The Best Furnace Filter for Winter Comfort: Cleaner Air, Stronger Airflow
Your heat is on, and you can feel the air flowing through your vents. Instead of a toasty warmth, your home is struggling to heat up, and dust appears to be everywhere.
In this situation, many people will reach for the highest-rated air filter without thinking about their airflow. To balance clean air and good airflow, you need an air filter that suits your comfort goals and system.
Why Filters Matter More During Heating Season
Because your system works overtime during the winter, your filters get dirty faster than normal. If the filter is clogged or excessively restrictive, it can make your heat feel weak and uneven. Instead, it’s important to get a filter that offers a balance of comfort and healthy air without straining your furnace.
Quick Basics: What an HVAC Filter Actually Does (And What It Does Not)
Your heating, ventilation, and air conditioning (HVAC) filter is designed to trap particles, such as pet dander, lint, and dust. Depending on the filter’s rating, it can even trap smoke, allergens, and fine particles.
However, filters won’t remove every odor from your home or resolve all of your airflow issues. They also won’t remedy humidity problems. Instead, filters are essentially one piece of the larger picture.
The Main Tradeoff: Air Quality vs. Airflow
When picking an air filter, there is a key tradeoff between airflow and filtration. A higher filtration level will catch smaller particles, but it will also create added resistance if the system isn’t made to handle it. For the best results, you need a balance that your HVAC system is able to efficiently handle.
Understanding MERV Without the Headache
What MERV Means: The minimum efficiency reporting value (MERV) represents how well a filter can capture particles. A higher MERV means it can filter out smaller particles.
A Practical Way To Think About It
- Lower MERV: A low MERV will offer better airflow in exchange for basic dust control.
- Medium MERV: This type of rating is a good balance between airflow and dust control.
- High MERV: While a high MERV can capture the finest particles, it may also restrict airflow. This is more likely to be a problem in older systems.
Fast Guidance
A general rule of thumb is to start with a mid-range MERV as long as the filter fits and is changed on time. If you try to jump to a high MERV and the airflow suddenly drops, it can negatively impact your comfort.
Start Here: 3 Questions That Pick the Right Filter Faster
- Does anyone in your home suffer from allergies, asthma, or smoke sensitivity?
- Do you have pets or heavy dust?
- Does your home have whistling at the return registers, weak airflow, or rooms that warm up slowly?
Filter Thickness Matters More Than Most People Realize
The MERV rating isn’t the only factor to consider. Filter thickness also has a major impact. A 1-inch filter is a common, affordable option, but it can load up quickly. If it is too tight, it can result in restricted airflow.
Some HVAC systems are able to handle thicker filters. These offer more surface area, which is better for longevity. Over time, these filters are often better for airflow.
However, you can’t use a filter that is the wrong thickness for your system. Always check your system specifications before you install a new filter.
Common Filter Types and When They Make Sense
When you shop for filters, you’ll generally be able to find the following types at most stores.
Fiberglass: Flat and Cheap
Fiberglass filters are incredibly affordable and offer low resistance. However, they offer the least air cleaning.
Pleated Filters: The Most Common “Upgrade”
With pleated filters, you can enjoy better particle capture for a good value. However, this upgrade can restrict airflow if you get a MERV rating that is too high for your system.
High-Performance Allergy Filters
A high-performance allergy filter offers the best fine-particle capture. Depending on the setup and how frequently you change it, this can lead to potential airflow problems.
A Simple “Pick Your Filter” Guide Based on Household Needs
Each household is different, so consider the following factors as you pick a filter.
If Comfort and Airflow Are the Priority
A balanced filter won’t restrict airflow. For best results, make sure to change it regularly throughout the winter.
If Allergies Are the Priority
For allergy sufferers, better filtration is essential. However, you don’t want it to be too restrictive because this can impact airflow. Additionally, make sure to replace it regularly and get the right fit.
If Pets Are the Priority
A pleated filter is great for pets, but you need to replace it consistently. To reduce dander and pet hair, it’s a good idea to brush pets regularly and clean the return vents.
If You Worry About Smoke and Fine Particles
High MERV ratings are effective for fine particles, but your system has to have the capacity to handle the higher level. Otherwise, it can strain your furnace and result in more frequent repairs. In some cases, the best option may be to invest in whole-home filtration add-ons instead of raising the MERV rating and pushing your HVAC system too much.
How To Choose the Correct Size and Avoid Air Bypass
To get the right air filter, remember the following important tips.
- Check your old filter size.
- Make sure the filter fits in the slot. An overly small one can leave gaps that let dirty air through.
- If your filter rattles, bows, or doesn’t sit quite right, it won’t be able to do its job well.
Warning Signs Your Filter Is Starving Airflow
If you experience any of the following signs, your filter may be starving the airflow to your system.
- You noticed weak airflow from your vents right after a filter change.
- Your furnace runs longer, but your comfort level doesn’t improve.
- There are whistling sounds coming from your return grille or filter slot.
- Rooms that are far from the furnace feel colder than the rest.
- The filter gets dirty unusually fast, such as within two to four weeks.
Replacement Timing for Winter: Don’t Wait for It To Look Dirty
During the heating season, you typically need to change your filter more often than you do during the spring or fall. To stay on top of filter changes, check it monthly. Then, replace it based on dust buildup and your comfort. If your home has pets, heavy heating usage, or remodeling dust, you should replace it more frequently.
Small Habits That Help Your Filter Work Better
You can help your filters do their job by vacuuming high-dust areas and around the returns. Make sure the return grilles are not blocked by curtains, rugs, or furniture.
To ensure proper airflow and no pressurization issues, all of the supply vents should be kept open. Additionally, keep the doors to each room open.
When To Call a Pro Instead of Fighting With Filters
If your filter seems to be causing airflow issues or the heat level is uneven, you should schedule professional repairs. Similarly, unusual noises, short cycling, and overheating are signs to call an HVAC expert. An experienced technician can help with airflow balancing, duct sealing, and other whole-filtration systems that can help you clean the air without limiting your airflow.
The “Best” Filter Is the One Your System Can Breathe Through
To protect your HVAC system, it’s essential to select the right air filter and replace it consistently. Whether you want help choosing a filter or an air quality upgrade, Fox Family Heating & Air can help. Learn more by scheduling a quick HVAC check today.
FAQs
Is a higher MERV always better?
Not always. While a higher MERV is better at filtering the air, it depends on your goals. For example, MERV 11 is generally fine for allergies. If you have an older heat pump or furnace, higher MERV ratings can also strain the system. Because of this, you should always check to see what the highest MERV rating you are allowed to use on your HVAC system is.
How often should I change my filter in winter?
Each manufacturer has different specifications. Generally, you should change your filter every 30 to 90 days. However, it should be replaced more frequently during periods of peak use.
What if my filter size is hard to find?
Many companies, such as big box retailers, sell filters online and will ship them to your house. Some units also use filters that are cleaned instead of replaced, so you don’t have to constantly search for new filters.
Can a dirty filter damage my furnace?
Absolutely. Filters are there to protect your furnace. If it is dirty, the debris can get inside your HVAC equipment and cause it to overheat. Over time, it will strain your blower motor and lead to more frequent repairs.
