Arcoaire Furnace Filter Location and How to Replace It

The article explains where to find the Arcoaire furnace filter, how to remove and replace it, common filter sizes, and maintenance tips to keep the heating system efficient and safe. This guide focuses on typical Arcoaire residential furnaces and covers variations across models for U.S. homeowners and service technicians.

Arcoaire Model Type	Typical Filter Location	Common Filter Size(s)
Upflow Furnace	Return air grille or left/right side access panel	16x20x1, 20x25x1, 14x20x1
Downflow Furnace	Return duct or furnace upper compartment	16x25x1, 20x20x1, 14x25x1
Horizontal Furnace	Return duct near blower or side access	20x16x1, 20x25x1, custom sizes

Why Knowing The Arcoaire Furnace Filter Location Matters

Locating the Arcoaire furnace filter is the first step in routine HVAC maintenance. A clogged or incorrectly installed filter reduces airflow, increases energy use, and may damage the blower motor or heat exchanger.

Regular filter checks extend equipment life, improve indoor air quality, and prevent system failures during peak heating seasons.

Common Arcoaire Furnace Configurations And Filter Positions

Arcoaire furnaces come in several cabinet orientations: upflow, downflow, and horizontal. Each orientation affects filter placement and access method.

Upflow Furnaces

In upflow Arcoaire furnaces, air is drawn from the bottom and moves upward through the heat exchanger. Filters are often located at the return air grille, inside the furnace cabinet on the side, or at the top where the return duct connects.

Downflow Furnaces

Downflow units draw air from the top and push it downward. Filters typically sit in the upper compartment of the furnace or the return duct above the furnace. Some installations use a filter grille in a closet or ceiling return.

Horizontal Furnaces

Horizontal Arcoaire furnaces, commonly installed in attics or crawlspaces, have filters in the side of the cabinet or in the return air duct immediately adjacent to the unit. The access panel may be horizontal and secured with screws.

How To Locate The Filter On Your Specific Arcoaire Furnace

Begin by identifying the furnace orientation and following these steps for safe inspection and removal.

1. Turn Off Power: Switch off the furnace at the thermostat and the service switch on the furnace or at the breaker panel.
2. Inspect Return Grilles: Check main return grilles in hallways or near the furnace. Many homes house the filter behind a return grille with a slide-in slot.
3. Check Furnace Panels: Examine the furnace cabinet for a removable access panel. Filters often slide into rails behind the blower compartment or along the cabinet side.
4. Look In The Ductwork: If not in the furnace, the filter may be in the return duct upstream from the unit—look for a filter rack or metal box with a slot.
5. Review Model Label: The furnace data plate or owner’s manual may indicate filter location and size. Manufacturer model numbers help when searching online for documentation.

Step-By-Step: Removing And Replacing An Arcoaire Furnace Filter

Follow these steps to replace the filter safely and correctly for optimal performance.

1. Power Off: Turn off the furnace at the thermostat and the service switch. This prevents the blower from turning on during service.
2. Access The Filter: Open the return grille, remove the side/top access panel, or slide out the filter from the duct slot. Use a screwdriver if panels are secured with screws.
3. Note Filter Orientation: Observe the airflow arrow stamped on the filter frame. The arrow must point toward the furnace/blower (in the direction of airflow).
4. Remove The Old Filter: Slide out the filter carefully to avoid releasing dust into the air. If very dirty, seal it in a plastic bag for disposal.
5. Measure Or Confirm Size: Read the printed size on the filter frame. If unreadable, measure length x width x thickness. Filters typically list nominal size (e.g., 16x20x1).
6. Install The New Filter: Insert the new filter with the airflow arrow pointing toward the furnace. Ensure a snug fit with no large gaps around the edges.
7. Secure Panels: Replace any access panels or grille covers and restore power to the furnace.
8. Record The Date: Mark the replacement date for future maintenance scheduling.

Choosing The Right Filter For An Arcoaire Furnace

Selecting the correct filter balances airflow, filtration efficiency, and furnace compatibility.

