As a Michigan homeowner, you know our winters are tough on heating systems. One of the simplest ways to keep your HVAC system running efficiently—and to save money on energy bills—is regularly changing your air filter.
In this guide, I’ll walk you through exactly how to do it, how often to do it, and why it matters so much for Michigan homes.
Why Changing Your HVAC Filter Matters
Your air filter traps dust, pollen, pet dander, and other particles before they circulate through your home. Over time, it gets clogged. A dirty filter:
- Restricts airflow, making your system work harder
- Increases energy bills by up to 15%
- Reduces indoor air quality, triggering allergies and asthma
- Can damage your HVAC system if ignored long enough
For Michigan homes, where we run our furnaces heavily from October through April, this is especially important.
How Often Should You Change Your Filter?
The general rule is every 30-90 days, but it depends on several factors:
| Factor | Recommended Frequency |
|---|---|
| Standard 1-3″ filter | Every 60-90 days |
| Pets in the home | Every 30-60 days |
| Allergies or asthma | Every 30 days |
| Heavy system use (winter/summer) | Every 30-60 days |
| New construction | Every 30 days (more dust) |
If you have pets, allergies, or run your system constantly during our Michigan winters, check your filter monthly.
Step-by-Step: How to Change Your HVAC Filter
Step 1: Turn Off Your HVAC System
For safety, turn off your furnace or AC at the thermostat. This prevents debris from circulating while you’re working.
Step 2: Locate Your Filter
Your filter is usually located in one of these places:
- Return air duct (large vent on wall or ceiling)
- Inside the furnace (look for the slot near the blower)
- Behind the air handler (for larger systems)
If you’re unsure, check your HVAC manual or search for your model online.
Step 3: Note the Filter Size
Before removing the old filter, write down the size printed on the frame. It will look something like “20x25x1” (length x width x thickness).
Pro tip: Buy a pack of filters in the correct size so you always have extras on hand. You can find quality filters at any home improvement store or order them online.
Step 4: Remove the Old Filter
Slide out the old filter carefully to avoid spreading dust. Note which direction the airflow arrow points—you’ll need to install the new one the same way.
Step 5: Insert the New Filter
Slide in the new filter with the airflow arrow pointing toward the blower/furnace. If it’s backwards, your system won’t filter properly.
Step 6: Turn Your System Back On
Switch your thermostat back on and run your system for a few minutes to ensure everything is working properly.
What Filter Should You Buy?
For most Michigan homes, a MERV 8-11 filter strikes the right balance between filtration and airflow. Higher MERV ratings trap smaller particles but can restrict airflow in older systems.
Some popular options:
- Basic fiberglass (cheap, less effective)
- Pleated polyester (good balance of price and performance)
- High-efficiency pleated (best for allergies, but more expensive)
You can find HVAC filters on Amazon, at Menards, Home Depot, or Lowe’s. Stocking up on a 6-pack or 12-pack saves trips and often costs less per filter.
The Bottom Line
Changing your HVAC filter is a 5-minute task that pays for itself in lower energy bills, better air quality, and a longer-lasting system. Set a reminder on your phone or mark your calendar—you’ll never forget again.
Need help with your HVAC system?
If your filter is dirty and you’ve noticed your furnace making strange noises or not heating your home properly, it might be time for a professional tune-up.
Request a Free Quote — We’ll help you get your system ready for Michigan winters.
Have questions about HVAC maintenance? Drop them in the comments below!