WE ARE OPEN! All filters are made in the USA in our Alabama warehouse.

Air Filter Discount Codes and Coupons:


Get 5 dollars off your next Filter King order use coupon code: 5off to get $5 off your next order. Click here to see our Filter Sizes.

Get a FREE Coupon Code for ANY Filter in our Entire inventory

Just use code 5off at checkout.

Struggling with your non-standard filter size?

We know how frustrating it can be to find the right fit for your filter.

Especially when your home has a non-standard air filter size.

That’s why we stock over 320 non-standard filter sizes.

But it’s not just that.

When you buy from Filter King, you can know you are buying great quality.

There are so many low-quality filters already on the market. And we didn’t want to add to the problem.

We believe you should have good, clean air in your home — no matter what filter size you have.

And so, along with stocking all kinds of non-standard sizes, we sell only the best and safest quality filters for you and your loved ones.

That way, you can buy with confidence.

And with our easy to use survey tool, you can quickly find the right fit.

What others are saying?

We believe in providing the best product for you.

And we believe every filter buying experience should be:

  • easy to find your size
  • fast delivery to you
  • and kind and respectful to you

But we don’t want you to just take our word for it.

Rebecca, one of our customers who gave us a five-star rating, wrote:

“I received my order very quickly. The owner personally reached out to me to see if I needed any assistance. Our house is up for sale and I will be referring the new owner to Filter King!!”

Andres, another customer, had an issue with his custom order:

“I had some filters customized and were received in no time. Unfortunately, I did have an issue with the measurements so I contacted them. They heard me out and were quick to fix it. This had to be one of the best customer services out there. Without a doubt, great quality/value and I'll be ordering from Filter King again.”

Samuel, who left a five-star review, had been struggling with allergies:

“The filters really filter out everything I need them to. No more runny nose, and sore throat in the morning!”

But beyond odd sizes, what about special cases?

Sometimes, the average isn’t good enough.

Our MERV 13 filters are ideal for anyone with a newborn baby in their house. Because babies are more susceptible to indoor air pollution.

But also, if you have chronic or severe breathing problems, we make filters for you.

This would include:

  • Allergies
  • Asthma
  • COPD
  • Emphysema
  • Chronic bronchitis
  • Lung disease

And anyone in the household who requires the use of an inhaler, oxygen tank, or ventilation machine, would also fall into this category. They are also recommended for people with weakened immune systems who may be affected by airborne pathogens and viruses.

Find Quality Air Filters at the Lowest Price

We offer a ridiculous amount of custom sizes. It’s true.

And that can be overwhelming.

We know.

So we’ve created this super-easy survey tool to guide you through the process.

It’ll only take you a few seconds. Then, you’ll be on your way to a cleaner, healthier air in your home.

Just click here to get started.

And because we don’t want you to miss anything...

Use the coupon code 5off at checkout.


Discount Air Filters Review

Get 5 dollars off your next Filter King order use coupon code: 5off to get $5 off your next order. Click here to see our Filter Sizes.



Discount Air Filters Overview

If someone needs or wants a new air or furnace filter, or they want an upgrade to their current filter, then a discount air filter is a smart choice. It is recommended that houses and residential buildings use air filters with a MERV rating of at least 6.

MERV means Minimum Efficiency Reporting Value and refers to how efficient the filter is at trapping pollutants and allergens. If your air filter has a lower rating then it is advisable to upgrade to a cheap air filter for the home that will create a healthier indoor environment.

Features to Look for in Discount Air Filters

Affordability - A cheap air filter should be a good deal. Make sure that the discount is significant enough that purchasing the filter will not have a negative effect on the household budget.

Quality - An air filter with a high MERV rating is recommended, preferably one between 8 and 13. It will catch the allergens and pollutants commonly found in most residential areas.

Reliability - Air filters need to be changed occasionally but they should not need to be changed before their expiration date because they stopped working properly.

Performance Expectations of Discount Air Filters

Just because an air filter is inexpensive, that doesn’t mean that it should offer below par performance. A cheap home air filter should perform according to its MERV rating. If a discount air filter with a MERV rating of 6 lets in pollen or mold then it is not working according to its specifications. If an air filter performs below the level of its rating, then the situation needs to be rectified as soon as possible.

Recommended Discount Air Filter Purchases

The average person - An air filter with a MERV rating of at least 6. Anything below this rating is not as efficient at filtering out everyday particulates, like dust or pollen.

