Second Nature, formerly known as Filter-Easy, is an air filter subscription service that delivers air filters directly to your door. The company offers a wide variety of high-quality, pleated air filters of different sizes and thicknesses and also provides customizable filter options.

Second Nature Pros and Cons

Always free shippingLimited to one filter quality per subscription
Provides customizable filter sizes and a custom shipping scheduleAlso sells filters from other brands
Customers can select the number of filters their home requires in one shipment

How Does Second Nature Work?

Second Nature allows customers to select from more than 66,000 available filter options online. For your initial order, you’ll follow a five-step process and select answers to each question asked. Here are a few factors to consider before placing your Second Nature order.


You can select the exact number of filters in your home when placing an order.

Filter Dimensions

With Second Nature, you can select from a wide range of filters that have different thicknesses, including custom sizing options. It carries more than 66,000 available filter options online. If you don’t see your exact filter dimensions on the drop-down list, you can enter in the dimensions yourself. There’s also a “Find My Filter Sizes” button that shows you how to identify the dimensions on your existing filters.

Note: You can select filters of different sizes for the same order. If you have two air filters that are 12 x 12 x 1 and two that are 18 x 18 x 1, you can specify this and order them in the same package.

Filter Quality

Second Nature offers three different levels of filters: MERV 8, MERV 11, and MERV 13. The filters differ in what they filter out and their price point. Minimum Efficiency Reporting Value, or MERV, is the system that evaluates how efficient an air filter is based on how effective it is at trapping different-sized particles. A higher MERV rating correlates to a higher-capability filter.

Minimum Efficiency Reporting ValueMERV 8MERV 11MERV 13
Filters OutPollen, dust, mold, dust mites, and bacteriaPollen, dust, mold, dust mites, bacteria, and pet danderPollen, dust, mold, dust mites, bacteria, pet dander, smog, smoke, cooking oil, and virus carriers

All filters in a shipment must be the same quality. For example, you cannot choose for two out of the four filters to be MERV 8 and the remaining two to be MERV 13.

Shipping Frequency

You can choose to have filters shipped to you every month, every two months, or every three months, or you can set a custom shipping schedule. The custom schedule setting allows you to select the exact months you want your filters to arrive.

Second Nature suggests that air filters be replaced every three months to make sure your heating and cooling system runs well. The company also recommends that you replace your air filters every month if you have asthma or allergies, live in a highly polluted area, live in a very cold climate, or have multiple pets. Alternatively, you can replace your filters every two months if you have one filter in your home, use your heating and cooling year-round, or own a pet.

According to Second Nature’s Help section, you can set up different schedules for different filters. Simply go to your account and select “add subscription” to your profile and enter the schedule details.

Note: You can select the exact date you want your first shipment to arrive and Second Nature will charge you only once your order has been generated.

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How Much Does Second Nature Cost?

Customers are charged for the filters they select based on the frequency of shipping. Since Second Nature offers several options for your home’s specific needs, exact pricing ranges from $10–$26 per filter with special pricing for custom sizes and thicker filters.

Changing your filters on time every time can save you 5-15% on your heating and cooling bill and prevent expensive HVAC repairs.

Note: There are no membership fees or commitments that you pay outside of the cost of the air filters.

Get started with your air filter from Second Nature by visiting the company’s website.

How Does My Subscription Work?

When you sign up for your Second Nature subscription, you’ll set up an account where you can manage and edit your details. You can delay any upcoming shipments or cancel your subscription with no penalty. According to Second Nature, you can resume or reactivate your account with one click whenever you’re ready.

Customer Reviews

Second Nature is not accredited by the Better Business Bureau (BBB), but it holds an A+ rating from the organization and is also highly rated on Trustpilot.

Here are a few Second Nature reviews left by customers:

“I have loved Second Nature since I heard about them, and love them more after today. I had a question about a current order, and I called and was only on hold for about 1 minute. I connected with Dave and he could not have been nicer. Great customer service and a great company!” — Bridget V.

“Service was always good and it was easy to set up a subscription. Recently I was sent the wrong size air filter. I had to send a message three separate times to get any sort of response. They apologized for the inconvenience and stated they would send a replacement. I thought great, but quickly was disappointed because they didn’t expedite the replacement air filter. I received the replacement a month after finally getting a response from a rep, but was still charged in full.” — Brett M.


You need to change your filters several times each year, but it’s hard to always remember when to replace them or what your sizes are. Second Nature’s service makes it easy to stay on top of this chore, offering high-quality air filters in a variety of sizes.

We also like that customers can customize when their air filters arrive. This service is also convenient for customers who need to order several different-sized filters in one order. One downside to Second Nature is that customers can’t order several different qualities of filters per order.

Check prices and purchase the Second Nature air filter that’s customized for your needs by visiting the website.

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Frequently Asked Questions

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