Choosing Between Furnace HVAC Air Filters 15x20x1 and 20x25x4 for Better Home Filtration
These 15x20x1 and 20x25x4 furnace HVAC filters vary in size, airflow, efficiency, and also price. The thinner 15x20x1 filter is often thinner and creates less resistance to airflow, while the thicker 20x25x4 filter can offer better filtration but restrict airflow. Filtration efficiency varies and is often rated by MERV; this rating is higher in thicker filters. Maintenance-wise, the 15x20x1 is going to need to be replaced more often than the longer-lasting 20x25x4. Lastly, although bigger filters tend to cost more at purchase, their longevity and increased efficiency usually make up for the difference in cost. Learn more about how to make the wisest filter choice.
Key Takeaways
The thin 15x20x1 offers less resistance to airflow compared to the thicker 20x25x4.
The 20x25x4 is usually thicker, which means that it has a larger filtration capacity.
The MERV rating of the filter is likely to be higher in the 20x25x4, which means higher particle capture efficiency.
While the filter may need to be replaced more frequently monthly to 3 months with the 15x20x1, the 20x25x4 may last for 3 to 6 months.
Although the 20x25x4 filter is a bit more expensive, increased lifespan and effectiveness can pay off in the future concerning air maintenance.
Filter Size and Fit
Dimensions and fit are the basic factors of dimensional orientation when it comes to HVAC air filters. Any poor fit will get you into trouble. Gaps may be an indication that unfiltered air bypasses the filter, which may affect its efficacy.
You will often also see sizes following one another like 15x20x1 and 20x25x4, with you being shown the height, width, and depth respectively. Every measurement matters. A 15x20x1 filter will not fit into a slot designed for a 20x25x4 filter. Always check the size your system requires when buying a filter.
Installation is as crucial. You are expected to install the filter with the arrow of airflow pointing toward the furnace or air handler. Otherwise, in most cases, this may compromise on quality and efficiency of the air.
Filters also vary in thickness. This thickness may determine just how much dirt and debris a filter can catch. Generally, the more massive the thickness of the filter is, the higher the surface area of the filter. This, therefore, means that it has a larger filtration capacity.
Differences in Airflow Resistance
Fit and size are essential factors that dictate airflow resistance in your HVAC air filter. Thus, a comparison between a 15x20x1 filter and a 20x25x4 filter would show a stark contrast as far as how each impacts the airflow in your system.
Generally speaking, the smaller the size with being thinner, the less resistance is encountered while using the furnace HVAC air filters 15x20x1; therefore air moves through it more freely, and your furnace performs better.
Conversely, the 20x25x4 filter offers a greater surface area for filtration but is rather more resistance-friendly. The thicker design can choke airflow, assuming your system does not have a means of supporting it.
This 20x25x4 filter may cause your furnace to work extra hard to pump air through the system, which may also result in higher energy consumption and wear and tear on your HVAC system.
Filter Efficiency Ratings
Rating of filtration efficiency is the most important and first step when selecting an HVAC air filter for your system: ratings refer to a filter's ability to capture airborne particles, like dust, pollen, and pet dander. Most use the MERV, or Minimum Efficiency Reporting Value from 1 to 16. The higher the rating, the better the filtering performance, although the higher the air resistance, too.
A 15x20x1 and a 20x25x4 filter will have different MERV ratings. The more significant the MERV rating of 8 or higher, the bigger the particles and allergens that could be captured from inside your house, hence making your indoor air quality better.
Having said that, should you want to use a 13 or above-rated filter, you get finer filtration and are best suited for households with allergy sufferers or pets.
Note that high filtration efficiency often means low airflow unless your system is designed for the same. You have to strike a balance between filtration efficiency and your HVAC system's airflow requirements. The ratings enable you to make good decisions about improving indoor air quality without killing the operating capacity in your HVAC system.
Replacement Frequency
Most homeowners fail to realize the importance of regularly maintaining and timely replacement of HVAC air filters. Maintenance checks and fresh filter replacements tend to keep your home's air clean and improve the working of your HVAC system very significantly. The maintenance schedule varies depending on the type of filter used or the environment in which the household is located.
Filters of standard sizes, such as 15x20x1, need to be replaced every 1 to 3 months. On the other hand, the larger 20x25x4 filters could last for 3 to 6 months before it is due for replacement.
Some other tips
Replace filters every month: Although you'll be exchanging the filter only three times a year, you should inspect your filters every month, so you catch the problem before large-scale problems begin brewing in your home.
Consider your environment: If you have pets or live in a very dusty environment, you may need to change it more often.
Use your phone and calendar to remind you when the time is to check or change your filter.
Cost and Value
As you buy air filters for your HVAC, you want to think about the cost of the value of those air filters. Most notably, the 15x20x1 and 20x25x4 filters can vary dramatically in price. The 20x25x4 filters tend to be a little more expensive, but they do work more efficiently and presumably last longer; it will cost a little bit more, but once again, the filters capture much more dust, allergens, etc., which means higher quality air and may end up saving you money on heating bills.
At the same time, 15x20x1 filters are cheaper and may be available at any store but may have to be changed more often. If you compare those costs in the long run, you will see that the first cost saving of saving money on the cheaper filters will not gain a thing compared to investing in better products.
Lastly, take into account your requirements, the square footage of your house, and your budget. A higher quality air filter will improve the level of air quality; besides that, it will save you money, as it requires lower maintenance, and makes it well worth that cost for your home's HVAC.
Frequently Asked Questions
Can I use a 15x20x1 Filter in a 20x25x4 Slot?
The 15x20x1 filter will not fit in a 20x25x4 slot. There is a size mismatch, which causes air leaks and reduces the efficiency of the filter. Only choose the right size for maximum effectiveness.
What are the most common materials used in most of these air filters?
Most air filters contain materials such as fiberglass, pleated fabric, or foam. These seem to capture dust and pollen of other things floating through the air and clean the air in your home. You will want to make a decision about which one is best to use based on the usage of your HVAC system.
When Do I Replace My Air Filter?
You will know it is time to replace your air filter when you can see visible dirt or dust accumulation, when airflow decreases, and when allergies increase. These are just a few reasons to check every one to three months for optimal performance.
Do these filters suppress allergens within the home?
Yes, these filters can help lower allergens dramatically inside your home. This aspect traps dust, pollen, and dander of pets to make the air cleaner. Regular replacements help you maintain a healthier environment for yourself and your family.
Are There Eco-Friendly Options for These Filter Sizes?
Yes, both sizes have an eco-friendly choice too. You get filters, whether recycled or sustainably produced. These are eco-friendly choices that would help to contribute to a clean environment without compromising on the quality of air that is being produced.
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