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No. 1" air filters were not built to be stacked and doing so significantly reduces airflow.

Should I layer my 1" filters?

Products

HVAC Filters

What makes the Windmill AC unique?

Will the Windmill AC work in my window? Can I use it through the wall?

What are the technical specs for the AC?

FAQs

Where can I find the installation guide and owner's manual for my AC?

How do I install my Windmill AC?

How do I install the carbon filter?

How do I insert the activated carbon filter?

Do you have tips for plexiglass installation?

Do I need a support bracket?

How do I install the AC in a storm window?

How do I install the cosmetic side panels?

How do I uninstall my AC?

What do I do if my AC is leaking?

Installation

What is the red circle on the display?

How do I clean and maintain my AC?

How do I clean and replace the filters?

Is there a drain hole?

Cleaning & Maintenance

What makes the Windmill fan unique?

How can I get the most out of my fan year round?

What are the technical specs to the Fan?

What square footage is the Windmill fan best for?

Can it be mounted on the wall?

Can I adjust the height of the fan?

Can I use my Windmill fan outdoors?

Does the Windmill fan oscillate?

Where is the Fan Manual?

What outlet does the Windmill Fan require?

How many fan speeds are there?

How do I operate the fan?

How do I clean the fan?

Fans

What makes Windmill purifiers different from other purifiers?

What are the technical specs to the Air Purifier?

Why do I need a purifier?

How does the Windmill purifier work?

What does the Windmill Air Purifier actually purify?

How fast can the Windmill purifier clean my air?

Where should I place my purifier?

What special smart features does the Windmill purifier have?

Does air quality affect asthma and allergies?

What size room is the Windmill purifier best for?

Can I leave my air purifier on all the time?

Does the Windmill purifier require a wifi connection to operate?

Is the Windmill purifier loud?

What does laser precision refer to?

What is CADR?

What is AQI?

Where can I find the Air Purifier manual?

Purifier FAQs

What filters do I need to use with the Windmill purifier?

What is a 3-in-1 HEPA filter?

How many filters are in the Windmill purifier?

How does the filter reduce odors and smoke?

What happens if I don't replace filters in an air purifier?

How do the replacement filter refills work?

What is HEPA?

Filter FAQs

How often should I change my filter?

How do I replace my filter?

Air Purifiers

Do I need to be concerned about airflow?

What is the difference between the Windmill filters?

Will Windmill Filters help my allergies?

Are Windmill Filters good for pet owners?

Which Windmill filter is best for me?

What particles do Windmill filters capture?

What sizes do you offer?

Why does Windmill ship in bulk?

Can I buy just 1 filter?

How does the quiz work?

Are Windmill Filters recyclable?

How do I store my filters?

Can I wash and reuse my filters?

How do I dispose of my filters?

How do I change/install my air filter?

What are the product details?

What makes Windmill filters unique?

Where are Windmill Filters made?

How do I sign up for text reminders?

How do text reminders work?

How do I know my air filter is working?

Can you place a 1" filter in my larger 2", 3", or 4" wide slot?

How does Windmill reduce its carbon footprint?

What is an air filter?

Do I need an air filter?

How does an air filter work?

What are the benefits of an air filter?

Why do I need to change my air filter?

When should I change my air filter?

Where is the air filter in my home?

Can I use a HEPA filter in my furnace?

What is MERV? What about MFR and FPR?

How does where you live affect what air filter I should use?

Why are there different size air filters?

How do I know my air filter size?

What is the difference between fiberglass and pleated air filters?

What is the difference between an Air Filter and an Air Purifier?

HVAC Filters 101

Where can I manage my account and auto-refills?

How do I contact customer support?

How do your annual auto-refills work?

When will my HVAC filters arrive?

Orders - HVAC

What is Mulberry?

What is included in the Mulberry Protection Plan?

Do I qualify for Mulberry Protection Plan options?

How do I purchase a protection plan?

Mulberry Product Protection Plan

How can I use HSA/FSA funds for the Windmill Purifier?

Do I need to pay taxes on my order?

Can I cancel or change an order after it's been placed?

How can I track my order?

I placed my order but didn't receive my confirmation email. What do I do?

Orders

When exactly will my order arrive and how much is shipping?

Where does Windmill ship?

Do you deliver on Saturdays and Sundays?

Do I need shipping insurance protection? How do I file a claim with Onward?

Shipping

Orders & Shipping

How do I register my Windmill product for the included warranty?

Does the Windmill AC come with a warranty?

What is the warranty for the Windmill Fan?

What is the warranty for the Windmill Air Purifier?

Warranty

What is your return policy?

Returns

Warranty & Returns

Where is your end user agreement for the app?

What are the mobile app features for my AC?

How can I pair my AC to the app?

Can I control the Windmill AC remotely?

Do you have troubleshooting tips for connecting to the app?

How can I connect my Windmill AC to my smartphone?

How can I connect my AC to my Alexa?

How can I connect my AC to my Google Home?

How can I use Alexa to control my Windmill AC?

How can I use my Google Home to control my Windmill AC?

How can I reset my app?

How do I connect my fan to the app?

Mobile App

What are activated carbon filter auto-refills?

How often will I be billed for my filter subscription?

How do I manage my filter subscription?

Subscriptions

Is the Windmill AC more eco-friendly?

How can I use my AC more efficiently and save on my energy bill?

How does the carbon offset program work?

What is R32?

What is Windmill's Eco Rewards Program?

What if I need to reset my utility login to sign up for Eco Rewards?

Eco Rewards

What makes the Windmill fan more eco friendly?

How does the fan help lower my energy use?

What does it mean that your fan has internal parts made with 50% recycled materials?

Sustainability

Should I layer my 1" filters?Updated a year ago