Dallas Duct Cleaning — Understand When It Needs To Be Done

Monday 25 May 2015 22:58
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If your Dallas home’s air ducts have never been cleaned, you probably don’t even realize the immediate benefits you will get once it’s done. Duct cleaning can have a huge impact on your indoor air quality but because they get dirty over time, you often don’t realize when you need to clean them. While it’s good to have air ducts cleaned every few years, a few tell-tale signs will signal that you should have it done immediately.

Mold GrowthLook inside your air ducts (be sure to turn your air system off first). If you see mold growing on the metal inside, they’re in definite need of a cleaning. Mold spores can detach and start to circulate throughout your house with the aid of your air system. This is a major respiratory irritant and can cause severe health problems.

RodentsIf you have had problems with rodents or insects in your ducts, you need to have them professionally removed. Once you’re sure the problem is taken care of, have your ducts cleaned so that no remnants of them can get in your home’s air.

Excess DirtYour air filters do most of the work when capturing particles from the air but if your ducts are dirty, even they won’t be able to help. If you can actually see dust coming from the supply registers as conditioned air enters your home, you know it’s time for a duct cleaning.

For more information about Dallas duct cleaning and the benefits that come along with improved indoor air quality, contact Crawford Services, Inc.today. We proudly serve North Texas.

Our goal is to help educate our customers about energy and home comfort issues (specific to HVAC systems).  For more information about Dallas duct cleaning and other HVAC topics, download our free Home Comfort Resource guide.

Crawford Services provides heating, air conditioning and plumbing services to all of North Texas. Visit our website to see our special offers and get started today!   
Published in Filters and Ducts

The Telltale Signs Of HVAC Ductwork Problems

Monday 25 May 2015 22:54
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HVAC ductwork problems can go unnoticed for a long time, but the efficiency of an air delivery system directly influences the performance of your air conditioner, furnace or heat pump. You may be losing as much as 30 percent of your conditioned air as a result of faulty or leaky ducts, according to the U.S. Department of Energy.The ductwork in an HVAC system consists of a long, branching group of duct pipes that snake throughout your home, hidden behind walls, in ceilings and floors, or in the attic. Because the majority of the HVAC system is hidden, homeowners often have a hard time determining ductwork’s condition. And over time, connections can loosen or ducts can incur damage.

Most often, ductwork problems require the help of a professional, but here are a few problems you can self-diagnose on your HVAC system.

Uninsulated ducts

When a portion of your HVAC system travels through areas that don’t have access to cooled (or heated) air, like your garage or attic, cool air moving through the ducts will succumb to the hotter attic air surrounding the duct pipes. In the winter, heated air can cool off for the same reason. This is easily fixed by insulating ducts.

Damaged ducts

A variety of factors can lead to damaged ducts, such as connections breaking lose, human interference or poor installation. If conditioned air leaks out of the ducts, you’ll pay for it in terms of higher energy costs. Seriously damaged ducts may require that you replace a portion of the HVAC ductwork system.

An efficient HVAC ductwork system relies on a balanced supply of air sent into your home, along with a healthy amount of return air that moves back into your HVAC equipment. The return-air portion of ductwork is particularly prone to problems such as a lack of adequate return grilles, and the system is prone to leakage too. Proper inspection will identify the root of ductwork problems.

There must be an equal amount of return air to support the supply air ducts. For every ton of air conditioning capacity there must be 400 cubic feet per minute of air volume available in both return air duct and supply air.
Published in Filters and Ducts

How Your Home’s Ductwork Design Affects Energy Efficiency

Monday 25 May 2015 17:11
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crawford_11_22_12No matter how up to date or efficient your home comfort equipment may be, getting the full benefit depends on your ductwork design. Poor design wastes energy, is more costly, negatively impacts your comfort level, and even affects your indoor air quality.

Elements of ductwork design

Homes should have ducting systems that match the design of the home and its heating and cooling equipment. Some aspects of ductwork design are universal to any home. If ducts are compatible with the following, your system's in good shape:

    • Ducts shielded – Ducting should be running in conditioned spaces, spaces within heated and cooled areas. This could be interior walls, ceilings or between floors. If your ducting is mostly in the attic, basement or crawlspace, it must be well insulated. Otherwise, you're losing much of your heating and cooling before it reaches the rooms in your home.

