5 Things To Know About Your Furnace Air Filter

One of the most common questions we receive from our customers is, "How often should I replace my furnace filter?" The answer to that question is usually once a month. However, there are a few other things to consider when it's time to replace your furnace air filter.

1. Buy filters in bulk and keep them near your furnace. Having filters ready near your furnace will reduce the tendency to procrastinate and wait too long between filter changes. Also, buying a package of filters is usually less expensive than purchasing individual filters.

2. Always use the correct size filter. An poor-fitting furnace filter will allow dirt and debris to get around the filter and contaminate the air in your home. It can also lead to clogged air conditioner coils, reducing the efficiency of the unit and shortening the lifespan of the compressor and other components.

3. Install the filter facing right direction. Most filters have arrows indicating the direction of air flow. Putting the filter in backwards can cause the filter to work less efficiently and in some cases may cause the filter to buckle, allowing air around the filter.

4. Be safe! Always turn of the power at the breaker rather than the thermostat before changing the filter. This will ensure that if you come in contact with any wiring near the filter enclosure you won't get shocked.

5. Furnace filters are not air cleaners. While most 1" furnace filters will keep much of the dirt and debris out of your air ducts, they are not going to keep the air free of contamination. If your home has excess dust, pet dander, smoke or other contaminants, consider installing a high quality home air filtration system.

These HEPA filters are designed to capture the smaller particles that pass through many 1" furnace air filters. Have questions about your furnace filters or your home's heating and cooling system?

Call ABC Plumbing, Sewer, Heating, Cooling and Electric. We are always here to help answer your questions.

ABC Plumbing Locations

Arlington Heights, IL

220 W Campus Dr
Arlington Heights, IL 60004
Phone: (888) 991-3942

Largo, FL

11701 S Belcher Rd Suite 127
Largo, FL 33773
Phone: (888) 465-9799

Downers Grove, IL

1001 Ogden Ave LL4
Downers Grove, IL 60515
Phone: (888) 412-3566

Tampa, FL

4326 W El Prado Blvd Suite 7
Tampa, FL 33629
Phone: (888) 594-9030

Evanston, IL

828 Davis St UNIT 205
Evanston, IL 60201
Phone: (888) 868-9369

Our Blog

VIEW ALL BLOGS

Leaks Under Your Sink? DIY Plumbing Checks Before Calling the Professionals

Regular plumbing checks are a simple yet effective way for homeowners to prevent costly repairs and protect their home. By routinely inspecting areas like under sinks and outdoor hose connections, you can catch small leaks early and address minor issues before they escalate. Simple actions like tightening fittings, replacing worn washers, and monitoring for moisture can go a long way in maintaining your plumbing system. While DIY checks are helpful, it’s important to know when to call a professional for persistent or more serious problems. Staying proactive with plumbing maintenance helps ensure efficiency, lower water bills, and long-term peace of mind.

Chicagoland HVAC Repair, Installation & Maintenance: Your Year-Round Comfort Guide

Chicagoland’s extreme weather—from freezing Illinois winters to hot, humid summers—puts constant strain on your HVAC system. This guide covers the most common heating and cooling issues homeowners face, including furnace problems in winter and AC performance challenges in summer. You’ll learn essential maintenance tips, warning signs to watch for, and when it’s time to repair or replace your system. Stay comfortable year-round with expert insights on HVAC repair, installation, and maintenance tailored for Midwest homes.
READ MORE
DIY Water Heater Flush: What You Can Do Before Calling a Plumber

Your water heater plays a vital role in your daily comfort—but without proper maintenance, it can lose efficiency or develop costly issues. In this guide, we explain why draining your water heater is important, the warning signs to watch for, and how homeowners can safely perform a basic flush. You’ll also learn common mistakes to avoid and when it’s time to call a professional plumber to ensure your system is running safely and efficiently.
READ MORE
What You Can (and Shouldn’t) Do With Your Electrical Panel

Your home’s electrical panel powers everything from your lights to your essential appliances—but handling it improperly can be dangerous. In this guide, we walk homeowners through how to safely locate and perform basic checks on their electrical panel using simple sight, sound, and smell inspections. You’ll also learn the key warning signs of electrical issues, what tasks you should never attempt on your own, and when it’s time to call a licensed electrician. Stay informed, stay safe, and protect your home with these essential electrical panel tips.
READ MORE