The person with special needs - If you, or someone in the family, has breathing problems or severe allergies, or if you have a newborn child, then air filters with a MERV rating of 8 to 13 are highly recommended. They will filter out most bacteria and virus carrying agents.

Recommended Buyers of Cheap Air Filters

Anyone on a tight budget who values a clean indoor environment provided by a cheap air filter for the home

Bargain seekers who are waiting for the right time to purchase a discount air filter to upgrade their current filter

Discount Air Filters: Conclusion

A discount air filter is a great deal for anyone who needs to upgrade their current air or furnace filter to one that is more efficient. Filters with higher MERV ratings tend to be more expensive but they are worth it for the extra filtration they provide.

If the opportunity to purchase a quality cheap air filter for the house comes along then it should not be missed. A good air filter is a sound investment that helps to preserve the air quality of the home and the respiratory health of the people who live there.


Discount Furnace Filters Review

Get 5 dollars off your next Filter King order use coupon code: 5off to get $5 off your next order. Click here to see our Filter Sizes.



Discount Furnace Filters Overview

Just because a discount furnace filter is cheap, that does not mean that it should be cheaply made. A good air filter, regardless of the price, will trap a wide variety of allergens and pollutants, ensuring that the indoor air quality is of a high standard. This is particularly important if there are any allergy sufferers, asthmatics, or newborns in the home.

If you ever have the opportunity to buy a cheap air filter, then you should make sure that it has a MERV rating with a minimum of 8 and a maximum of 13. Anything lower than an 8 will not be as efficient and anything higher than a 13 could reduce the airflow, causing the furnace fan to work harder, which in turn results in a higher energy bill. Therefore, great care should be taken when purchasing a furnace filter no matter the price.

Features to Look For in Discount Furnace Filters

Even a cheap furnace filter should be able to filter out a large amount of pollutants, especially the ones that can trigger an allergy or asthma attack. These are some of the most important pollutants that a good furnace filter should catch:

  • Dust
  • Dust mites
  • Pollen
  • Pet dander
  • Mold spores
  • Exhaust fumes
  • Tobacco smoke

If you are lucky enough to get a discount furnace filter coupon, then hose are the particulates, pollutants, and allergens that you want your furnace filter to prevent from circulating.

Performance Qualities of Discount Furnace Filters

A good discount air filter will help to create a clean indoor air environment for everyone in the residence and should also help to lower the energy bill of the home. A high quality discount furnace filter should also be available in a variety of sizes to fit a variety of systems.

Since furnace filters should be cleaned regularly to keep them operating at peak efficiency, they should be able to endure multiple cleanings without degrading in quality. Finally, they should be simple to maintain and simple to replace when the time is right.

Recommended Buyers of Discount Furnace Filters

  • Anyone who wants to save on a quality air filter
  • Anyone who needs an air filter to stop allergens from circulating
  • Anyone who wants to save on their electricity bill
  • Anyone with a newborn in the house

Discount Furnace Filters Review: Conclusion

If a discount furnace filter becomes available, you should get one with a high MERV rating. Such an air filter will help to improve the indoor air quality of the home. They should also help to save you money on your energy bill. A furnace filter is a valuable investment for the home, so if the chance to buy a cheap furnace filter comes along, it is important to get one that is high quality.

It is also important to get one that will last a long time, there should not be any reason to replace the filter soon after it has been purchased. If those criteria are all met, then the furnace filter that has been purchased will continue to perform at a high level for a very long time.


Furnace Filters on Sale


Furnace Filters on Sale Background

Furnace filters are an important part of the home’s HVAC system. You should always try to get the best air filter possible. Filters with a MERV rating between 8 and 11 are best for most homes. They tend to be more expensive, so if you should ever find a furnace filter on sale, then you should purchase one of the better ones.

MERV means Minimum Efficiency Reporting Value and it indicates how efficient the air filter is at trapping particles. Even if a furnace filter with a high MERV rating is not essential, purchasing one if it is on sale is a good investment for any home.

Features to expect in Furnace Filters on Sale

Should one decide to purchase a high MERV-rated furnace filter if it is on sale, then here are some of the allergens and pollutants it will filter out and keep from circulating:

  • Household dust
  • Pollen
  • Dust mites
  • Carpet fibers
  • Mold spores
  • Hair spray
  • Exhaust fumes

Furnace filters with MERV ratings of 8 to 11 will prevent all of the above particulates from circulating. Filters with lower ratings, in the 1 to 7 range, will not trap finer particulates like exhaust fumes. Nevertheless, they should be more than adequate for most people.

