How to Change the Filter on a HoMedics Air Purifier in 2026

Changing the filter on your HoMedics air purifier in 2026 is quick and essential for optimal performance—simply power off the unit, remove the back panel, and slide out the old filter. Replace it with a genuine HoMedics HEPA or carbon filter, ensuring it’s seated correctly before reassembling. Regular filter changes every 3–6 months keep your air clean and your purifier running efficiently.

Key Takeaways

• Turn off and unplug the air purifier before starting any filter replacement.
• Locate the filter compartment by checking the back or side panel of your model.
• Remove the old filter carefully to avoid spreading dust or debris.
• Install the new filter with the airflow direction arrows pointing correctly.
• Reset the filter indicator if your model has one, to ensure accurate monitoring.
• Replace filters every 3–6 months for optimal air quality and performance.
• Use genuine HoMedics filters to maintain efficiency and warranty coverage.

Why Replacing Your HoMedics Air Purifier Filter Matters

Imagine this: You’ve just spent a quiet evening reading a book, breathing in what you thought was clean, crisp air. Then you glance at your HoMedics air purifier and notice the indicator light flashing red. It’s been months since you last thought about the filter, and suddenly you realize—your air might not be as fresh as you believed. I’ve been there. That moment of realization hit me when my allergies started acting up again, despite running my purifier religiously. The culprit? A clogged, overdue filter.

Air purifiers are only as good as their filters. Over time, dust, pet dander, pollen, and even cooking odors get trapped in the filter media, reducing efficiency and, in some cases, releasing trapped particles back into the air. HoMedics air purifiers are popular for their affordability and compact design, but like all purifiers, they require regular maintenance to deliver on their promise of cleaner air. In 2026, with more people working from home and air quality concerns on the rise, keeping your purifier in top shape isn’t just about comfort—it’s about health. And the best way to do that? Knowing how to change the filter on a HoMedics air purifier the right way.

Whether you own a HoMedics AP-25, AP-35, AP-50, or another model, the process is simple once you know the steps. But don’t be fooled by the simplicity—there are nuances that can make or break the performance of your unit. In this guide, I’ll walk you through everything you need to know, from identifying your model to safely installing a new filter, with real-world tips I’ve picked up after maintaining my own HoMedics purifier for over three years.

Step 1: Identify Your HoMedics Air Purifier Model

Check the Label on the Back or Bottom

Before you even think about opening your purifier, you need to know which model you have. HoMedics has released several air purifier models over the years, and filters are not interchangeable between models. Using the wrong filter can reduce performance or even damage the unit.

Flip your purifier over or look at the back panel. You’ll usually find a label with the model number, serial number, and manufacturing date. Common models include:

• HoMedics AP-25 (Compact, ideal for small rooms)
• HoMedics AP-35 (Mid-size, great for bedrooms)
• HoMedics AP-50 (Larger capacity, for living rooms or open areas)
• HoMedics AP-T20 (Tower-style with HEPA and carbon layers)
• HoMedics AP-45 (Smart model with app connectivity, popular in 2025–2026)

I once bought a generic “HEPA” filter online without checking the model—big mistake. It didn’t fit the AP-35, and I wasted $30. Lesson learned: Always double-check the model number.

Why Model Matters for Filter Replacement

Each HoMedics model uses a specific filter configuration. Some have a 2-in-1 HEPA + activated carbon filter, while others use a 3-stage system with a pre-filter, HEPA filter, and carbon layer. For example:

• The AP-25 uses a H13 HEPA filter with a built-in carbon layer.
• The AP-50 uses a separate pre-filter and HEPA filter, allowing you to clean the pre-filter more frequently.
• The AP-45 includes a smart filter sensor that tracks usage and sends alerts via the HoMedics app.

Using the correct filter ensures optimal air flow, filtration efficiency, and longevity of your purifier. If you’re unsure, take a photo of the label and email it to HoMedics customer support—they’re surprisingly responsive and can confirm the right filter for you.

Step 2: Gather the Right Tools and Supplies

Essential Items You’ll Need

Changing a filter isn’t rocket science, but having the right supplies makes the process smoother and safer. Here’s what I keep in my “air purifier maintenance kit”:

• New filter(s) specific to your model (buy genuine HoMedics filters when possible)
• Clean microfiber cloth (to wipe down the interior)
• Vacuum with a soft brush attachment (for cleaning the pre-filter, if applicable)
• Small flashlight (to inspect for debris or dust buildup)
• Disposable gloves (optional, but helpful if you’re sensitive to dust)
• Trash bag or bin (to dispose of the old filter properly)

I learned the hard way that using a regular household vacuum without a brush attachment can scratch the plastic housing. A soft brush is gentle and effective. Also, always unplug the purifier before starting—this isn’t just a safety tip; it’s a necessity.

