Which Air Filter do I need?

Struggling to find what air filter you need? With the wide array of choices, selecting the right filter for your HVAC unit can be overwhelming. But don’t worry; through this post, we’ll help you pick the best one for your system. 

Choosing the right filter is so important that it can help you save money in the long run. For example, studies show that a clogged or inefficient air filter can spike your monthly energy bills by up to 40%. This means that you can spend around $200 on your electric bills just because of poor filtration. Instead of paying the additional $80 and putting added strain on your system, a simple solution is to select the right air filter, at a cost of $10-15.

Key Takeaways

• Air filters are important because they help improve indoor air quality.
• When selecting filters for your unit, make sure to check its size. Having an ill-fitting filter can reduce its efficiency and effectivity.
• Look at available air filter types; HEPA filters trap most airborne particles, whereas activated carbon filters handle odor neutralization. 
• Despite high-efficiency filters capturing more particles, frequent replacement is necessary which makes filter lifespan and maintenance capabilities crucial. 
• Cleaning and replacement should be done every 90 days for optimal air quality and filter performance.

Understanding Air Filter Basics

For starters, the main purpose of using air filters is to enhance indoor air quality by capturing harmful particles that impact your well-being. These filters act as a crucial barrier against these airborne contaminants.

One important aspect to consider when learning about air filters is filter efficiency. This affects its capability to trap particles of certain sizes. For example, it captures small particles if its score is higher. Nevertheless, keep in mind that a highly efficient one tends to clog faster and might need more regular replacements.

Air filters contribute significantly to maintaining residents' health and well-being by purifying indoor air. Knowing their role and efficiency assists in making an informed choice regarding the most suitable air filter for different situations. Acquiring this knowledge paves the way toward a healthier, cleaner living space.

Air Filter Size Matters

Ill-fitting air or furnace filters can allow pollutants into your home, reduce the effectiveness of your system and increase electric bills. Debris entering the vents around a filter can also damage an HVAC system, resulting in system failure that could cost hundreds in repair bills.

Air filters can be easily ordered by the number printed on an existing product, or you can measure the actual size of the opening where the filter is installed to determine the nominal filter size you need. If the nominal size you need isn't readily available at your local hardware store or online, you will need to order a custom size to ensure a proper fit.

It's important to never force fit a filter that is too big, or allow air flow around a filter that is too small, as either can result in reduced efficiency.

How to Measure Your Filter

1. Remove your current filter
2. Measure length, width, and depth (in inches)
3. Look for the size printed on the filter frame

Which Material Should You Use?

Air filters come in various materials, each tailored to meet different air quality needs and home environments. Choosing the right filter material ensures better air quality, protects your HVAC system, and supports a healthier living space. Here’s an updated breakdown of the most commonly used air filter materials:

• Fiberglass Filters: Affordable and widely available, fiberglass filters are made from spun glass fibers and are effective at capturing larger particles (e.g., dust and lint). However, they are less efficient at trapping smaller contaminants and are better suited for minimal filtration needs.
• Pleated Cotton or Polyester Filters: These filters, made from folded layers of cotton or synthetic polyester, offer enhanced filtration due to their larger surface area. They are a reliable choice for residential homes, balancing affordability and improved efficiency in capturing smaller particles.
• Activated Carbon Filters: Infused with porous carbon, these filters excel at removing odors, fumes, and volatile organic compounds (VOCs) from the air. They are particularly suitable for households with strong odors or chemical pollutants, such as those near industrial areas or with smokers.
• Electrostatic Filters: Constructed from self-charging fibers, these filters use static electricity to attract and trap airborne particles, including allergens, pet dander, and smoke. Available in both disposable and washable varieties, they are an excellent choice for households with pets or allergy concerns.
• Washable or Reusable Filters: Made from durable materials, washable filters can be cleaned and reused multiple times, making them an eco-friendly and cost-effective option. However, they require regular maintenance and may not capture fine particles as effectively as higher-efficiency alternatives.
• High-Efficiency Filters (HEPA): HEPA filters are composed of densely packed fibers and can capture over 99.97% of airborne particles as small as 0.3 microns. While often used in medical facilities and laboratories, they are also ideal for homes where air purity is a top priority, particularly for individuals with severe allergies or respiratory conditions. Ensure compatibility with your HVAC system before installation, as these filters require higher air pressure.

By understanding the strengths of each material, you can select the filter that best meets your household's needs. For superior filtration and balanced efficiency, pleated electrostatic filters remain a top choice. 

What Are MERV Ratings?

MERV ratings measure the efficiency and effectiveness of air filters at capturing particles in the air. MERV ratings range from 1 to 16, with 16 providing the highest filtration. FilterBuy offers products with MERV ratings of MERV 8 (Silver), MERV 11 (Gold) and MERV 13 (Platinum), which are appropriate for most homes and higher than most original equipment manufacturer (OEM) products.

