation, and competitive AFUE ratings, Carrier upflow furnaces provide consistent warmth throughout the winter while helping to reduce heating costs. When you're buying a new furnace, explore Carrier's line of upflow furnaces. Schedule an appointment with your local Carrier dealer for furnace installation today.

infinity-98-gas-furnace-with-greenspeed-intelligence-59MN7
Infinity® 98 Gas Furnace With Greenspeed® Intelligence
59MN7

ENERGY STAR® certified. Our highest efficiency and most advanced furnace with up to 98.5% AFUE for premium energy savings with excellent humidity control and premium comfort

Initial Cost $$$
performance-96-gas-furnace-59TP7
Performance™ 97 Gas Furnace with InteliSense™ Technology
59TP7

ENERGY STAR® certified. Up to 97.0% AFUE for premium energy savings with enhanced comfort features.

Initial Cost $$
carrier-comfort-96-gas-furnace-59SC6
Comfort™ 96 Gas Furnace
59SC6

All sizes ENERGY STAR® certified. Up to 97% AFUE for premium energy savings with standard comfort features.

Initial Cost $

Learn More About Down Flow Furnaces

 
Chat-icon
Let's chat
- Home-icon
chat-circle-icon