Where to Buy Replacement Filters (and What to Avoid)

You can buy HoMedics filters from:

• HoMedics official website (most reliable)
• Amazon (check seller ratings and look for “sold by HoMedics” or authorized dealers)
• Home improvement stores like Lowe’s or Home Depot (in-store availability varies by region)

Pro tip: Avoid third-party “generic” filters unless they’re explicitly certified for your model. I tried a cheap off-brand filter once—it fit, but airflow dropped by 30%, and the unit started making a strange whistling noise. After a week, I switched back to the genuine HoMedics filter and noticed an immediate improvement in air quality and noise level.

For 2026 models like the AP-45, HoMedics has introduced eco-friendly filters made from recycled materials. These are slightly more expensive but reduce environmental impact. If sustainability is a priority for you, these are worth the extra cost.

Step 3: Power Off and Remove the Old Filter

Safety First: Unplug the Unit

Before touching anything, unplug the purifier from the wall outlet. Even if the unit is off, residual power can pose a risk. I once forgot this step and got a small static shock when I touched the internal fan—not dangerous, but definitely a wake-up call.

Let the purifier sit for 5–10 minutes to cool down if it’s been running. This is especially important for models with UV-C lights (like the AP-50), which can generate heat.

Accessing the Filter Compartment

Most HoMedics air purifiers have a rear or side panel that slides or lifts open. Here’s how it works for common models:

• AP-25/AP-35: Press the release button on the back and slide the panel upward.
• AP-50: Twist the locking knob clockwise and pull the panel straight out.
• AP-T20: Press both side tabs simultaneously and lift the top cover.
• AP-45: Tap the “Filter” icon on the touchscreen to unlock the panel (yes, it’s that smart).

Once the panel is open, you’ll see the filter(s). Some models have a pre-filter wrapped around the main filter—don’t throw this away! It can often be cleaned and reused.

Removing the Old Filter (With Care)

Gently pull the filter straight out. Avoid yanking or twisting, as this can damage the filter housing. If it’s stuck, use a flashlight to check for dust buildup or misalignment.

Here’s a real-life example: My AP-35 filter was caked with dust and pet hair after 8 months. I used a soft brush to loosen the debris around the edges before pulling it out. The filter came free without any force, and I avoided scratching the plastic.

As you remove the old filter, take a moment to inspect it. A healthy filter should be gray or tan with visible dust buildup. If it’s black, slimy, or smells musty, it’s past its prime and possibly growing mold—dispose of it immediately in a sealed bag.

Step 4: Clean the Interior and Pre-Filter (If Applicable)

Wipe Down the Filter Housing

Before inserting the new filter, clean the interior. Use a microfiber cloth to wipe away dust, pet hair, or debris. Pay special attention to the corners and the fan area—these spots often collect gunk that can affect airflow.

I keep a small handheld vacuum nearby to suck up loose particles. For stubborn dust, a slightly damp cloth works, but make sure the unit is completely dry before reassembling. Moisture can damage electrical components or encourage mold growth.

Clean or Replace the Pre-Filter

Many HoMedics models (like the AP-50 and AP-45) have a reusable pre-filter designed to catch large particles like pet hair and dust. This is usually a mesh screen that wraps around the main filter.

To clean it:

• Remove the pre-filter from the main filter.
• Rinse it under cool water (no soap—it can degrade the mesh).
• Gently shake off excess water and let it air-dry for at least 2 hours.
• Reattach it to the new filter or place it back in the housing.

If the pre-filter is torn, frayed, or discolored, replace it. HoMedics sells pre-filter packs for most models. I clean mine every 4–6 weeks, which extends the life of the main HEPA filter by 30–40%.

Pro tip: Mark your calendar or set a phone reminder to clean the pre-filter. I use a recurring monthly alert—it’s saved me from premature filter replacements more than once.

Check for Other Maintenance Needs

While the filter is out, take a quick look at other components:

• Fan blades: Use a dry cloth to wipe off dust.
• UV-C lamp (if equipped): Gently clean the glass with a cotton swab and isopropyl alcohol (70%).
• Air intake grille: Vacuum or wipe to ensure no blockages.

One time, I found a dead moth stuck in the intake of my AP-50. No wonder the airflow had been weak! A quick cleanup restored full performance.

Step 5: Install the New Filter and Reassemble

Insert the New Filter Correctly

Now for the easy part—installing the new filter. But don’t rush it. Filters have a specific orientation, and installing them backward can reduce efficiency or damage the unit.

Look for arrows or labels on the filter frame. These indicate the direction of airflow (usually “Front” or “Inlet”). The filter should sit flush against the housing with no gaps. If it doesn’t fit, double-check the model number—you might have the wrong size.

For 2-in-1 filters (HEPA + carbon), the carbon layer usually goes toward the back. For models with a separate pre-filter, attach it to the main filter or place it in the designated slot first.

Reattach the Filter Panel and Power On

Once the filter is in, carefully close the panel. Make sure it clicks or locks into place. For twist-lock models like the AP-50, turn the knob counterclockwise until it’s snug.

Plug the purifier back in and power it on. Most models will have a filter reset function:

• AP-25/AP-35: Press and hold the “Filter” button for 3 seconds.
• AP-50: Press the “Reset” button on the control panel.
• AP-45: Tap “Filter Reset” in the HoMedics app or on the touchscreen.

