Finding and replacing the air filter in a Goodman furnace is a simple maintenance task that improves indoor air quality and system efficiency. This guide explains common filter locations, how to access them on different Goodman models, filter sizes and types, step-by-step replacement instructions, troubleshooting tips, and recommended maintenance intervals.
| Topic | Key Points |
|---|---|
| Common Filter Locations | Return air grille, furnace cabinet door, blower compartment |
| Typical Filter Sizes | 16x20x1, 20x25x1, 14x20x1 (verify model) |
| Filter Types | Fiberglass, pleated MERV-rated, washable (limited use) |
| Replacement Frequency | 1–3 months typical; more often for pets/allergies |
How Goodman Furnace Filters Are Designed
Goodman furnaces use air filters to capture dust, pollen, pet dander, and debris before air circulates through the heat exchanger and ductwork. The filter design varies by model and installation: some systems have a filter at the return air grille, while others place it inside the furnace cabinet ahead of the blower. Understanding where the filter sits helps ensure correct airflow direction and proper filtration performance.
Common Filter Locations On Goodman Furnaces
Goodman furnaces typically have one of the following filter placements depending on the model and installation layout.
Return Air Grille
In many homes the filter is located in a wall or ceiling return air grille. This setup places the filter at the point where household air first enters the HVAC system, making it easy to access and replace without opening the furnace cabinet.
Furnace Cabinet Door (Filter Slot)
Some Goodman models house a filter in a dedicated slot behind the furnace’s access panel or cabinet door. The slot may be horizontal or vertical and is often labeled with the filter size. This arrangement keeps the filter closer to the furnace components to protect the blower and heat exchanger.
Blower Compartment or Plenum
On certain installations the filter sits in the blower compartment or return plenum adjacent to the blower assembly. Access usually requires removing a small panel or sliding out the filter media from an interior slot.
How To Identify The Filter Location For A Specific Goodman Model
Locating the filter for a particular Goodman model involves visually inspecting the return pathway and consulting model documentation. The following steps help identify the filter quickly.
- Check The Return Grilles: Look for a removable grill cover in walls, ceilings, or floors near the furnace.
- Inspect The Furnace Cabinet: Open the front access panel (power off first) and look for a filter slot near the blower or return inlet.
- Look For Labels: Goodman often places a sticker or tag on the cabinet indicating filter size and direction of airflow.
- Consult The Manual: Model-specific installation and maintenance manuals provide filter location and replacement instructions.
Step-By-Step Filter Replacement For Goodman Furnaces
These general steps apply to most Goodman furnace setups. Always follow any model-specific instructions found in the furnace manual or on the cabinet label.
- Turn Off Power: Switch off the furnace at the thermostat and the breaker or service switch near the unit to prevent blower startup.
- Locate The Filter: Identify whether the filter is at the return grille, in the cabinet slot, or the blower compartment.
- Remove The Old Filter: Slide out the filter carefully to avoid spilling trapped dust; note the airflow arrow printed on the filter frame.
- Verify Filter Size: Check the dimensions printed on the filter or cabinet label. If replacing from a return grille, measure the filter frame if no label exists.
- Install The New Filter: Insert the new filter with the airflow arrow pointing toward the furnace or blower (away from the return side).
- Restore Power: Replace any access panels, turn the service switch and breaker back on, and set the thermostat to the desired temperature.
Choosing The Right Filter Size And Type
Using the correct filter size and type maintains airflow and avoids damage to the furnace. Common sizes used in Goodman systems include 16x20x1, 20x25x1, and 14x20x1, but actual size varies by installation. Measure frame width, height, and depth if necessary.
Filter Type Considerations
- Disposable Fiberglass Filters: Low cost, low MERV rating, minimal filtration for large particles.
- Pleated MERV-Rated Filters: Better filtration for fine particles; choose an appropriate MERV (8–13 recommended for most residential furnaces) to balance filtration and airflow.
- High-MERV Filters: Provide superior particle capture but can restrict airflow if the furnace blower is not designed for higher static pressure; consult HVAC professional before upgrading above MERV 13.
- Washable/Reusable Filters: Reusable options exist but often provide lower filtration efficiency and require regular cleaning; not recommended for most homes where air quality matters.
