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4 Common Reasons Your HVAC Filters Are Getting Dirty So Fast

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If you have ever wondered: “Why do my air filters get dirty so fast?” you’re not alone. Many homeowners have asked this question.

Where does all of the dust and dirt come from? And more importantly, what can you do to stop it?

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a dirty hvac filter
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10 hours ago
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Princess C.
19 hours ago
Update 4/6/26: Zach Sperling is such a pleasant and knowledgeable technician that I recommend him highly. Thomas Heating has been a wonderful company to work with in my maintenance plan. If you are looking for a reputable company, look no more.

This company is so responsive that I love them. They respond immediately, and I trust them to tell me what needs to be done. I haven’t been steered wrong yet. They are genuinely nice to work with and honest. I use their maintenance program which I highly recommend.
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5 days ago
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1 week ago
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1 week ago
work good but got at least 6 messages from them
very annoying
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2 weeks ago
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2 weeks ago
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2 weeks ago
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2 weeks ago
Giovanni was very professional, helpful, patient and helped me figure out the issue, if it was covered under warranty, and next steps. Great overall experience and much appreciated.
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Joe G.
3 weeks ago
Always professional and thorough whenever they service our home. We have used Thomas Hoffmann Air Conditioning & Heating multiple times since we moved into our home and will continue to use them in the future.
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Daniel D.
3 weeks ago
Met Nick at ACCA - conference for HVAC contractors. He’s an expert! 100%
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4 weeks ago
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1 month ago
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1 month ago
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Veronica V.
2 months ago
We have a tankless water heater that needed cleaning and a new part, they came out very quickly and got the hot water back again. Thank you!
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jay70001
2 months ago
0 stars if I could. Bought a faulty (not to mention overpriced) surface igniter, called back five minutes later after installing, of course they didn’t stand behind their part. Go to Grainger instead. Same (working) part, half the price.
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2 months ago
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2 months ago
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2 months ago
My furnace was not working. A very nice gentleman came out this morning and fixed the problem and now I have much needed heat. He was very professional and courteous. I will definitely be using them again when the need arises.
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2 months ago
Ryan was very professional, knowledgeable, and thorough. I was able to get an appointment the same day during a biter, snowy day.
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Melinda D.
2 months ago
I will always call Hoffmans for my air and heat needs. They were out to my daughters house that day and fixed it. It was right before the weekend storm with below zero temps the next day. They saved my daughter and grandbabies. I could never thank them more.
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Scott S.
2 months ago
Snow and drifting snow covered intake and out take vents causing the furnace emergency to shut off furnace. Cleaned off the driftibg/ snow off roof and vents furnace works perfect now. Thank you and great job Nick.
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2 months ago
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2 months ago
5 stars! Nick was here to fix my heater within 2 hours of my call. He explained the problem to me thoroughly and got the job done quickly & professionally. Thank you so much!
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3 months ago
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3 months ago
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3 months ago
installed humidifier and hepa filter. Very pleased with service.
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Abby C.
3 months ago
I noticed a strange noise that I was concerned was linked to my furnace. I called Thomas Hoffman Heating & Cooling and Nick came right out. He was very thorough checking all components. Thankfully all checked out for us this visit. Definitely recommend Thomas Hoffman Heating & Cooling!
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DA O.
3 months ago
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3 months ago
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Breanna H.
3 months ago
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3 months ago
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Irene A.
3 months ago
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j. R.
3 months ago
Got a quote over the phone. Everything was explained thoroughly. Dakota, my technician arrived and on time, was very professional and knowledgeable. He didn’t try to upsell or change anything. He did a great job. We can already tell the difference since the ducts and vents were cleaned. Would recommend an use Hoffman again in the future.
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Craig M.
3 months ago
The technician, Ryan, was knowledgeable and helpful in identifying the issue with our mini split AC unit. They are the second company we called after issues with the first and will be using Hoffmann again.
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Jim S.
3 months ago
woke up to a very cold house, called Thomas Hoffmann, they were able to come out a couple of hours later and get the issue resolved. Always trust them, they have always been quick to respond and get either the heating or ac issue fixed that day. Also a great price!!!! give them 10 stars if i could, Thank You JS
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Hank K.
3 months ago
Fast, friendly, professional service.
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sampaul R.
4 months ago
The technician Giovanni was excellent and on time very professional and efficient and knowledgeable of the project at hand ,gave great advice but most of all did great work 👏 thank you .
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Possible Causes

There are many reasons why your air conditioner filters are getting dirty quickly. Here are the top four culprits. 

