Keep your home warm, your air clean, and your energy bills low with this step-by-step tutorial from Utah's trusted HVAC experts.
When the temperatures drop in West Jordan or Sandy, your furnace works overtime. It’s the heart of your home during our freezing winters, pumping warm air into every room to keep your family comfortable. But there is one small, inexpensive component that can stop that system in its tracks: a dirty filter.
Handling furnace filter replacement in Utah is one of the easiest and most effective DIY tasks a homeowner can do. Yet, it is often overlooked until the heater stops working or the energy bill spikes. Whether you are dealing with winter inversion pollution or summer dust from construction in Lehi, a clean filter is your first line of defense.
At North Star Heating & Air Conditioning, we have been serving Utah families since 1998. We believe in educating our customers so they can handle the basics—and knowing exactly when to call a pro for the rest.
"Think of your furnace like a runner trying to breathe through a straw. A clean filter is a wide straw; the air moves easily. A dirty, clogged filter is like a coffee stirrer; the system has to work twice as hard."
Neglecting your filter can lead to:
Real results: Clean vs. Dirty Blower Components
The standard advice on the packaging might say "lasts up to 3 months," but Utah conditions often require more frequent changes. Between new construction in Eagle Mountain and our unique inversion seasons, filters load up quickly.
If you use 1-inch fiberglass filters, have multiple pets, or suffer from allergies.
For standard pleated filters in a typical home without pets.
Only for specialized, thick media filters (4–5 inches wide) installed by a pro.
Higher isn't always better. MERV (Minimum Efficiency Reporting Value) measures how effectively a filter traps particles. Choosing the wrong one can choke your system.
Stops lint and dust bunnies. Good airflow, poor air quality.
Stops dust, mites, and mold. Ideal for most Utah residential furnaces.
Stops dander and smog. Caution: Can restrict airflow if ducts aren't sized for it.
If you want hospital-grade air without damaging your furnace, consider Indoor Air Quality Services like purifiers instead of restrictive filters.
Locate the service switch (looks like a light switch) or breaker. This prevents the blower from sucking the filter in.
Usually found where the return air duct meets the main furnace unit.
CRITICAL: The arrow on the filter must point TOWARDS the furnace (blower motor).
Remove old filter, insert new one snugly, and turn power back on.
Visual Guide: Airflow Direction
Living along the Wasatch Front presents unique challenges for HVAC systems. During winter, our inversions trap PM2.5 particulates in the valley. While your furnace circulates indoor air, these outdoor pollutants infiltrate your home, causing filters to clog significantly faster than the national average.
Many of our customers in Salt Lake County and Utah County benefit from pairing regular filter changes with a whole-home humidifier or air scrubber.
Check filters monthly during peak pollution.
Consider a whole-home humidifier.
If you have changed your filter but are still dealing with weak airflow, loud noises, or uneven heating, there is likely a deeper issue. A clean filter cannot fix a failing blower motor or leaking ductwork.
Replacing your furnace filter is the single best thing you can do for your HVAC system’s longevity. If you're unsure about your system's health, our family is here to help yours.