After resetting, the filter indicator light should turn green or blue, indicating a fresh filter is installed.

Test the Airflow and Listen for Issues

Run the purifier on high for 5–10 minutes. Feel the airflow at the top—it should be strong and consistent. Listen for unusual noises like grinding, rattling, or whistling. These can indicate improper installation or a damaged filter.

I once installed a new filter but forgot to remove the plastic packaging. The purifier ran for a day before I noticed the airflow was weak. Once I removed the plastic, performance returned to normal. Always check that the filter is unwrapped!

How Often Should You Change Your HoMedics Filter? (And Other Maintenance Tips)

Recommended Filter Replacement Schedule

HoMedics recommends replacing filters every 6–12 months, depending on usage and air quality. But your environment plays a big role. Here’s a quick guide:

Environment	Filter Change Frequency	Pre-Filter Cleaning
Low traffic, no pets, rural area	Every 10–12 months	Every 8 weeks
Moderate traffic, 1–2 pets, city	Every 6–8 months	Every 4–6 weeks
High traffic, multiple pets, smoking, construction nearby	Every 4–5 months	Every 2–3 weeks
Allergies or respiratory conditions	Every 4–6 months (consider premium HEPA)	Every 2–4 weeks

For example, I live in a city apartment with two cats and a partner who cooks a lot. I change my AP-35 filter every 5 months and clean the pre-filter every 3 weeks. In 2025, I upgraded to the AP-45 with a smart sensor, which alerts me when the filter reaches 80% capacity—super helpful.

Signs Your Filter Needs Changing (Even Before the Light Comes On)

Don’t rely solely on the indicator light. Watch for these signs:

• Reduced airflow (feels weaker at the same fan speed)
• Increased noise (whistling or rattling)
• Persistent odors (smoke, pet smells, cooking)
• Worsening allergy symptoms
• Visible dust buildup on the filter surface

I noticed my allergies spiked in winter, even with the purifier running. I checked the filter and found it was 7 months old and covered in dust. After replacing it, my symptoms improved within 48 hours.

Bonus Tips for 2026 and Beyond

• Use the HoMedics app (for AP-45 and newer models): Track filter life, set reminders, and receive air quality tips.
• Buy filters in bulk: HoMedics often offers 2-pack or 3-pack discounts, saving you money over time.
• Keep a log: Note the date of each filter change. It helps you track usage and plan replacements.
• Consider a backup filter: If you live in a wildfire-prone area or have seasonal allergies, having an extra filter on hand is a lifesaver.

Knowing how to change the filter on a HoMedics air purifier is a small task with big benefits. It’s not just about keeping your machine running—it’s about protecting your health, saving money on replacements, and ensuring the air you breathe is truly clean.

Final Thoughts: Clean Air Starts with a Clean Filter

Changing your HoMedics air purifier filter might feel like a minor chore, but it’s one of the most impactful things you can do for your indoor air quality. I’ve seen the difference firsthand—fewer allergy attacks, better sleep, and a noticeable freshness in the air. And in 2026, with climate change affecting air quality globally and more of us spending time indoors, this maintenance step is more important than ever.

Don’t wait for the red light. Don’t skip cleaning the pre-filter. And definitely don’t use the wrong filter. With the right tools, a little attention to detail, and the steps I’ve shared, you can keep your HoMedics purifier running at peak performance for years.

So the next time you see that filter light blink, don’t panic. Grab your supplies, follow this guide, and take back control of your air. Your lungs—and your family—will thank you.

Frequently Asked Questions

How do I know when to change the filter on my HoMedics air purifier?

Most HoMedics air purifiers have a built-in filter replacement indicator light that turns on when the filter needs changing (usually every 3–6 months). You can also monitor performance—if airflow weakens or odors return, it’s likely time to replace the filter.

Where can I buy a replacement filter for my HoMedics air purifier?

Replacement filters are available on the official HoMedics website, Amazon, and other major retailers like Walmart or Best Buy. Always ensure you’re purchasing the correct model-specific filter to maintain optimal performance.

How to change the filter on a HoMedics air purifier without damaging the unit?

Start by unplugging the purifier and removing the front or back cover (varies by model). Gently pull out the old filter, dispose of it, and insert the new one with the airflow arrow pointing inward. Secure the cover back in place.

What happens if I don’t change the HoMedics air purifier filter on time?

A clogged or expired filter reduces air cleaning efficiency and can strain the motor, shortening the device’s lifespan. It may also release trapped pollutants back into the air, worsening indoor air quality.

Are all HoMedics air purifier filters the same size or type?

No, filter size and type vary by model—some use HEPA filters, others include carbon or pre-filters. Always check your user manual or the label on the existing filter to match the correct replacement.

Can I clean and reuse my HoMedics air purifier filter instead of replacing it?

Most HoMedics filters (especially HEPA and carbon) are not designed to be cleaned or reused. Washing or vacuuming them can damage the fibers and reduce effectiveness—always replace with a new filter.