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Does your apartment sometimes feel stale or stuffy? Indoor air can hold 2–5 × more pollutants than outdoor air (1). A 2024 study found that one-third of apartments break World Health Organization PM₂.₅ limits on an average day because shared ductwork moves dust and fumes from one unit to another (2). In other words, neighbors share air as well as hallways.
If you’ve never swapped an apartment air filter before, this guide shows why it matters and how to do it.
Apartment air can be 2–5 times more polluted than outdoor air.
Regular filter changes protect air quality and keep HVAC systems efficient.
Choose the right filter based on allergies, budget, MERV rating, and size.
Avoid mistakes like wrong size filters or neglecting replacement.
Check your lease to see who's responsible for air filter changes.
First, you might ask, “who's responsible for changing an apartment air filter?” Check your lease. Landlords normally install a fresh filter before move-in, but ongoing changes are usually the tenant’s job. Replace it every three months—more often if you have pets or smoke.
Now that you've decided to change your apartment air filters, it's time to get them changed! But wait, where is the air filter in my apartment? You may have access to 2 air filters if there’s a furnace and AC unit in your apartment. Here's how to find both.
The location depends on how your furnace is installed:
Horizontal unit: Look for a slot on the intake side.
Vertical unit (upward airflow): The filter is behind a door at the bottom.
Vertical unit (downward airflow): Check the door at the top.
Can’t access the furnace? Most flats have a secondary filter behind the large return-air register. Remove the grille to reach it.
Central return register (often in a hallway ceiling)
Air-handler box (usually in a cupboard) with a dedicated slot
If you’re unsure, ask building maintenance before forcing a panel.
These can be trickier, so check these spots:
Central air return register: This is usually in a common area like a hallway ceiling. Remove the grill to find the filter.
Multiple return registers: Look for an air handler (often in a closet) with a slot and removable cover where the filter sits.
Remember: If you're unsure or have difficulty accessing anything, consult your landlord.
Changing an air filter is one of the simplest apartment-maintenance chores once you know the filter location and the correct size. Follow these six steps:
Turn off the power. Use the nearby HVAC disconnect switch; if you can’t find it, shut off the breaker for the entire flat—better safe than sorry.
Remove the vent/register cover. A screwdriver may be needed; set the screws somewhere safe.
Check the airflow arrows. Most filters must face a specific direction. Note the arrows on the old filter so the new one goes in the same way.
Pull out the old filter. It may be dusty, so have a bin-liner ready to contain debris.
Insert the new filter. If you bought the right size, it should slide in easily with no gaps around the frame.
Re-attach the cover. Tighten screws or snap the grill back into place—and you’re done.
Even if you’ve never replaced an apartment air filter before, the job takes about five minutes and you’ll breathe cleaner air right away.
See More: Step-by-Step Video How to Change Your Air Filter
Most disposable filters last one to three months. Factors that shorten lifespan include:
High occupancy
Allergies or asthma
Pets that shed
Smoking indoors
Poor outdoor air quality
Check the filter monthly for your first three cycles; you’ll soon learn your ideal schedule. Tip: Set up a subscription so replacements arrive exactly when you need them.
A building HVAC system pulls air through many flats, so your filter traps dust, pollen and pet dander from more than one household. Mid-rise and high-rise buildings move even more fine particles than garden-style blocks. Check the filter once a month at first; when you see how quickly it darkens, set a schedule that suits your building.
Your register accepts only filters up to a certain depth and width, so a precise fit is crucial for efficiency and clean air.
DIY stores stock limited dimensions. If yours is unusual, go online for custom-sized filters rather than “cut-to-fit” sheets, which can sag or leak.
Cut-to-fit: A large filter trimmed down—quick but less rigid.
Custom size: Built exactly to your measurements—best structural integrity and performance.
Read More: How to Measure Your Air Filter
Watch Video: How to Measure Your Air Filter
MERV measures filtration strength. The higher the number, the more dust and allergens the filter removes.
Higher MERV = cleaner air, tougher airflow. A MERV 13 filter stops smoke- and virus-sized particles, but it also makes the fan push harder.
Match the unit’s label. Use only the MERV range printed on the air-handler; going higher can overwork the blower and spike energy bills.
When in doubt, ask building maintenance or the property manager before moving to a higher-MERV filter.
Read More: All About MERV Ratings
Not always. It depends on the lease agreement. Landlords may install a new one initially, but replacements are often tenant responsibility.
There are a few signs that your air filter needs replacing:
Reduced airflow: If you notice a decrease in airflow coming from your vents, it could be a sign that your air filter is clogged and needs to be replaced.
Increased allergies: If you or your family members are experiencing increased allergy symptoms, such as sneezing, coughing, or itchy eyes, it could be due to a dirty air filter allowing allergens to circulate in your home.
Visible dust buildup: If you see dust and debris buildup around your air vents or on surfaces in your home, it could be a sign that your air filter is no longer effectively capturing these particles.
Strange odors: A musty or moldy smell coming from your HVAC system could indicate that your air filter is contaminated with mold or mildew, in which case it should be replaced promptly.
If you're having trouble locating your air filter, don't hesitate to consult your landlord or building maintenance. They should be able to point you in the right direction. Additionally, the owner's manual for your HVAC unit may also have information on where the air filter is located.
There are several steps you can take to improve the air quality in your apartment (3):
Control pollution sources: This includes things like avoiding harsh chemicals, using low-VOC paints and cleaning products, and maintaining good ventilation while cooking or showering.
Increase ventilation: Open windows regularly, especially when cooking, showering, or using cleaning products. You can also consider using exhaust fans in kitchens and bathrooms.
Change air filters regularly: As discussed in this blog, replacing air filters is crucial for capturing dust, allergens, and other pollutants.
Invest in air purifiers: Air purifiers can be a helpful addition to your apartment, especially if you suffer from allergies or asthma. Look for HEPA filters for the most effective air cleaning.
Communicate with your landlord: If you suspect there are issues with the ventilation system, such as mold or improper air intake placement, it's important to bring this to your landlord's attention. They may need to address these concerns to ensure overall building air quality.
Remember, some actions may be within your control, while others may require collaboration with your landlord. By taking these steps, you can create a healthier and more comfortable living environment in your apartment.