How Furnace Filters on Sale should Perform

Furnace filters with a MERV rating of 7 or 8 will provide a good balance of cost and efficiency, they will catch 80% to 95% of particles that are larger than 5 microns. This is efficient enough for most households.

However, homes with more sensitive allergy sufferers should opt for furnace filters with MERV ratings of 9 to 11. Those filters are more efficient and will make the home environment more palatable for them. One caveat is that the furnace fan will have to run full time to get the benefit of the filter.

This will end up costing more so that should be taken into account even if the furnace filter is on sale. Residential homes do not need to go any higher than a MERV rating of 11 because anything higher will lower the airflow, causing the air conditioner’s fan to work harder. The end result is a higher utility bill and possibly worse if the fan gets broken and needs to be replaced.

Recommended Users for Furnace Filters on Sale

Recommended Users for MERV 7 to 8 Rated Furnace Filters

  • Average person(s) with no significant allergies
  • Frugal buyers who don’t need the extra filtration
  • Buyers who want to save money on the air filter and on furnace fan operating costs

Recommended Users for MERV 9 to 11 Rated Furnace Filters

  • Person(s) with severe allergies who need the extra filtration
  • Households that have members with compromised immune systems
  • Anyone who does not mind paying extra for the cleanest air possible

Furnace Filters on Sale: Conclusion

If you are in the market for a furnace filter and come across some furnace filters for sale, then you should endeavor to make the choice that best suits your home and the people who live there. It is tempting to buy the highest MERV rated furnace filter, but that is not always necessary and could even be detrimental to the HVAC system.

The best thing to do if you are unsure of which furnace filter to buy is to think about the needs of your household. If necessary, you can get some advice from any air filter expert you can find. They will be able to quickly set you on the right path to purchasing the furnace filter that perfectly suits your needs.


Furnace Filters On Sale Review Outline


Furnace Filters on Sale Overview

One of the first things to consider when buying a furnace filter that is on sale is its MERV rating. MERV means Minimum Efficiency Reporting Value and refers to how well the filter traps harmful particles. MERV ratings go from 1 to 20, with 1 being the least efficient and 20 being the most. The average household needs a furnace filter in the 8 to 13 range.

Filters below that range are not as efficient, while filters above that range have smaller pores that could restrict the airflow of the HVAC system. This could result in the fan having to work harder, which could in turn result i a rise in the owner’s energy bill. Furnace filters in the 8 to 13 range are good enough to trap the majority of pollutants and allergens that can trigger adverse reactions in affected individuals. So, when you have the chance to buy a furnace filter on sale, make certain that it fits the needs of your home.

The Key Features to Look for in Furnace FIlters on Sale

When purchasing a furnace filter on sale, these are the particulates that it should be capable of blocking depending on the MERV rating:

  • MERV 8 - Pollen
  • MERV 8 - Dust
  • MERV 8 - Dust mites
  • MERV 8 - Pet dander
  • MERV 8 to 11 - Mold spores
  • MERV 8 to 11 - Exhaust fumes
  • MERV 8 to 13 - Tobacco smoke
  • MERV 8 to 13 - Smoke
  • MERV 8 to 13 - Some bacteria
  • MERV 8 to 13 - Droplet nuclei (droplets from a cough or a sneeze)

Expected Performance of Furnace Filters on Sale

A good furnace filter should improve the air quality inside of the home and should help prevent allergy sufferers from experiencing any severe and/or frequent attacks. Higher rated filters should help prevent the spread of bacteria and viruses of sick individuals from traveling through the HVAC system and infecting the rest of the family.

This should help to reduce the rate of infection within a household. They should also reduce energy costs by using less power to draw air through the HVAC system

Recommended Users for Furnace Filters on Sale

  • People with severe allergies who need a clean indoor air environment
  • People with newborn babies who need top quality filtration
  • Asthmatics who want to avoid as many triggers as possible
  • Immunocompromised individuals

Furnace Filters on Sale: Conclusion

A quality furnace filter is a good investment so when choosing a furnace filter on sale, it is a good idea to choose one with a high MERV rating. This is especially true if there is anyone in the home who requires the extra filtration provided by the better furnace filters.

Even if no such individuals are present in the home, a high quality furnace filter is essential to maintaining a high indoor air standard. Purchasing a furnace filter on sale is just the first step, it is also necessary to clean and maintain it on a regular basis. This will help to keep the furnace filter operating at peak efficiency for as long as possible.

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