Changing your furnace filter might seem like a small maintenance task, but it plays a huge role in the overall performance, efficiency, and longevity of your HVAC system. At Rick Menard Heating & Cooling, we often get asked: How often should I change my furnace filter? The answer depends on several factors including your home environment, the type and size of your filter, and your HVAC usage. Let’s break it down so you know exactly when and why to replace your furnace filter.
Why Changing Your Furnace Filter Matters
The main job of a furnace filter is to protect your furnace’s internal components from dust, dirt, and airborne particles. It also contributes to better indoor air quality, which is especially important for homes with pets, allergy sufferers, or anyone with respiratory issues. A clogged or dirty filter can restrict airflow, forcing your furnace to work harder than it should. This can lead to:
- Reduced system efficiency
- Higher energy bills
- Uneven heating or cooling
- Premature system failure
General Guidelines: When to Replace Furnace Filters
There is no one-size-fits-all answer, but here are some general timelines based on filter type:
- 1-inch filters (e.g., 16x25x1): Every 1 to 3 months
- 4-inch filters (e.g., 16x25x4, 20x25x4): Every 3 to 6 months
- 5-inch filters (e.g., 20x25x5): Every 6 to 12 months
Thicker filters last longer, but the lifespan is still influenced by household factors such as pets, allergies, and frequency of furnace us
What Impacts How Often You Should Change Your Furnace Filter?
Several variables affect how frequently you need furnace filter replacement:
1. Pets in the Home
Pet dander and fur can clog filters quicker. With one pet, consider changing your filter every 2 months. More than one pet? Monthly is best.
2. Allergies or Asthma
If anyone in your home has allergies or asthma, opt for a high-efficiency filter and change it every 1-2 months.
3. Home Size and HVAC Usage
Larger homes may circulate more air and need more frequent filter changes. The same goes for households that use heating or cooling daily.
4. Indoor Air Quality
If you live in an area with high pollution or wildfire smoke, you may need to change your filter more often.
Understanding MERV Ratings
The Minimum Efficiency Reporting Value (MERV) tells you how effective a filter is at trapping particles.
- MERV 1-4: Basic filtration (dust, pollen)
- MERV 5-8: Better for residential use
- MERV 9-12: Excellent for homes with allergies
- MERV 13-16: Hospital-grade filtration (note: may restrict airflow in some residential systems)
Higher MERV = better filtration, but always consult your HVAC technician to ensure your system can handle the resistance of a higher MERV filter.
Which Way Does the Furnace Filter Go?
A common question! Most furnace filters have an arrow printed on the side. This arrow should point towards the furnace and away from the return duct. Installing the filter backwards reduces efficiency and could damage your system.
Can You Reuse or Wash Furnace Filters?
Most residential filters are disposable and should not be reused. However, washable filters do exist:
- Rinse gently with water
- Let it fully dry before reinstalling
- Wash every 1 to 3 months, depending on use
Be aware that washable filters usually have a lower MERV rating and may not provide the same level of filtration as disposable options.
Furnace Filter Costs in Canada
Prices vary based on size, type, and MERV rating:
- Standard 1-inch filters (e.g., 16x25x1): $10 to $25
- High-efficiency 4-5 inch filters (e.g., 20x25x4, 20x25x5): $30 to $80
- Washable filters: $50 to $100 (initial cost, reusable)
Investing in a quality filter can save you in energy costs and system repairs down the road.
What Is the Best Furnace Filter in Canada?
While “best” depends on your needs, some top-rated brands include:
- Filtrete (by 3M)
- Honeywell
- Nordic Pure
- Aerostar
Look for filters with a MERV rating of 8 to 12 for optimal residential use. Canadian homeowners should also consider local climate and heating demands when choosing.
Final Tips from Rick Menard Heating & Cooling
- Check your filter monthly, even if it doesn’t need changing.
- Always keep a few spare filters on hand.
- Book seasonal HVAC maintenance to keep your system running efficiently year-round.
Not sure what size or type you need? Common sizes like 16x25x1, 16x25x4, 20x25x4, and 20x25x5 are widely available, and we can help you find the right fit.
Need Help With Furnace Filter Replacement in Ottawa?
Whether you’re unsure which filter to choose or simply need help changing it, our certified technicians are here to assist. Contact Rick Menard Heating & Cooling today for expert advice, quality service, and all your HVAC needs.
