HEATING
If you live anywhere around Antioch, Chain O’ Lakes, Lake Villa, or Fox Lake, your furnace runs almost nonstop from late October through March. That means your air filter is doing a lot of quiet, unglamorous work — and it’s the single most-ignored maintenance item we see when we get called out on no-heat calls. The good news: replacing it is cheap, easy, and it can add years to the life of your system.
The short answer
For most homes in our area, plan to change a standard 1-inch pleated filter every 60 to 90 days. During January and February, when the furnace is running hard around the clock, push that closer to 30 to 45 days. If you have pets, a finished basement that kicks up dust, or someone in the house with allergies or asthma, treat every 30 days as your default.
Why it matters more here than in milder climates
Northern Illinois winters are long and cold. Your furnace can log more runtime in one Lake County January than a furnace in Tennessee sees all year. Every minute it runs, it’s pulling air — and everything floating in that air — through the filter. Once that filter clogs, airflow drops, the heat exchanger runs hotter than it should, and the blower motor has to work harder. That’s how a $15 filter problem turns into a $1,500 repair.
We’ve also noticed that older Antioch homes — especially anything built before the late ’80s — tend to have leaky return ducts that pick up extra dust from crawl spaces, basements, and attics. That means more junk hitting the filter, faster.
What kind of filter should I buy?
Filters are rated by MERV, which stands for Minimum Efficiency Reporting Value. Higher MERV catches smaller particles, but it also restricts airflow more. For most residential furnaces in our area, MERV 8 to MERV 11 is the sweet spot. Anything MERV 13 and above is usually marketed as ‘allergy grade,’ and while it works great in the right system, it can choke a standard furnace if the ductwork wasn’t designed for it.
A safe rule of thumb: if you want better filtration than a basic fiberglass filter gives you, go with a MERV 8 or MERV 11 pleated filter from a name-brand manufacturer. If you really want hospital-grade filtration, ask us about a media cabinet — it’s a 4- or 5-inch thick filter that sits between the return duct and the furnace and only needs to be changed once or twice a year.
How do I know it’s time to change it?
You don’t always need to wait for the calendar. Pull the filter out and hold it up to a light. If you can’t see light through it, it’s done. Other signs: the furnace runs longer than it used to, the house takes forever to come up to temperature, certain rooms feel colder than others, or you’re seeing more dust settle on furniture.
A few local pro tips
- Write the install date on the edge of the filter with a Sharpie. You’ll thank yourself later.
- Buy filters in a 6-pack online or at a local hardware store and keep them stacked near the furnace. If it’s a pain to get to, it won’t get changed.
- Make sure the arrow on the filter frame points toward the furnace — that’s the direction of airflow. A backwards filter collapses under pressure and stops filtering properly.
- If you use a smart thermostat, set a recurring filter reminder. Most of them will ping your phone based on actual runtime hours, which is more accurate than a calendar.
When to call us
If you’ve replaced the filter and your furnace is still short-cycling, blowing cool air, or making noises it didn’t make last winter, that’s not a filter problem anymore. Give High Caliber Home a call and we’ll come take a look before a small issue turns into a cold Saturday night with no heat.