>When you have a Merv filter in your home, it means that your heating system is working harder than normal to keep your home at a comfortable temperature. This means that your filter will need to be changed more often than normal. If you notice that your heating bills are increasing, or if your filter is dirty or discolored, then it’s time to replace it. Fortunately, Merv filters are not difficult to replace. In fact, they are some of the easiest filters to service on the market. Here are some signs that your Merv filter needs to be replaced sooner than expected:

Your Filter is Dirty and/or Discolored

Dirty filters are a common sign that your Merv filter needs to be replaced. Merv filters are often constructed of a mesh material that traps dirt and dust. However, they can become clogged with dust and other debris over time. This can cause your heating system to work harder to keep your home warm. Dirty filters can also discolor the water that flows through them. This discoloration can indicate that your filter is dirty and needs to be replaced.Dirty filters can be difficult to clean. However, you can try using a cleaning solution such as baking soda or vinegar to remove any remaining dirt and debris. If these solutions fail to clean your filter, then it’s time for a new one.

Your Filter is Faded

Another sign that your filter needs to be replaced is if it has faded significantly. Merv filters are constructed of a fabric that fades over time. However, this fade can be accelerated by high amounts of UV exposure. If you live in an area with high levels of UV radiation, then your filter may start to fade much faster than normal. You can protect your filter from UV exposure by covering it with an UV-resistant cover. However, if your filter is faded and you are unable to replace it, then you will need to change your HVAC system’s air flow direction.

Your Filter is Muted

If your filter is muted, then it is likely that it has become clogged with debris. This can be caused by dust, or even hair and other small fibers. If you notice that your filter is muted, then it’s best to replace it immediately. You can also try to clean your filter with a vacuum or brush. If these methods are unsuccessful, then it’s time for a new filter.

Your Filter is Cracking or Shifting

A Merv filter can shift or crack if it becomes too dry. This is often caused by a lack of water in your HVAC system. If your filter is shifting or cracking, then it’s best to replace it as soon as possible. You can also try watering your filter to rehydrate it.

Your Filter is Fading at a Faster Rate than Normal

If your filter is fading at a faster rate than normal, then it may be time for a new one. This is often caused by high levels of UV exposure, or a dirty filter. If you notice that your filter is fading at a faster rate than normal, then it’s best to replace it as soon as possible.


Merv filters are a great addition to any HVAC system. They trap dirt and other debris that can damage your system and make your home feel stuffy. However, they can be difficult to clean and can become clogged with debris over time. If you notice that your filter is dirty, discolored, or fades too quickly, then it’s time for a new one.

Frequently Asked Question

MERV stands for Minimum Efficiency Reporting Values. This determines a filter’s ability to capture particles between .3 and 10 microns. This tells the buyer how far a certain type of filter can screen airborne particulate matter.
Usually, it would depend on the type of setting of a household. If the location is dry or if there are pets inside the house. In general, a MERV rating of 8-10 is already good for residential purposes. This type of filter can capture airborne particles and improve your air quality without compromising your budget for replacement and HVAC performance.
HEPA air filters and MERV-rated filters are different. HEPA filters exceed the ASHRAE test protocol used when determining the MERV ratings. HEPA filters are the only air filters that have been tested and certified in meeting a specific efficiency at a particular size.
They both differ in their particle arresting. MERV 11 furnace filters perform up to 90% particle arresting. The MERV 13 HVAC filters, on the other hand, have a capacity of about 98% which makes them more efficient. The MERV 11 is recommended for residential spaces in the moderately polluted area who owns a pet and has mild allergies.