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How do I know my air filter is working?
Most particles that your air filter is capturing are too small for us to see. So even if your filter "looks" clean, it's more likely that it is full of microscopic contaminants. That said, with time, your air filter will build up a layer of gunk (fro
Can you place a 1" filter in my larger 2", 3", or 4" wide slot?
Even though a 1" filter fits, we would not recommend using one as your HVAC unit was built to function with a wider filter. However, if you are looking for a larger filter, let us know by filling out this quick form. We are a small business trying to
When will my HVAC filters arrive?
Once placed, your order will typically ship from our warehouse within 1-2 business days. After that, you'll receive a tracking number from one of our carriers. Please note that your tracking number will work once the carrier (FedEx, UPS, or USPS) sca
How does Windmill reduce its carbon footprint?
Every time you buy a pack of Windmill filters, we’ll automatically purchase verified emissions reductions, more commonly known as “offsets,” on your behalf (at no additional cost to you). These offsets support environmental and sustainability project