    • Sealed joints – Joints connecting ducting to your equipment, each section or registers must be sealed to prevent air leaks. Air leaks can cause you to lose up to 30 percent of your heating and cooling.

    • Sloping bends – Duct sections that bend should have gradual slopes instead of sharp bends. A turn sharper than 45 degrees slows down airflow and reduces the circulation momentum.
    • Air returns – Air return vents should connect between rooms for the best circulation. Blocked return vents or rooms without air returns cause an imbalance in the circulation of heated and cooled air. The exchange of air in a room is also off balance without a free-flowing exit for air to be recirculated.

If your ductwork design is lacking in any of these areas, it should be checked by a professional technician. Upgraded ducting can greatly enhance your comfort and lower your energy bills. If you have questions regarding your home's ductwork or any other home comfort issues, please contact us at Crawford Services, Inc. We're always ready and happy to help our north Texas neighbors.
Published in Filters and Ducts

Heating Season In Dallas-Fort Worth Is Short, But Get Into The Habit Of Checking Your Furnace Filter

Monday 25 May 2015 17:08
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Even though the heating season in Dallas-Fort Worth is only a few months long, there are still a few wintertime home maintenance jobs you'll want to do to keep up your home's energy efficiency. One of the simplest yet most important jobs is checking your HVAC air filters.

Dirty filters slow down airflow through the HVAC system, reducing thecrawford_12_25_12 system's efficiency and running up your energy bills. Severely clogged filters may blow out of the frame, allowing dust and debris to enter your system and home. Even worse, a dirty filter could cause your equipment to overheat and shut down.

Throughout the heating season in Dallas-Fort Worth, check your filters once a month. To inspect a mechanical filter, such as a fiberglass or pleated paper filter, remove the filter and hold it up to the light. If you can't see light coming through, you'll need to replace the filter.

Because higher efficiency filters can hold more debris, you may find you need to replace these filters less often, though on the other hand, their more elaborate filtering design may impede airflow through your system. An filter's Minimum Efficiency Reporting Value (MERV) indicates its efficiency.

MERV 1 to 4 -- Cheap 1-inch fiberglass filters trap only larger debris particles (those over 10 microns). Although they protect your HVAC system, they do little or nothing to improve your home's air quality.

MERV 5 to 8 -- In this range are the medium-efficiency pleated paper or felt air filters that can remove particles of 3.0 microns or larger.

MERV 9 to 12 -- These higher-efficiency pleated filters can remove particles as small as 1.0 micron in size.

MERV 13 to 16 -- With the highest efficiency of residential air filters, these filters remove particles as small as 0.3 microns. Because these high-efficiency filters may impede airflow, talk with an HVAC professional before installing one.

For more pro tips on keeping your home comfortable and energy efficient during the heating season in Dallas-Fort Worth, contact us at Crawford Services. We provide friendly, reliable HVAC service in North Texas.
Published in Filters and Ducts

How The Forced-Air System In Your Dallas-Fort Worth Home Delivers The Goods

Monday 25 May 2015 17:05
crawford_1_3_13Ducted forced-air HVAC systems are the most widely used type of heating and cooling in the U.S. today. If your home has a furnace, standard heat pump or central air conditioner, then you have a ducted forced-air system. Knowing a little about how your system works will help you detect problems with your furnace or other equipment and make decisions about additional equipment such as air cleaners and humidifiers.Basic forced-air system components include:
  • A thermostat – This signals the system to turn on or off based on room temperature.
  • An air handler – An electric heating or cooling system includes an air handler that contains heat exchanger coils that heat or cool air, a blower to move conditioned air into the ductwork, a filter, and other components.
  • A furnace unit – A fuel-burning furnace that uses natural gas, liquid propane or heating oil contains a combustion chamber (burner) to burn fuel, a heat exchanger to extract heat, a blower to move warm air, and a flue or vent to release combustion gases from your home.
  • Ductwork – The typical forced-air system includes both air delivery ductwork to send heated or cooled air into your rooms and return ductwork to bring conditioned air back to the heater or air conditioner. Vents and registers also help supply and direct airflow.
When your system's thermostat senses the room temperature is below or above the set temperature, it signals the furnace or air handler to turn on. The blower fan draws room air through the return ductwork into the air handler or the furnace's heat exchanger.Next, depending on the type of system, either the furnace's burners or the air handler's electric elements turn on, or the heat pump starts up. When the air has warmed or cooled sufficiently, the blower fan pushes it into the delivery ductwork where it flows out to your rooms.Naturally, there's a bit more to a forced-air system than that, so if you need help understanding yours, contact us at Crawford Services. We provide the Dallas-Fort Worth area with friendly, reliable HVAC care.Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems). Image courtesy of Shutterstock
Published in Filters and Ducts

