How often should you replace your furnace filter? Household Guide

Replacing your heater filter routinely guarantees that the air in your home will stay clear of residue and pollutants. On the off chance that you do not change your channel, it will top off. And it will no longer have the capacity to trap new contaminants. A full filter can no longer keep extra pollutants from coursing through your home. Thus, it makes you and your family inhale more residue and allergens consistently. Moreover, a full heater filter causes the engine on your system to work more forcefully. As a result, it will make your heating system less efficient. That is why changing your furnace filter is essential.

How often should you replace your furnace filter?


There is no single response to that question. However, you will still have the answer you need. Each home runs their heating system in various time and duration. And each home, have a different environment – different pollutants present. For that, below are the few rules to help you know the replacement frequency. These are the things that affect to what extent a filter endures.

1-2 inches filters = every 3 months

4 inches filters = every 6 months

5 inches filters = every year

How to know that you need to replace your furnace?

  • The filter is obviously grimy. Surely in the event that you can’t see the material of the filter itself, you must replace it.
  • The system is running more much of the time than normal.
  • You home is more dusty than usual.
  • There are weird scents, like burning scents close to your unit.

Replace Filter: Factors that affect Frequency


Open doors and windows welcome dust, debris, and dirt from the outside to enter your home. And it puts an additional layer of foulness on your furnace filters. If your windows and entryways are regularly left open, you should change filters more frequently. The frequency becomes:

1-2 inches filters = every month

4 inches filters = every 2 months

5 inches filters = every 3 months


Most home have their lovely pets inside. They are part of the family. So in case that you have fuzzy pets living in your home, this will abbreviate the life of your heater channel. The more pets you have, the shorter the life of your filter will be. Thus, it requires more frequent filter replacement.

If you have one pet at home, you have to change your filter at this frequency:

1-2 inches filters = every 2 months

4 inches filters = every 4 months

5 inches filters = every 6 months

If you have many pets at home, you have to change your filter at this frequency:

1-2 inches filters = every month

4 inches filters = every 2 months

5 inches filters = every 3 months


Having smokers at home can also diminish the life of your filter. The more smokers you have at home, the more frequent you should change your filter.

If you have one smoker at home, you have to change your filter at this frequency:

1-2 inches filters = every 2 months

4 inches filters = every 4 months

5 inches filters = every 6 months

If you have many smokers at home, you have to change your filter at this frequency:

1-2 inches filters = every month

4 inches filters = every 2 months

5 inches filters = every 3 months


The duration of time that your heater fan is on the run, impacts the frequency of your filter replacement schedule. Here are the guides for your filter:

Constantly ON = every month

Sometimes ON = every 2 months

Never ON = every 3 months


The abundance of clouds of dust in your home is another factor that can abbreviate the life of your heater filter. Is your house one of those that has a lot of dust? In that case, here’s the schedule you must have:

1-2 inches filters = every month

4 inches filters = every 2 months

5 inches filters = every 3 months


In the event that anybody in your home has hypersensitivities or allergies, it’s better if your change filter more often.

Being aware of the elements that impact the air quality inside your house is wise. It is a decent estimation for how frequently you should replace your furnace filters. Keeping new filters in your heater will help guarantee that your heater runs easily and proficiently. And above all, the air you and your family inhales is as pure as ever.

Replace you Filter each 1-3 months

Even so, our master proposal is to change the filter every 1-3 months. You can have filter stock ups from your local hardware or from certain professionals that avail the product. However, you should act. The services will not approach you themselves, you will be the one that should take the first step for improvement. Or if you don’t like the option of buying a new filter each month, a reusable filter might be good for you. Simply ensure you adhere to producer’s directions for cleaning and replacing!

Why is there a need to replace your Filter?

Many warming and cooling contractual workers will disclose to you that it’s critical to change your heater channel each month. You may feel that it isn’t that significant and is simply an addition to your pile of tasks. What you have to know, notwithstanding, is the reason why it is so significant to do that. And also, how it will save you cash for a long duration of time.


