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Find the exact size for your Lennox AC, heat pump or air handler in MERV 8, 11 and 13 — and buy it right here. We deliver free across Miami-Dade & Broward, install it for you, offer auto-delivery subscriptions, and ship anywhere in the USA.
Licensed Florida HVAC contractor (#CAC1817115). These are quality universal-fit replacement filters that fit Lennox systems by size — they are not Lennox-brand (OEM) filters.
Most Lennox systems use one of these common sizes. Tap yours to shop it right here.
Browse all sizes & MERV options →Buy the exact filter for your Lennox system, delivered and installed. Search or use the size finder below to jump to your size — we carry the full standard catalog (all standard sizes) in MERV 8, 11 & 13, plus 4-inch media and custom.
Our air filters fit Lennox AC units, heat pumps & air handlers — guaranteed to fit. Air filters are sized by W×L×D, not by brand, so a correctly-sized universal-fit filter fits every Lennox system perfectly. Just so you know: these are quality universal-fit filters that fit Lennox systems — they are not Lennox-brand (OEM) filters — so you get the perfect fit without paying the brand markup. Pick your size below (or let us confirm it) and it's the right fit, every time.
💰 Buy packs — save more per filter. Free shipping always · free local delivery within 3 days + free 1st-filter install on 6+ (Miami-Dade & Broward).
Never think about filters again. The right filter ships on your schedule, we swap it for you, and run an AC quick-check every visit. Subscribe & Save on every order — change or cancel anytime, no contract. You can also turn on Subscribe & Save on any product when you check out below.
Older home or non-standard return? Tell us your measurements and we’ll cut it to fit and deliver it.
Request a Custom Size →
No ladders, no guessing the size, no wrestling the old one out. Order online and a licensed local team member delivers your Lennox-fit filter to your door in Miami-Dade & Broward — and installs it on the spot, free. Out of the area? We ship it to you anywhere in the USA.
Watch what happens when you don’t change your AC filter regularly.
Lennox air filters are standard pleated HVAC filters sized to fit your Lennox central air, heat pump or air handler — Lennox does not use one universal size, so the filter you need depends on your system's return opening, not the brand name. The most common filter sizes that fit Lennox systems in Miami homes are 16x25x1, 20x25x1, 16x20x1, 20x20x5 and 20x25x5. Air Duct Cleaning Miami stocks every one of these sizes in MERV 8, 11 and 13, delivers free across Miami-Dade and Broward County, and installs them for you — first install free. Licensed FL HVAC contractor #CAC1817115, BBB A+.
One of the biggest myths about Lennox filters is that there's a single “Lennox size”. There isn't. Lennox builds a wide range of systems — the Signature, Elite and Merit series of central air conditioners and heat pumps, plus matching Lennox CBA and CBX air handlers — and the filter size is determined by the return-air opening on your specific unit or wall grille, not by the Lennox badge on the cabinet. Lennox also builds Armstrong Air and Ducane systems, which often take the same sizes. Two homes can both run Lennox and need completely different filters.
The fastest way to know your size: pull out the filter you have now and read the three numbers printed on the cardboard frame — width × length × depth, like 16x25x1. If you can't find a filter, measure the slot opening in inches. Below are the sizes we see most often on Lennox systems across Miami-Dade and Broward. Tap any size to shop it on this page.
| Filter Size (W×L×D) | Typical Lennox System | Shop |
|---|---|---|
| 16x25x1 | Many Lennox upflow air handlers & smaller homes | |
| 20x25x1 | Larger Lennox Signature & Elite central air returns | |
| 16x20x1 | Compact Lennox air handlers & closet installs | |
| 20x20x5 | Lennox Healthy Climate media-cabinet (5-inch) | |
| 20x25x5 | Lennox Healthy Climate media-cabinet (5-inch) |
Don't see your size? We source any size, including 4-inch media filters and custom. Call (305) 607-3244 and we'll identify it free.
On most Lennox systems the filter lives in one of two places. The first is a slot on the return-air side of the indoor air handler — typically a Lennox CBA unit in a closet, garage, attic or utility room. Look for a removable filter door or a slide-out slot near where the large return duct connects to the unit; on Lennox upflow and horizontal air handlers it's usually at the bottom or side intake. The second common location is behind a return-air grille on a wall or ceiling — if your home pulls air through a large grille, the filter slides in right behind it. Some Lennox setups with a Lennox Healthy Climate (5-inch) media-cabinet cabinet hold a thicker media filter in a dedicated housing next to the air handler.
Every pleated filter has an airflow arrow printed on the side, and it must point toward the blower / air handler — the same direction air is being pulled into the system, away from the return duct and toward the coil or furnace. In a Lennox air handler the arrow points toward the unit; behind a wall or ceiling return grille, the arrow points into the wall or ceiling. Installing a filter backwards collapses the pleats, restricts airflow and lets dust slip past — a small mistake that strains the blower and shortens the life of your Lennox system. When our technician installs your filter, we set the arrow correctly every time.