Duct Cleaning: Will It Benefit The IAQ In Your Dallas Home?

Monday 25 May 2015 17:03
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04_10_13Duct cleaning isn't a cure-all for poor indoor air quality, but in certain cases it can make a perceptible difference. Keeping an eye out for signs of dirty ductwork is especially important in the Dallas area, where our climate encourages dust buildup and mold growth.

You may benefit from duct cleaning if:

  • Your registers are releasing clumps of dust or debris, or blowing visible particles into the air.
  • You can see mold in or around your ducts.
  • You notice signs of rodent or insect infestation, such as mouse droppings or dead insects.
  • You've had construction done recently. Newly built and remodeled homes often have construction debris left over in the ductwork.

If you're dealing with any of these issues, after a professional duct cleaning, you can look forward to:

Fewer air contaminants – When debris blows out of your registers, it becomes airborne and there's a chance you'll breathe some of it in. These debris particles irritate your airways and can worsen allergy and asthma symptoms.

Better smelling air – Over time, duct buildup may produce unpleasant odors that permeate your home. This is especially true with mold and rodent infestations. Get rid of the buildup and you'll probably find your home smells better.

Greater efficiency – Air flows through clean ducts more easily than through ducts blocked with buildup. After duct cleaning, your system will heat and cool more effectively. Because your system won't have to work so hard to do its job, your energy costs will fall, too.

We follow the cleaning procedures outlined by the National Air Duct Cleaners Association (NADCA). As part of your cleaning, we'll:

  • Disassemble, clean and replace all supply registers and return air grilles.
  • Clean the ducts with a Rotobrush machine. This machine gently dislodges stuck-on debris, then immediately vacuums it up.
  • Mist the ducts with an anti-microbial treatment to hold off mold and bacterial growth.

Some dust in the ductwork is normal and doesn't necessarily mean a cleaning is in order. In many cases, duct cleaning would be an unnecessary expenditure.

To help you decide whether or not your ducts need cleaning, Crawford Services offers a free, no-obligation ductwork evaluation. A technician will use a duct camera to assess your ducts, then work with you to choose the best course of action. The technician will also offer suggestions for addressing the cause of any excess buildup.

If you suspect your ducts are dirty or you have other concerns about your indoor air quality, get in touch with us at Crawford Services. We provide value-driven HVAC solutions in Dallas and the surrounding area.

Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock
Published in Filters and Ducts

Understanding Air Filtration Basics for Your Dallas Area Home Begins With MERV

Monday 25 May 2015 16:59
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07_04_13Air filtration is a vital component of indoor air quality. As the air circulates through your HVAC system, it passes through the filter, which captures and holds particulates and contaminants such as dust, mold, pollen, and even micro-organisms and bacteria.

When choosing an air filter to use in your heating or cooling system, you should pay particular attention to the filter's MERV level. MERV stands for Minimum Efficiency Reporting Value, and is an industry-wide rating of filter efficiency. MERV ratings indicate how effective a filter is at trapping airborne particles as small as 0.3 microns in size.

MERV ratings start at 1 and range as high as 16 for residential filters. Higher MERV numbers indicate better air filtration efficiency and the filter's ability to capture smaller particles.

  • MERV 1-4: Air filters in this MERV range are usually low cost, but they are only minimally effective. They are best at collecting particles of 10 microns or larger.
  • MERV 2-8: Medium-quality filters such as these are usually made of a pleated filter material that presents more surfaces where particles can be trapped. They are best against contaminants of 3 microns or larger.
  • MERV 9-12: These are high-quality filters that are very good for general use in air filtration. They can handle particles of 1 micron or larger.
  • MERV 13-16: These filters offer the highest efficiency air filtration for residential systems. They work well at removing smaller particulates of 0.3 to 1 micron. However, when the MERV numbers get this high, the filter may impede airflow, which will reduce system efficiency and performance. High MERV filters also may require system modifications in order to work properly. Consult with your HVAC technician on what air filter will work the best in your particular system.

