How Often Should You Change Your Furnace Filter?

Your furnace works hard to keep your home warm during Winnipeg’s long winters, and your filter plays a surprisingly big role in keeping it running efficiently. But how often should you actually change it? The answer depends on your home, your furnace, and your lifestyle.

Why Furnace Filters Matter

Furnace filters trap dust, allergens, pet dander, and other debris. A clean filter means:

• Better air quality inside your home

• Improved furnace efficiency (lower heating bills)

• Longer lifespan for your furnace system

A dirty filter makes your furnace work harder, which can lead to breakdowns or higher energy costs.

General Guidelines

Most manufacturers recommend changing furnace filters every 3 months, but this isn’t one-size-fits-all. Consider the following factors:

1. Type of Filter

• Standard fiberglass: change every 1–3 months

• Pleated high-efficiency: 3–6 months

• HEPA filters: check manufacturer guidelines; usually 6–12 months

2. Home Environment

• Pets: Homes with cats or dogs may need filter changes every 1–2 months

• Allergies: If anyone in your home suffers from allergies, check monthly

• Dust levels: If you live in a construction-heavy area or near dirt roads, change more frequently

3. Furnace Usage

• Winter months: filter may clog faster due to heavy use

• Summer months (if furnace is off but air conditioning uses the same system): check at least once per season

Signs You Need to Change Your Filter

Even if it hasn’t been 3 months, replace your filter if you notice:

• Visible dirt, dust, or discoloration

• Decreased airflow from vents

• Higher heating bills

• Furnace running longer than usual to maintain temperature

Quick Tips for Winnipeg Homeowners

• Mark your calendar or set a reminder every 1–3 months.

• Keep spare filters handy—running out during the middle of a cold snap is never fun!

• Always check your furnace manual for manufacturer-specific guidance.

My Take

Regular filter changes are one of the easiest, most cost-effective ways to keep your furnace and home in top shape. In Winnipeg winters, a clean filter isn’t just convenient—it’s essential for comfort, efficiency, and safety.