Ever find yourself in a home improvement store facing rows of HVAC filters and confused by all the options?
Are you tempted to splurge on some of the fancy, thick, pleated filters that cost a pretty penny and make all sorts of health-related promises?
It can be overwhelming when trying to make the best decision for your HVAC system and your indoor comfort.
In this helpful video, Matthew Holtkamp will tell you exactly which filters to buy and which ones to avoid.
Members of our Comfort Club enjoy fresh filters at every visit.
If you’d like to get the twice annual maintenance your system needs, along with great discounts and VIP scheduling, please call (770) 271-7511 to explore the benefits of Comfort Club membership.
What Does an HVAC Air Filter Do?
Your HVAC filter plays an important role in maintaining indoor air quality and protecting your heating and cooling equipment.Â
As air circulates through your system, the filter captures airborne particles such as dust, pollen, and other contaminants.
A clean, properly selected filter can help keep your HVAC system operating efficiently. However, the filter needs to be replaced regularly because a clogged filter can restrict airflow and place additional strain on the system.
Types of HVAC Filters
Different types of filters offer different levels of filtration and airflow resistance. Understanding the differences can help you make a more informed choice.
Fiberglass HVAC Filters
Fiberglass filters are typically inexpensive and designed primarily to capture larger airborne particles. They may be suitable for basic filtration needs but generally provide less filtration than higher-efficiency options.
Pleated HVAC Filters
Pleated filters have a larger surface area than basic flat-panel filters, allowing them to capture more airborne particles. They are available in a range of filtration ratings and are commonly used in residential HVAC systems.
Electrostatic Filters
Electrostatic filters use an electrically charged material to attract and capture certain airborne particles. Some are disposable, while others are designed to be washed and reused.
High-Efficiency HVAC Filters
Higher-efficiency filters can capture smaller particles than basic filters. However, they may also create greater airflow resistance, so it’s important to choose a filter that is compatible with your specific HVAC system.
What Is a MERV Rating?
MERV stands for Minimum Efficiency Reporting Values. The MERV rating indicates how effectively an air filter captures certain sizes of airborne particles.
A higher MERV rating generally means the filter can capture smaller particles more effectively. However, that doesn’t mean the highest available MERV rating is automatically the best choice for every residential HVAC system.
Your HVAC equipment is designed to operate with a certain amount of airflow. Installing a filter that is too restrictive for your system can reduce airflow and potentially affect system performance.
Before choosing a high-MERV filter, check your HVAC manufacturer’s recommendations or consult an HVAC professional.
What MERV Rating Should You Use?
The appropriate MERV rating depends on your HVAC system, equipment specifications, household needs, and indoor air quality goals.
Instead of automatically choosing the highest-rated filter available, homeowners should consider the balance between filtration and airflow.
If you’re unsure which MERV rating is appropriate, an HVAC professional can inspect your system and recommend a suitable option.
How to Choose the Right HVAC Filter
When buying a replacement filter, consider these factors:
Check the Correct Filter Size
The filter must be the correct size for your HVAC system. Check the dimensions printed on your existing filter or consult your equipment documentation before purchasing a replacement.
Consider Your Indoor Air Quality Needs
Homes with pets, allergy concerns, or higher levels of airborne particles may benefit from a more effective filtration solution. However, the filter should still be compatible with your HVAC system.
Check the Recommended MERV Rating
Your HVAC manufacturer may recommend a specific filtration range. Follow the equipment manufacturer’s guidance before selecting a higher-efficiency filter.
Consider Filter Replacement Frequency
Even a high-quality filter needs to be replaced when it becomes dirty. The appropriate replacement schedule depends on factors such as filter type, household conditions, pets, occupancy, and HVAC usage.
Is a More Expensive HVAC Filter Always Better?
Not necessarily. A more expensive filter may offer better filtration, but that doesn’t automatically make it the right option for every HVAC system.
The most important factors are whether the filter is compatible with your equipment, provides appropriate filtration, and allows sufficient airflow. Choosing a filter based solely on price or the highest filtration rating may not produce the best results.
How Often Should You Change Your HVAC Filter?
The ideal replacement schedule varies depending on the filter type and your home’s conditions. Homes with pets, multiple occupants, construction dust, or frequent HVAC use may require more frequent filter changes.
Rather than relying only on a calendar schedule, check the filter regularly. If it appears visibly dirty or clogged, it may be time for a replacement.
Common HVAC Filter Buying Mistakes
Choosing the Wrong Filter Size
A filter that doesn’t fit correctly may allow air to bypass the filtration media or prevent the system from operating properly.
Selecting the Highest MERV Rating Without Checking Compatibility
A high MERV rating isn’t automatically better if your HVAC system isn’t designed to handle the additional airflow resistance.
Ignoring the Filter After Installation
Installing a new filter is only the first step. Filters should be checked regularly and replaced as needed.
Buying Based Only on Price
The cheapest filter may not provide the filtration your home needs, while the most expensive option may be unnecessary for your system. Focus on compatibility and your home’s specific requirements.
When Should You Ask an HVAC Professional?
If you’re unsure which filter size or MERV rating is appropriate for your HVAC system, an HVAC professional can help. They can evaluate your equipment, review airflow requirements, and recommend filtration options that balance indoor air quality with system performance.
Professional guidance can be particularly useful if you’re considering switching to a significantly higher-efficiency filter or if you’ve noticed reduced airflow after installing a new filter.
FAQs
Does a higher MERV rating mean a better HVAC filter?
Not always. A higher MERV rating generally indicates greater filtration efficiency, but the filter must also be compatible with your HVAC system. A filter that is too restrictive may affect airflow and system performance.
What is the most common HVAC filter size?
There isn’t one universal HVAC filter size. Residential systems use many different dimensions, so you should check the size printed on your current filter or consult your HVAC equipment documentation.
Can the wrong HVAC filter damage my system?
A filter that is incorrectly sized or excessively restrictive can contribute to airflow problems and may place additional strain on an HVAC system. Always choose a filter that fits properly and is appropriate for your equipment.
Are washable HVAC filters better than disposable filters?
Washable and disposable filters both have advantages, depending on your HVAC system and indoor air quality needs. Washable filters can be reused but require regular cleaning and proper drying. Disposable filters are easier to replace and come in various MERV ratings. Always check your HVAC manufacturer’s recommendations before choosing between the two.
Should I buy a thick HVAC filter?
A thicker HVAC filter isn’t necessarily better for every system. The right filter depends on its size, MERV rating, airflow resistance, and compatibility with your HVAC equipment. A filter that is too thick or restrictive can reduce airflow and affect system performance. Check your manufacturer’s recommendations before choosing a thicker filter.