• MERV Rating: Most residential systems perform well with filters rated MERV 6–11. Higher MERV values capture smaller particles but may restrict airflow if the furnace blower isn’t sized for denser media.
• Thickness: Standard furnaces use 1-inch filters, while some setups accept 4- or 5-inch media for extended life. Verify the filter slot depth before upgrading thickness.
• Size Accuracy: Use the exact filter dimensions or the nearest fit. Avoid forcing an oversized filter into a smaller slot.
• Electrostatic/HEPA Options: True HEPA is not used directly in most furnaces; using high-MERV or electrostatic filters can improve air quality but consult a technician if moving above MERV 11.

Recommended Replacement Intervals And Maintenance Tips

Proper maintenance prevents performance issues and costly repairs.

• Replacement Frequency: Replace 1-inch filters every 1–3 months; replace thicker media filters every 6–12 months depending on household conditions.
• High-Use Or Sensitive Households: Homes with pets, smokers, or allergy sufferers may need monthly changes to maintain air quality.
• Seasonal Checks: Inspect filters during fall and spring system changes to ensure cleanliness before heavy heating or cooling seasons.
• Keep Return Vents Clear: Avoid blocking return grills with furniture, as restricted intake increases strain on the system.

Troubleshooting Common Filter-Related Issues

Recognizing filter-related symptoms helps diagnose problems fast.

• Weak Airflow: A clogged filter can cause reduced airflow. Replace the filter and recheck system airflow.
• Excessive Cycling Or Overheating: Restricted airflow forces the furnace to work harder, possibly triggering limit switches or short cycling.
• Higher Energy Bills: Dirty filters reduce efficiency, increasing runtime and energy consumption.
• Unusual Noises: A dirty filter can cause the blower to work louder. Check the filter as part of any noise diagnosis.

Where To Buy Replacement Filters For Arcoaire Furnaces

Filters are widely available; selecting quality and correct size matters more than brand name.

• Home Improvement Stores: Large retailers offer a wide range of sizes and MERV ratings for quick replacement options.
• HVAC Suppliers: Local HVAC shops and online HVAC supply houses can provide OEM or exact-fit filters, including thicker media and higher-MERV options.
• Online Marketplaces: Search by measured dimensions or furnace model for convenience and multi-pack cost savings.
• Subscription Services: Consider filter delivery subscriptions to ensure timely replacements and avoid delays during peak seasons.

When To Call An HVAC Professional

Some situations require professional diagnosis and service rather than DIY filter changes.

• Incorrect Fit Or No Filter Slot: If the furnace lacks a readily accessible filter slot, a technician can install a proper filter rack or retrofit a cabinet for filtration.
• Persistent Airflow Problems: After replacing the filter, if airflow remains weak or the system cycles abnormally, call a licensed HVAC technician.
• Safety Concerns: If the furnace smells of gas, trips breakers, or shows signs of overheating, discontinue use and get professional help.

Documenting Filter Location And Maintenance

Maintaining records simplifies future service and improves system reliability.

• Label The Filter Slot: Add a durable label near the filter access noting the correct filter size and orientation.
• Maintenance Log: Keep a simple log with replacement dates and filter type to track intervals and predict part purchases.
• Store Spare Filters: Keep one or two spare filters on hand in the correct size to avoid delays during busy seasons.

Safety And Best Practices When Servicing An Arcoaire Furnace

Safety precautions reduce risk and protect equipment during filter service.

• Power Off: Always switch off power at the service switch or breaker before opening the furnace.
• Wear Protection: Use gloves and a dust mask when removing heavily soiled filters to limit exposure to dust and allergens.
• Avoid Forced Fits: Never force a filter into a slot that is too small; improper fits can bypass filtration or damage the blower.
• Follow Manufacturer Guidance: Consult the Arcoaire owner’s manual or model data plate for specific recommendations on filter sizes and types.

Key Takeaways For Finding And Replacing An Arcoaire Furnace Filter

Locate the filter by checking return grilles, furnace panels, and ductwork. Match the exact filter size and ensure the airflow arrow points toward the furnace. Replace 1-inch filters every 1–3 months and thicker media as recommended. Keep spares on hand and contact a professional for persistent airflow issues or complex installations.

Following these practices preserves Arcoaire furnace performance, reduces operating costs, and improves indoor air quality.