Dust, pet dander, dirt, and debris are the factors that can affect your filter. These pollutants will serve as clogs blocking airflows in the unit. Thus, the furnace will forcefully work harder dues to poor air cycle. At the point when this occurs, you should make often repairs to replace the destroyed parts. Additionally, the helpful existence of your heater will be cut short.

As your furnace works harder, this implies it is utilizing more power to work. Thus, it brings bigger bills. By changing its filter month to month, you will help lessen your home’s warming expenses.


The EPA estimates that the air we inhale inside our homes can be up to multiple times dirtier than the air we inhale outside. The motivation behind having a filter in your heater is to diminish that dirt in the air.  It collects a certain measure of clouds of dust and different allergens that can circle all through your home.

No matter how immaculate your home will be, these pollutants will always be there. So if you don’t change your filter regularly, these contaminations will continue to grow. And it will increase the foul air quality inside your home.

Accordingly, your family’s wellbeing may suffer. Particularly those individuals who experience the ill effects of asthma or sensitivities, they are the one who’ll suffer more. If ever your family is getting more colds than expected or are always experiencing a clog, something’s wrong with your filter.

Replace Filter: Things you must know about Filter

A filter is a vital piece of a heater. It smoothly carries out its responsibility with no fuss. And then, it enables the remainder of the heater to carry out its responsibility. It is anything but complicated.

Indeed, your furnace filter is important. However, it is the HVAC component that we mostly neglect. We tend to forget this segment of our furnace. They may appear as though they are simply enormous cardboard boxes with loads of strands or pleated materials. But our air filters really influence a few vital zones of home comfort and our furnaces’ performance. Therefore, there are things you have to be aware of to effectively carry out its responsibility.

What’s the Purpose of Furnace Filter?

Its main responsibility is to secure your heater, most especially, the blower fan. It protects it from all the pollutants that the return duct takes in. Thus, it ensures your breathing wellbeing.

An air filter generally comes from a spun fiberglass material, pleated paper, or fabric encased in a cardboard edge. Its essential purpose is to clean the air that flows through your warming and cooling systems. They trap and hold numerous sorts of pollutants and contaminants that could influence your wellbeing and solace. These include dust and dirt, pollen, molds, and its spores, fibers, and lint, metal, mortar or wood particles. There are also hair and animal dander, as well as bacteria and microorganisms.

Filtration, for the most part, happens when the air that we exhale once again enters into the HVAC gear. In there, the system will condition the air and distribute it once again. In the process, the air goes through the air filter. It will filter and clean the air from specks of dust and other pollutants.

How does a Furnace Filter Work?

Your filter pushes air through your home, pipes, and heater. The cool air is drawn through the return pipes to the furnace. And there, it warms the air through the warmth exchanger. The warm air then goes through the pipes out through the vents into your home’s rooms. After that, hotter air in your rooms drives the cool air back through the return pipes. And the procedure starts once more. With this air cycling procedure, pollutants come with it. That is where the furnace filter comes to the picture. It filters the air that goes in and out of your furnace. And it keeps the pollutants from getting to the system and spread into your rooms.

The Types of Furnace Filters

There are several types of furnace filters, and you have to choose the one and best fits your home.



This type is regularly the most famous kind of filter. Yet, it only blocks the biggest particles from going through your heater. This sort certainly doesn’t help in quality air. And if you have allergies, this is not the perfect filter for you. This type of filter is the cheapest and replaceable monthly.



This type is from polyester or cotton paper. It proves to be environmentally-friendly and could trap smaller particles like mites. This type is affordable and replaceable monthly.



This type comes from self-charging electrostatic paper or cotton strands that are fit for catching possibly destructive little particles. It self-charges as air goes through them. This type of filter is perfect if have pets or smokers in the home. It is not very expensive depending on the size.


This type of filter comes from advance self-charging electrostatic strands. It does self-charging that helps block little particles. Thus, it is best if you have pets or smokers. Moreover, this type of filter is washable. You just have to remove and clean it, before reusing. It could last for eight to ten years if you properly maintain it.

An electrostatic permanent filter can be costly. But since it is permanent, you don’t have to buy another one for replacement every month. Thus, it is a one-time purchase.