Lennox residential systems are designed around standard 1-inch filters, so the everyday sweet spot is MERV 8 to MERV 11. Go higher only when you have a reason — pets, allergies or asthma — and watch the airflow. Pushing a dense MERV 13+ filter into a standard 1-inch Lennox return can restrict airflow enough to ice the coil or overwork the blower motor. If you want hospital-grade filtration on a Lennox system, the right move is a thicker media filter in a Lennox Healthy Climate (5-inch) media-cabinet cabinet, which delivers high MERV without choking airflow. Not sure which way to go? Our AC maintenance team can check your Lennox's static pressure and recommend the safe maximum.
Everyday dust, pollen and pet dander. The safe default for most Lennox systems.
Step up for pets, kids or mild allergies on a Lennox AC or heat pump.
Fine particles, smoke and allergens — best in a Lennox media cabinet.
A filter from the hardware-store shelf is just a filter. We're a licensed Miami HVAC contractor who delivers the right one and installs it for you.
Bought the wrong size at the store before? We confirm your Lennox size first, so the filter always fits. No returns, no guessing in the aisle.
No driving to the store, no carrying a stack of filters. We deliver across Miami-Dade and Broward within 3 days, and ship anywhere in the USA.
A box-store filter still leaves you on a ladder. Our licensed technician installs it, sets the airflow arrow, bags the old one and takes it — first install free.
Put your Lennox filters on a 1, 2 or 3-month schedule. We bring the right size, swap it, and quick-check your AC every visit. Cancel anytime, no contract.
A dirty filter is the #1 cause of avoidable Lennox AC breakdowns in Florida — the U.S. Department of Energy reports a clogged filter can raise HVAC energy use 5–15%. On a Lennox system running year-round in Miami heat, a $7 filter pays for itself fast. Need more than filters? See our AC repair and air duct cleaning services.
Answer a few quick questions — we’ll match you to the right filter and the best way to get it, in about 30 seconds.
Tap any size to see its details, MERV options & price. We stock the full standard catalog in 1″, 2″ & 4″ — and cut custom sizes to fit.
Just the part that matters: what each one is best for, what it captures, and the price. Tap a tier to shop that rating in the catalog above.
✓ Every filter — delivered free across Miami-Dade & Broward, and we’ll install it for you.
| What it catches | MERV 8Standard | MERV 11Advanced | MERV 13Allergen | CarbonOdor Eliminator |
|---|---|---|---|---|
| Filtration efficiency | 90% | 95% | 98% | 90% + odor |
| Dust mites 10+ microns | ✓ | ✓ | ✓ | ✓ |
| Pollen 10–100 microns | ✓ | ✓ | ✓ | ✓ |
| Pet dander 5–10 microns | ✓ | ✓ | ✓ | ✓ |
| Lint & fabric fibers 10+ microns | ✓ | ✓ | ✓ | ✓ |
| Mold spores 3–10 microns | — | ✓ | ✓ | — |
| Fine dust & smoke 0.3–1 microns | — | — | ✓ | — |
| Odors / gases / VOCs molecular level | — | — | — | ✓ |
Buy more, save more. Example pricing for our most common size, 16x25x1 (MERV 8). The more filters per order, the lower the per-filter price — same goes for every size and MERV tier.
| Quantity | Price Each | You Save |
|---|---|---|
| 1 filter | $28.30 | — |
| 4-pack | $9.15 | 68% off |
| 6-pack | $6.83 | 76% off |
| 12-pack | $6.03 | 79% off |
Prices are per filter and vary by size and MERV rating. Free local delivery on every order across Miami-Dade & Broward.
These are the sizes most Miami homes and condos use. Don’t see yours? We source any size, including custom — just tap “Custom Size” or call us.
Standard depths: 1″, 2″ and 4″. Custom sizes available for older homes and non-standard returns.
Keeping up with your filter schedule is a hassle. Put it on auto-delivery and we handle it — the right filter, on your schedule, swapped for you.
South Florida is brutal on filters. Humidity, year-round pollen and constant AC runtime clog them faster than anywhere else. Here’s the right schedule.
A clogged filter forces your AC to work harder — the U.S. Department of Energy says a dirty filter can raise energy use 5–15%. In Florida, where AC is 40%+ of your electric bill, a $7 filter pays for itself. Not sure what your home needs? Our AC maintenance team can set your ideal schedule.
Real reviews from homeowners, condo residents and property managers who get their filters from us.
“I used to forget my filters for months. Now they come to my door on a schedule and the tech swaps it in five minutes. The MERV 11 they recommended cut down my allergies big time. Way easier than ordering a box online.”
“I manage 12 rental units in Doral. They deliver the right filter to each unit on a quarterly schedule and install them too. One vendor, one invoice, every unit covered. Saves me a full day every month.”
“My mom can’t reach her filter in her Hallandale condo. They bring the right MERV 11 for her allergies, install it, and check her AC every visit. Peace of mind for me, clean air for her.”
Everything you need to know about Lennox air filters — sizes, fit and delivery in Miami.
Local delivery within 3 days and install throughout Miami-Dade and Broward County. Don’t see your city? Call (305) 607-3244.
Order the right filter for your Lennox system now. We’ll bring the right size to your door, install it if you want, and take the old one with us. Set up auto-delivery and never think about filters again.