Crawford Services, Inc. brings years of experience and customer care to the cooling and heating services it offers throughout the Dallas area. Contact us today for more information on the importance of air filtration and how to choose an air filter with the right MERV rating to meet your indoor air quality needs.

Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock
Published in Filters and Ducts

Air Filters Vary in Allergy Effectiveness: Which Type Is Best for Your Dallas Home?

Monday 25 May 2015 16:57
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08_14_13Air filters in your central cooling and heating equipment serve as a barrier to common pollutants such as pollen, pet dander, dust mites and tobacco smoke, which find their way in your home every day. Without proper filtration, these allergens can ruin your indoor air quality, and set your respiratory system into a tailspin.

Aren't all air filters basically the same?

The answer is no. Fortunately, the HVAC industry has a standard rating system in place. All air filters come with a Minimum Efficiency Reporting Value, or MERV rating, that tells consumers how effective they will be at removing particles from the air. For residential purposes, ratings range from 1 to 16. For example, a standard 1-inch fiberglass filter with a rating of MERV 4 will remove less than 20 percent of particles down to 3.0 microns as they pass through your ductwork. This includes pollen, dust mites and carpet fibers. Upgrading to a pleated filter with a rating of MERV 8 will dramatically improve your indoor air quality by removing at least 70 percent of similar particles, in addition to mold spores.

What about HEPA filters?

High-efficiency particulate air (HEPA) filters use an advanced design to trap particles down to .3 microns with 99.9 percent effectiveness. They are primarily used in hospital or clinical settings. HEPA filters can be used in central HVAC systems in residential settings, but usually require professional modifications to existing equipment and ductwork, which can make them costly options for homeowners. Stand-aline HEPA air cleaners are also available for comprehensive air purification in the home.

HEPA-like air filters

Choosing an air filter with a MERV 7-13 can provide virtually the same level of filtration as a HEPA filter without the modifications required to install those types of filters. According to the federal EPA, filters rated above MERV 13 will not provide a significant increase in the reduction of indoor air pollutants but may impede airflow in your system, which is something to be avoided. Changing your air filters on a regular basis will do more to ensure that your indoor air remains clean.

At Crawford Services, we understand the importance of maintaining the air quality in your Dallas area home. Proper installation is the key to getting the most of any air filtration device, so call us today and let us put our experience to work for you.

Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock
Published in Filters and Ducts

Common Obstructions in Your Dallas Area Home’s Air Ducts

Monday 25 May 2015 16:54
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09_19_13Air inside your air ducts isn’t necessarily going where it's supposed to. Neither is all the money you’re spending to cool or heat it. Residential forced-air ductwork is a major source of lost energy, low comfort levels and big utility bills. Most residential air ducts are delivering efficiencies barely above 50 percent. It’s no surprise: When energy was cheap, design and fabrication of home ductwork was frequently treated as an opportunity to skimp on building costs. Today, as these systems silently deteriorate, we’re paying the price for savings of the past.

A trained HVAC technician using calibrated equipment can pressure test the system, measure airflow and visually inspect the entire span of ductwork. Here are some of the common defects in air ducts he’ll be on the lookout for:

Clogged air filter. The most frequent cause of airflow-related problems, the air filter is often the first thing a technician will check when the system’s under-performing.

Dirty blower fan. Dust and dirt accumulation on blower fan blades reduce the fan's efficiency to move air. Since the output of the blower is matched to the size of the ducts, proper output is required to maintain air balance in rooms.

Collapsed flex ducts. Flexible air ducts designed to bend around corners may lose their material integrity over time and sag or even collapse entirely, cutting off all airflow.

Deteriorated insulation. Inside rigid ductwork, insulation lining the surfaces may deteriorate and collapse, interfering with free flow of air.

Supply duct leaks. Because supply ducts operate under positive pressure from the blower, leakage that spills conditioned air out of the ducts is most likely to occur on this side of the system.

Leaky return ducts. Leaks in return ducts can draw unfiltered air into the system from unconditioned zones such as the attic or under the house.