This one comes from a 4″ to 5″ pleated and synthetic cotton that traps the smallest of particles. It has a metal grid that could help in stopping leaks.

This filter is perfect for you in the event that you have immunity or respiratory issues. In fact, emergency clinics ordinarily utilize this kind of filter. It proves to be expensive and could not fit all type of furnace.

The Sizes of Furnace Filters

Size alludes to the particles you are attempting to trap in the filter, not simply the real size of the filter. Often times, we take a gander at the MERV rating scale to assess which channel is progressively powerful for our home. But, we have to think about that a higher rating does not really mean it is the best decision for you. The higher the MERV rating, the lower is the airflow. It could make your warming and cooling framework work harder and conceivably wasteful. Besides, diminishing airflow can really exacerbate your air quality!

Similarly, as there are various sorts of channels, there are various sizes also. The size is basically dependent on your heater. In the event that you’ve seen the measurements on your furnace’s case, you can see its thickness, height, and length. The common thickness measurement is 1″ and the second in line is the 4″. Regular, sizes go from 14″ x 25″ to 25″ x 25″. Check your manual to know the size of filters that could fit your furnace. Or if you want, you can just check on the measurements on your unit’s case.

Well, it is tied in with finding the correct balance. A filter rating between MERV 8 and 13 can be lovely to deal with.

The MERV Ratings

The Minimum Efficiency Rating Value or the MERV has something to do with your furnace filters. It rates your filter’s denseness. Mostly, filter qualities go from 1 to 16, with the higher number speaking to the thickest and densest filters. Not all air filters will clean your indoor air with a similar degree of efficiency. Higher-quality filters, while costing more, will most likely expel more contaminants from your indoor air.

In most cases, the MERV rating shows the efficiency and performance of a filter. Standard MERV qualities extend from 1 to 16. The number filling in is the pointer of how well the filter will expel pollutants from the air. Higher MERV numbers show better filtration. But, having a higher MERV rating filter can also host some issues. While it is capable of trapping more pollutants, it may be so thick that hinders the airflow. That is why it is ideal to check with an HVAC professional. They can decide the proper MERV rating that you should use with your heater.

  • MERV 1-4: These are regular standard filters that give a basic degree of filtration at a low price.
  • MERV 6-8: These channels give great filtration and are effective in private settings. They are frequently made of pleated material or paper to give more surfaces to trapping particles.
  • MERV 9-12: These are the mid-level filters. Filters like these are of moderately high caliber and can trap exceptionally little particles of 1 micron or bigger.
  • MERV 13-16: These high-effectiveness filters are the best standard filters that are accessible. They can trap exceptionally little particles of 0.3 microns or bigger.

Filters and filtration system are likewise accessible with MERV evaluations higher than 16. These sorts of channels are extremely successful. But at the same time, they’re thick and thick and can meddle with wind stream inside your home’s HVAC hardware. High-MERV filters can lessen your warming and cooling adequacy and could harm your HVAC framework by limiting wind current. Ensure your warming or cooling hardware can deal with the higher-MERV filters before purchasing one.

Separate air filtration and decontamination units are likewise alongside your HVAC framework. These air cleaners likewise give unrivaled air cleaning utilizing top-notch filters. Check with your local reliable HVAC specialist to check whether an air refinement system is perfect for you.

Replace Filter: The Maintenance

The majority of the air that warms or cools your home will inevitably go through the air filter. Hence, you must keep clean filters in your warming or cooling unit.

  • Grimy air filters with clogs can damage your furnace system. In the more outrageous cases, dirty filters can make your system malfunction that later leads to its early retirement.
  • Grimy air filters can decrease the airflow in your cooling and heating system.  It can cause your air-handling fans to forcefully work harder and get weary at an early age.
  • Grimy air filters fail to successfully trap pollutants. It could let these contaminations to spread again inside your house.
  • Grimy air filters can attract contaminants. Thus, these certain contaminants can accumulate in the ductwork of your system.
  • Grimy air filters can cause your warming and cooling system to work forcefully even harder. Thus, it increases your monthly electric power bills as it uses more energy.