OEM or Aftermarket Air Filter?

An OEM furnace filter is made by the company that also made your HVAC unit, while aftermarket air filters are manufactured by specialized third-party companies. Generally, both sources offer the right size air filter for your system, while after market manufacturers, such as FilterBuy, add extra features like odor blocking, higher MERV ratings and easier-to-replace designs. Top-quality after market filters manufactured by FilterBuy are also generally more affordable and they last longer.

How Much Does Brand Matter?

Different brands will offer different ranges of MERV ratings and filter sizes. More importantly, not all filters are built equal – the quality of the filter materials determines how long the product lasts and how consistent it is in performance. Finally, you want to buy from companies that maximize benefits for customers through fast shipping and strong customer service.

Frequently Asked Questions

How often should I change my air filter?

Replace your home air filter every 90 days in standard environments. If you have pets, change filters every 60 days to remove pet dander and hair. Households with allergy or asthma sufferers should replace filters every 30-45 days for optimal air quality. During summer and winter when your HVAC system runs constantly, inspect your filter monthly for excessive dirt buildup.

What happens if I don't change my air filter?

Neglecting filter changes leads to increased energy bills (up to 15% higher), reduced air quality, system strain, and potential HVAC damage. You might notice more dust, higher utility bills, and reduced heating/cooling efficiency.

How do I know what air filter I need?

Select your air filter based on key factors: household size (400-3000 sq ft), number of occupants, presence of pets, allergy sufferers, and local air quality. For standard homes, choose MERV 8-11. Homes with pets or allergies need MERV 11-13. Check your HVAC manual for maximum supported MERV rating.

Is MERV 11 too high for residential?

MERV 11 is suitable for most residential HVAC systems manufactured after 2000. It captures 85% of airborne particles (1-3 microns) including pet dander, pollen, and mold spores. While it may increase energy usage by 5-10%, the improved air quality often justifies the cost for homes with pets or allergy sufferers.

What MERV should I use in my home?

Choose MERV 8-11 for optimal home filtration. MERV 8 captures 70% of airborne particles and suits basic needs. MERV 11 traps 85% of particles and works best for homes with pets or mild allergies. For severe allergies or respiratory conditions, use MERV 13 if your system supports it.

Is MERV 8 good enough?

MERV 8 filters capture 70% of airborne particles (3-10 microns), including dust, pollen, mold spores, and pet dander. This efficiency level suits most residential needs while maintaining optimal airflow and energy efficiency. Upgrade to MERV 11 for enhanced filtration of smaller particles.

Does it matter which air filter I buy?

Air filter choice significantly impacts indoor air quality and HVAC performance. Different filters capture varying particle sizes: MERV 8 catches 70% of 3-10 micron particles, while MERV 13 traps 98% of particles down to 0.3 microns. Choose based on your HVAC specifications and filtration needs.

What is better, MERV8 or 11?

MERV 11 provides 15% better filtration than MERV 8, capturing particles down to 1 micron versus 3 microns. However, MERV 8 offers better airflow and 5-10% lower energy costs. Choose MERV 11 for enhanced air quality, MERV 8 for optimal energy efficiency.

How often should I change my MERV 11 filter?

Replace MERV 11 filters every 60-90 days. Homes with pets need changes every 45-60 days. Check monthly during peak seasons (summer/winter). A clogged MERV 11 filter can reduce HVAC efficiency by up to 15% and increase energy costs.

How do I choose the right filter?

Follow these steps: 1) Check HVAC manual for maximum MERV rating, 2) Measure filter size (length x width x depth), 3) Assess household needs (pets, allergies, etc.), 4) Consider local air quality, 5) Balance filtration needs with energy efficiency. Most homes do well with MERV 8-11 ratings.

How do I know what size filter I need?

Measure your current filter's dimensions (length x width x depth) or check the size printed on the frame. Common sizes include 16x20x1", 20x20x1", and 20x25x1". Always use exact measurements—a too-small filter creates air gaps, while a too-large filter won't fit properly.

Does MERV 8 restrict airflow?

MERV 8 filters typically reduce airflow by 2-5%, which is negligible for most HVAC systems. This minimal restriction maintains system efficiency while capturing 70% of common airborne particles. Higher MERV ratings (11+) can restrict airflow by 10-15%.

Are high MERV filters worth it?

High MERV filters (11-13) justify their 20-30% higher cost when you need enhanced air filtration. They capture up to 98% of airborne particles versus 70% for standard filters. Consider upgrade costs ($15-25 per filter) against potential health benefits and energy impact (5-15% increased usage).

How do I find my AC filter?

Locate your AC filter in one of three common spots: 1) Behind the return air grille on walls/ceilings, 2) Inside the air handler unit (usually in attic/basement), or 3) In a dedicated filter housing near the air handler. Look for a removable panel or grille measuring 16-25 inches.