In North Texas, Crawford Services, Inc. is always raising the bar for quality service and customer satisfaction. Contact us for a skilled evaluation of your air ducts and a reliable estimate of what’s needed to restore optimum performance and efficiency.

Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock
Published in Filters and Ducts

Can Home Air Filters Help with Fall Allergies?

Monday 25 May 2015 16:50
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Home air filters will help your Dallas home’s HVAC system to fight fall allergies.  But, not if they are improperly maintained.  Just like any other filter, a home air filter can fill up with the most undesirable dander and substances causing a blockage. To be safe, replacing your home air filter on a monthly basis will ensure that you are best covered against allergens.

filtersThe truth is, no matter how much you wash your hands, bathe, vacuum your carpets our just stay indoors, ragweed, mold spores and dust mites are going to get in. And, if you do not have adequate circulation in your house, then your home air filter cannot do its job.

Home air filters are only effective when the air moves through them. They can remove those nasty fall allergens that wreak havoc on your body, but not without proper circulation. The more circulation your home has, the better job your filters going to do for you. Make sure that air ducts and returns have been placed in sufficient places in your home, with no obstructions, to ensure that all air circulates in and out of them.

Your air ducts are another place that mold can spawn. They are also a haven for rodents and insects, so it is important to have your home air filter in place to filter everything out. In most cases you air ducts are not accessible or visible. So in these situations you may need to consider calling a professional out to inspect and possibly clean the ducts if necessary.

What most people fail to realize is that your in-home air can actually be much more polluted than the air outside. This is due to a number of factors which include tracking mold and ragweed in from outdoors, pet dander (skin flakes, saliva, urine, etc.), insect droppings and other pollen. When inside, these pollutants become trapped. They then bond with your household fabrics such as carpet, bed sheets, pillows and rugs. Once they have bonded with these fabrics, every time they get touched the allergens become airborne and you are their unwilling host. When they become airborne, they can also be sent through the air returns and filtered out by your home air filter.

Home air filter that have the highest MERV ratings are the most effective defense against allergens. MERV stands for Minimum Efficiency Recording Value. The scale is 1 – 20 and the higher the MERV, the better filtration you are going to get. Yet, before you grab the highest MERV rating available, it is important that you first check with your HVAC manufacturer’s recommendations.

The higher the MERV rating, the more particles it can collect, but that also means the HVAC system has to work harder to get the air through it.  This means that you have to weigh efficiency with allergen protection to choose the best home air filter for your individual instance.

For example, you might option for a standard flat panel filter, which has a low MERV rating, but a maximum efficiency.  These work fine, but they are only intended to protect the furnace and not cut down on your fall allergies. Home air filters like these provide up to four MERV’s of protection.  If you have severe fall allergies, you might want to look into something that can protect you from the ragweed a little better.

Pleated home air filters are considered a medium efficiency air filter. They generally protect you with a MERV rating of about 13. But remember, the more MERV’s, the harder your HVAC system has to work to get the air through. This is also the case with high efficiency filters and HEPA filters. Although they are both going to do a great job of protecting you from fall allergies, you will want to consider how efficient your system is going to be when it comes to paying the electric bill.

air-duct-cleaningIt is of imperative importance that you change your home air filter frequently, regardless of your MERV rating.  If your house has a lot of dust, maybe from construction, sanding or outside dust getting in, your filters are going to clog quickly. You do not want your HVAC system to become more costly than it has to be. If you are using a medium efficiency filter, it might be a good idea to change it monthly.

If you do find mold growth near your returns, make sure to get them cleaned out as soon as possible. If you are considering upgrading your HVAC system, you might option to get a unit that does not continually use indoor air. Using filtered outdoor air could be a good way to handle any circulation issues you may be having. Sending the old air out and the new filtered air in is a great way help eliminate indoor allergens.

But still, a system that uses outdoor air needs to have an adequate home air filter. It is the season for ragweed and as we all know, this causes hay fever. A medium efficiency filter will do, but then you fall back into making sure that it is continuously changed out. Most people who have suffered from allergies have seen a drastic difference in their symptoms when they simply changed out their home air filter monthly, instead of every three months.