That is why you must check your air filters regularly each month. Then, change or clean them every time they get dirty. A visual investigation should demonstrate to you whether the filters are filthy or have blockages. Hold the filters up to a light source. Then, in the event that you can’t see the light through the channel, you need to change or clean it

How is a Furnace without Filter?

Normally, as most people’s mindset, a furnace filter equates to one thing. And that one thing is the Air Quality. Filters shield dust from blowing around the home. All the more critically to numerous individuals, it traps allergens like dust and pet dander. And it may even stop the flow of certain germs that could make you sick.

However, not all persons are having allergies. Not all people suffer from asthma or different conditions that would require astounding indoor air quality. In case you are one of these fortunate sorts of people, you probably will not stress a lot over your filter. You will not since you are not experiencing the ill effects of hypersensitivities. Indeed, there are lots of people with such a mindset. They would prefer not to change their furnace filter regularly.

So why should you abstain from running the heater with a dirty filter?

As your heater sucks in the air using the blower fan, it enters through the filter. And the filter is the one to trap dust, dirt, debris, and other pollutants in the air. In time, your filter will have blockages as these contaminants pile up into a layer. It then keeps the air from entering your system. And it can cause various issues:

  • Cold temperature
  • Poor Airflow
  • Higher Bills
  • Your system will wear out
  •  Your heater will overheat

From this, it might appear that you need to remove the filter when it gets excessively filthy. And hold some time up before spending the cash to replace it. That is the thing that leads a few people to ponder whether they could take out the filter all at once.

In rundown, there are two critical reasons you can’t or ought not to run your heating and cooling system without filter:

Your heater’s health

With no filter set up, your heater could malfunction all of a sudden. It is essentially in light of some pollutants that blocks or clogs the blower fan.  Something else, the moderate accumulation of pollutants may prompt its initial destruction.

You and your family’s health

Possibly, you do not worry about your home’s air quality. But even so, remember that allergies can develop. And there are numerous contaminants in home-like cleaners and germs that basically are not safe to inhale. Thus, at least do it for the sake of health and your family.

Replace Filter: How much does a Filter cost?


Cost: $10 – $110

Disposable filters are more affordable and the common type. They come in different ratings and sizes. Thus, it means that you can without much of a stretch get what you need quickly.


Cost: $20 – $90

Just as what its name goes, these filters are washable. It needs a particular upkeep to do its responsibility properly. And also, these filters come in different ratings and sizes. And it needs regular replacements.


 Cost: $40 – $60

These filters prove to be washable and disposable. It does self-charging. Meaning, it works without anyone else charging the air as it goes through. An electric charge will draw them into the filter itself and traps more contaminants. This is particularly incredible for family units with pets or smokers.


Cost: $20 – $120

Hepa filters are the solid filters. You may have one on your vacuum. These are for individuals with sensitivities or exceptional needs with regards to indoor air quality. Be that as it may, they might be unreasonably thick for your heater’s abilities, and could limit wind stream.

The Final Thoughts

As what other people believe, you may think that the filter is fundamentally set up for your wellbeing. However, that is not the real case. The major purpose of the air filter is to shield contaminants from harming the heater itself. The approaching pollutants in the air could destroy the entire system. It could block the jam motor and fan, and destroy it permanently.

This absence of information is the thing that makes people believes that they can run a heater without a filter. Yet, this will accomplish more damage than anything else. And you must always remember that the safety of the inhabitants – your family, are paramount. It should always come first than anything. That is why it is important to follow the rules and guidelines. Follow what is the proper instructions. It will not do you any harm, not following does.

Your furnace and its filter ought to be perfect to keep up your indoor air quality and air dissemination. Anything higher is typically found in social insurance settings like clinics. On the off chance that you have sensitivities and health issues, you may need something somewhat more solid filter. That is why there are various choices for you to make. But even so, every last one of these has its very own qualities, shortcomings, and cost with regards to the quality of the air you need. Counsel a confirmed warming and cooling authority for assistance ensuring that your hardware can deal with it.




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