Airflow Direction And Filter Orientation
Correct filter orientation is essential. Filters have an arrow indicating airflow direction; this arrow must point toward the furnace or blower and away from the return air opening. Installing a filter backward reduces filter effectiveness and may increase strain on the blower.
Recommended Replacement Frequency For Goodman Filters
Replace filters regularly to protect the furnace and maintain air quality. Typical guidance is to change 1-inch disposable filters every 1–3 months. Pleated filters may last up to 3 months under normal conditions.
- Every 30 Days: Homes with pets, smokers, or occupants with allergies may require monthly changes.
- Every 60–90 Days: Normal occupancy with good indoor air habits.
- Seasonal Check: Inspect the filter at the start of heating and cooling seasons and replace if dirty.
Signs The Goodman Furnace Filter Needs Replacement
Awareness of symptoms helps prevent system issues. Replace the filter if any of the following occur.
- Visible Dirt: Filter surface appears gray or clogged with debris.
- Reduced Airflow: Weaker airflow from vents suggests a restricted filter.
- Increased Energy Use: Higher utility bills without other changes can indicate reduced efficiency.
- Frequent Cycling Or Overheating: A clogged filter can cause the furnace to cycle more or overheat and shut down.
- Dusty Rooms Or Odors: More dust accumulation or stale smells could point to a failing filter.
Troubleshooting Filter-Related Issues
If replacing the filter does not resolve performance problems, further inspection is recommended. Common troubleshooting steps include checking the blower motor, verifying proper filter size, and confirming cabinet seals are intact.
- Verify Filter Fit: A filter that is too small or incorrectly seated can allow unfiltered air past the filter frame.
- Inspect For Air Leaks: Gaps in cabinet doors or duct seams reduce system efficiency and allow dust bypass.
- Check Blower Operation: Unusual noises or failure to run may point to blower motor issues not solved by a filter change.
- Schedule Professional Service: If problems persist after filter replacement, seek an HVAC technician for diagnosis and repair.
Safety And Best Practices When Replacing Filters
Safety precautions protect both the homeowner and the furnace. The following best practices are recommended for changing filters in a Goodman furnace.
- Power Off The Furnace: Always turn off power at the breaker and service switch before accessing internal areas.
- Wear Gloves And A Mask: Use protective gloves and a dust mask if filters are heavily soiled.
- Dispose Properly: Place used filters in a sealed bag to contain dust before discarding.
- Keep Replacement Filters On Hand: Storing filters at home ensures quick replacement when needed.
When To Call An HVAC Professional
Routine filter replacement is user-serviceable, but some conditions require professional attention. Contact an HVAC technician if the furnace shows persistent airflow problems, unusual noises, frequent cycling, error codes on the unit, or if a filter upgrade may impact blower performance.
Tips To Improve Filter Lifespan And Home Air Quality
Several simple steps extend filter life while improving indoor air quality.
- Use A Return Air Pre-Filter: A lower-cost pre-filter at the return grille can catch large debris and prolong pleated filter life.
- Regular Vacuuming And Dusting: Reducing household dust reduces filter loading.
- Control Humidity: High humidity can reduce filter effectiveness and promote mold; use dehumidifiers if needed.
- Seal Ducts And Replace Weatherstripping: Properly sealed ducts reduce dust entry into the system.
Resources And Model-Specific Information
Goodman publishes product manuals and installation guides that include filter location and size information. Model and serial numbers are typically on a label inside the furnace access panel. For accurate details, reference the Goodman product manual or the manufacturer’s website.
| Resource | Use |
|---|---|
| Goodman Official Website | Manuals, parts, and model lookup |
| Unit Data Plate | Model and serial for exact filter specs |
| Local HVAC Dealer | On-site inspection and filter recommendations |
Quick Checklist For Replacing A Goodman Furnace Filter
- Turn off power at thermostat and breaker.
- Locate filter at return grille, cabinet slot, or blower compartment.
- Remove old filter and note airflow arrow and size.
- Install correctly oriented new filter of the right size and MERV rating.
- Restore power and run the furnace to verify airflow.
- Record replacement date and set reminder for next change.