Filters you don’t think about. Smart reminders, bulk savings.
Annual subscriptions from $52
30% off your first year
Free text reminders to change your filter
100% carbon neutral
4.9
399 reviews
Filters you don’t think about. Smart reminders, bulk savings.
Annual subscriptions from $52
30% off your first year
Free text reminders to change your filter
100% carbon neutral
4.9
399 reviews
Your auto-refill filter plan:
Regular price
First year promo applied
Set it and forget it,
we’ll keep you cool.
Free Text Reminders
No more remembering when to replace your filter. We'll text you when it's time
Free Carbon Offsets
We buy carbon offsets when you check out so your filters ship 100% carbon neutral
Why Windmill?
Proven Quality
Made in the USA with the #1 filter media manufacturer in the world
Clean Air
A new air filter delivers fresh, clean air and also protects your HVAC from costly repairs
We Got You
Any questions at all, we're here for you. Chat or email us anytime. We mean it.
What filter is right for me?
MERV stands for minimum efficiency rating value. It’s a nationally recognized measurement system that’s used to rate every air filter.
Click the filter type below to see what different MERV types can filter
Dust
Pollen
Mold
Smog
Dander
Bacteria
Oils
Viruses
Smoke
Standard
MERV 8
High
MERV 11
Medical
MERV 13
How do I find my filter size?
There are two easy ways to find your filter size:
The frame of your air filter may have the size printed on it.
Use a tape measurer to measure your filter or vent slot and round up to the nearest inch.
How often should I change my filter?
Replace your filter every 2 months (6 filters in pack) if you have any of the following in your home:
- Pets that shed
- People that suffer from allergies (or other respiratory illnesses)
- Poor air quality in surrounding area
- Frequent use of household items that release VOCs: candles, air fresheners, cleaning products, etc
- An older HVAC unit
If the above doesn’t describe you, you’re likely OK with a 4-pack and changing every 3 months.