And, the benefits will be seen way beyond your health.  Many homeowners who up the frequency of their home air filter changes also notice a difference in their electricity bill.  A clogged filter forces your HVAC unit to work excessively hard to get the air through. Just like with any forced air system, obstructions diminish the flow of air. Changing out your home air filter means better health and saving money. That’s just a win-win situation.

The simple truth is, there are a lot of ways that you can get sick or put your health at risk. The last way you want this to happen is through airborne fall allergens. A home air filter fights allergens for you constantly and can help keep you healthy and active for a very long time.
Published in Filters and Ducts

Air Duct Repair with Crawford Services

Monday 25 May 2015 16:45
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Air duct repair is often an oversight in many Dallas homes. But, if you are experiencing high electric bills, extra dirty air filters or moldy spots, you absolutely need it. If your ducts have come apart, or have been damaged, then your HVAC system is not able to deliver the conditioned air that you paid to produce.  In short, you not only lose out on comfort, but you can also get dirty wall debris hung up in the return supply, potentially forcing clogs in your air filter.

Ducts that are damaged or have come apart can lead to a whole host of problems that can wreak havoc on even the most experienced homeowner. Some signs of these problems are rooms that are too hot or too cold, sweating ducts and grills or just extra high electric bills. In many cases, air duct repair work is a comforting thought, giving you the ability to know that all issues have been eliminated and any other problems, like mold or mildew, have been removed.


After repairs are handled, it is best to also consider having your air ducts cleaned out. The fact is, all kinds of dust, debris, animal droppings and mold can gather in them and circulate throughout your Dallas home.   Crawford Services specialists are able to run an agitator through ducts and removed any of the unhealthy debris without further contaminating the air in your living spaces.  The agitator will sprawl throughout the ducts and cause the debris to become airborne. The airborne debris are then vacuumed out and discarded.

It really is advisable to use a professional for air duct repair. It is a sizeable job that requires professional equipment and knowledge to accomplish the task correctly. With Crawford Services, your evaluation is free and includes a firm written proposal. And, as with all of our services, all work is performed by highly trained professionals, allowing you the opportunity to look forward to healthy, sanitized air.
Published in Filters and Ducts

Air Filters and the Particles They Trap: Here’s What They Do for Your IAQ

Monday 25 May 2015 16:43
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10_17_13Choosing air filters for your Dallas home is about more than just the price. While air filters with a higher Minimum Efficiency Reporting Value (MERV) rating are more expensive than basic types, the cost is often worth it to enjoy better indoor air quality (IAQ). However, choosing an excessively efficient air filter can be a bad decision as well due to blocked airflow.

Here’s a look at different types of air filters, what they trap and which applications they are designed for.

• MERV 1-4: Filters at the lowest end of the efficiency spectrum come standard in HVAC systems. They capture the largest particles down to 10 microns, which includes dust mites, carpet fibers and pet dander that could damage the equipment. They provide very little improvement for IAQ.

• MERV 5-8: Mid-range filters are appropriate for most residential applications. They trap particles down to 3 microns, such as mold spores, hair spray, pudding mix and dusting aids. They provide reasonable improvements to IAQ at an affordable price.

• MERV 9-12: These higher-efficiency filters are only necessary if you have severe allergies or other respiratory problems. They trap particles down to 1 micron, including milled flour, auto emissions, humidifier dust and Legionella bacteria.

• MERV 13-16: The highest-efficiency air filters on the MERV scale trap particles down to 0.3 microns, such as tobacco smoke, all types of bacteria and germs found in a sneeze. Because they have a tendency to block airflow considerably, filters with this high rating are not appropriate for residential applications. They are reserved for use in hospitals, smoking lounges and commercial buildings with superior IAQ.

• MERV 17-20: These are considered High Efficiency Particular Air (HEPA) filters, capable of trapping more than 99 percent of particles less than 0.3 microns, including viruses, carbon dust and combustion smoke. These are certainly not designed for HVAC systems, but they can be found in vacuum cleaners and portable air cleaners.

To summarize, the best air filters for home use are between MERV 5 and 12, depending on your IAQ needs. To learn more, please contact Crawford Services today.

Our goal is to help educate our customers in North Texas about energy and home comfort issues (specific to HVAC systems).

Image courtesy of Shutterstock
Published in Filters and Ducts