How often do you really need to change your AC filter?

Author: Brain Swaniawski MD  |  Last update: Monday, February 17, 2025

How Often Do I Need to Change Out My Air Filter? Generally, most air filter manufacturers and HVAC companies recommend changing your air filter every 90 days, or 3 months. That can change based on where your home is located (ex. dusty, dry climates), if you have any pets, and the age of your system and equipment.

What happens if you don't change your air conditioner filter?

If you don't change your air filter, it can quickly become clogged with dust and debris, preventing proper air filtration. This leads to a variety of issues for your HVAC system including system inefficiency, higher energy bills, inadequate air quality, and ultimately failure.

Do you really need to change air filters every 3 months?

Changing your filters every 3 months is the way to maintain proper airflow, efficient operation, and great indoor air quality throughout your home.

How long does an AC filter last?

You should replace these regularly, around every 30 days. Newer systems often use pleated filters, also rectangular with a depth of about one inch. You should replace these about every 90 days if you have no allergies, but AC pros typically recommend every 45 days for max efficiency.

How do I know if my AC filter needs replacing?

6 Telltale Signs It's Time to Replace Your AC Filter
  1. Accumulation of Dust Around the Air Vents. When an air filter clogs, it releases dust and dirt into the system. ...
  2. Strange Odor. ...
  3. Sudden Hike in Electricity Bills. ...
  4. Overheating AC Unit. ...
  5. Allergies. ...
  6. Malfunctioning AC.

How Often Should You Replace Your HVAC Filters? | How to replace AC filters

What happens if you haven't changed your AC filter in a year?

Air filters that are overdue for a change are a common cause of HVAC system failure. Over time, dirt builds up in the heating and AC filters, causing components such as the motor to go into overdrive, which may eventually overheat your unit.

Will my AC be OK without a filter?

You might wonder about the risks of running your AC without a filter, even temporarily. The simple answer is: not for long. Ideally, your AC should never operate without a filter for more than 6-8 hours. Going beyond this can negatively affect both your system's health and your home's air quality.

Will my AC work better if I change filter?

A new, clean new air filter keeps your HVAC unit running smoother and running longer, extending its useful life.

Can a dirty filter cause AC to stop?

Home » FAQs » Can a Dirty Air Filter Cause My AC to Stop Working? A dirty air filter can be to blame if your central air conditioning unit hasn't been working the way it should lately. A host of problems can occur with this filth and, in the most extreme case, the complete breakdown of your AC.

What happens if you wait too long to change the air filter?

If you don't change your AC filter, it will begin to fail. It will no longer be able to filter the air properly, letting dust and contaminants get into the HVAC system. Dust jams the moving parts of an AC such as fan motors and valves. Airflow is restricted which creates a strain on the system.

Do expensive air filters last longer?

Expensive air filters are made from higher-quality materials, like fiberglass, that can last for up to 12 months. This not only saves you money, but it's also more convenient since you won't have to remember to replace your air filters as often.

What happens if you dont get your air filter replaced?

As previously discussed above, failing to change your filter means debris and dirt will soon clog your unit, causing it to overwork. This in turn raises your energy bills. It takes longer to cool your home. With an old air filter running, you'll notice that it takes so much time for your AC to cool you home.

Can I clean my AC filter instead of replacing it?

Many disposable air conditioner filters should be replaced rather than cleaned, as cleaning with water can lead to possible mold issues. Clean the coils and fan of the AC regularly, using a canister of condensed air to blow away dust and buildup.

What is the best air filter?

The 17 Best Air Purifiers of 2024
  • The Best Overall. IQ Air Atem X. Read more. $1,400 at Amazon.
  • Best Air Purifier for Small Rooms. Coway Airmega 200M. Read more. $230 $160 at Amazon.
  • Best for Large Rooms With High Ceilings. Coway Airmega ProX. Read more. ...
  • A Budget Large-Room Option. Bosch Air 6000 Air Purifier. Read more.

How important is it to change AC filter?

Keep your family healthy with clean air by changing your air filters regularly. Not only do clean air filters improve your home's air quality, but they also increase energy efficiency. Clogged and dirty air filters require your HVAC system to work harder to push air through your system.

How long can you go without changing AC filter?

Most manufacturers recommend changing basic fiberglass filters every 30 days. Higher-quality pleated filters should generally be changed every 90 days, though they can potentially last up to six months.

Can I replace car AC filter myself?

With a few tools, some simple instructions, and an extra 15 minutes, you can replace your air filter all by yourself and get back on the road.

What happens if AC filter is not changed?

Dirty air filters can restrict airflow and put tremendous stress on the air conditioner. The additional, unnecessary stress leaves your AC unit more prone to malfunctions and can even cause it to break down on excessively hot days.

Will a new filter make my AC colder?

So, while a new cabin air filter might not make your AC 'colder,' it certainly contributes to a cooler and more comfortable cabin experience. Here are the key highlights: Improving your AC's performance is not always about making the air 'colder. '

How much difference does a new air filter make?

Does a High Performance Air Filter Make a Difference? Yes, high-performance air filters make a significant difference in your vehicle's performance by increasing torque and horsepower. One test concluded a high-performance air filter increased horsepower by 2.6% and torque by 3.7%.

Does changing the AC filter lower bill?

By ensuring that your filters are clean and replaced regularly, you can significantly reduce energy consumption. ENERGY STAR® even points out that such proactive maintenance can lower an air conditioner's energy use by 5% to 15%.

Is it OK to not have an AC filter?

No, you should never run your AC without a filter!

The purpose of your air filter is to clean your home's air and to keep your AC system dust- and dirt-free, which is why it's important to only run your AC with a filter installed.

Why is AC not blowing cold air?

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

Can I run my AC without a filter for one day?

The short answer: You can get away with running your AC without a filter for a short period of time. However, doing so for longer than 6-8 hours can hurt your system and decrease your home's indoor air quality.

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