  1. Cheap filters: Cheap filters tend to have shorter lifespans than high-quality filters. Take, for instance, the standard fiberglass air filters. These types of air filters are generally designed to last for 30 days. Therefore, if you notice that your air filters are gathering dirt fast, it may be due to the inexpensive and low-quality air filters you’re buying.
  1. High temperatures: When the outside temperatures become extreme, your air filter might begin to experience dirt problems. This is because, during extremely hot weather, more air is pushed through the AC system by the blower motor. As a result, the filters will capture more dirt and clog faster. 
  1. Contaminants in the Air: High levels of dust and debris put a strain on your unit, making your filters clog faster. An increase in the number of people in your home can also increase the amount of dirt being kicked up into your system.
  1. Leaking air ducts: The air ducts are responsible for carrying heated or cooled air around your home. If there are duct leaks, this will make your unit work harder and get dirtier faster.
  1. Mold: In some cases, moisture can transfer to the air conditioner, leading to growth and accumulation of mold on the air filters. Aside from slowing your system, mold can also cause health issues. 

Problems Caused by Dirty Filters

When your air filter becomes dirty, you may experience the following problems:

  • Overheating: When the AC filters are dirty, they may eventually cause your air conditioning system to overheat. This is because the system has to work harder to keep up. 
  • Inadequate heating/cooling: If your AC filters become clogged, reaching the desired indoor temperature levels can be difficult. Less air blowing through the system due to dirt and debris can, in turn, lead to uncomfortable warm temperatures in your home. 
  • Unclean air: If your conditioner is not working properly, the air inside your house will become stagnant, and this can cause poor indoor air quality. Poor indoor air quality has been linked to respiratory issues such as asthma and lung disease.

How to Choose the Best Air Filters for Your Home

Air filters are one of the most important components of your HVAC system. Your unit’s performance is directly influenced by what air filters you choose and how well you maintain them.

Here is a breakdown of the main types of air filters for your home and how to choose the right one for you. 

Types of Filters

Certain features and properties set apart different types of filters. To browse for air filters efficiently, you have to decide what kind of product your unit needs. Here’s what to keep in mind.

  • The Size of the Filters – Make sure to accurately measure or check the size of the old filters on your HVAC system. Only go with what the manufacturer recommends, as filters that are incorrectly sized will not perform properly. Atypical openings will need air filters in special sizes and shapes, as trying to adjust a standard one yourself can render it inefficient. 
  • The Materials Used – The variety of materials and styles you can find can make your choice difficult, especially if you don’t know what to look for. You might need a thicker and denser filter if you live in a house where more air is circulated. Most air filters are made out of fiberglass, as it’s one of the more affordable options. Eco-friendly materials are also available, especially for reusable filters that one can wash for maintenance.
  • The Style – Two of the most commonly found styles of air filters are: pleated and honeycomb. Pleated filters have a bigger surface area to process the air, allowing the filter to catch more particles and circulate the air easier. In addition to the pleated style, these filters often have an electrostatic charge, which traps the particles and makes them stick to the filter. The honeycomb structure is mostly seen in more affordable filters. The honeycomb cells are made with paper fibers, fiberglass, or textile fibers, filtering the dirty air through the flutes.

The above characteristics are the very basics of air filters for your home. Here is more information that you can check when looking for air filters for your home.

The MERV Rating

The MERV rating system (an acronym for the minimum efficiency reporting value) is a 1 to 16 scale that shows how effective an air filter is in filtering out particles.

MPR (Microparticle Performance Rating)

MPR rates the filter’s ability to keep out nanoparticles from the air (particles with a circumference smaller than 1 micron. For people suffering from dust, mites, pollen allergies, a system with a high MPR can drastically change the quality of their life.

Call Thomas Hoffmann Air Conditioning & Heating

Whether your air filters are getting dirty too quickly, your system needs maintenance, or you are in need of any other HVAC service, our experienced HVAC technicians can help! Give us a call today!

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At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves on being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and maintain your business or home’s HVAC system.

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