How to Improve Indoor Air Quality During Michigan’s Dry Winters

Michigan winters are famously cold and dry. While the snowy landscapes and cozy nights by the fire have their charms, the drop in outdoor moisture and the constant use of heating systems can create a very different environment inside your home—one that’s uncomfortable and potentially harmful to your health. 

When cold winter air enters your home and gets heated, its relative humidity drops dramatically, leading to dry skin, irritated sinuses, static electricity, and even worsened respiratory conditions.

But the good news? With a few thoughtful changes and habits recommended by Harriman Heating & Air Conditioning, you can significantly improve your indoor air quality (IAQ) and make your Farmington Hills, MI, home healthier and more comfortable throughout the winter.

Why Winter Air Quality Gets Worse in Michigan

Before diving into solutions, it helps to understand the problem. During winter:

• Limited Fresh Air Circulation: With windows and doors sealed against the cold, homes get far less fresh air. This traps stale air and allows indoor pollutants to build up instead of being flushed out.
• Heating Equipment in Constant Use: Winter heating systems—especially forced-air furnaces—can spread dust, pet hair, and other contaminants throughout the home if filters aren’t clean. Fuel-burning heaters (like fireplaces or pellet stoves) may also introduce harmful gases, such as carbon monoxide, when not properly maintained.
• Low Indoor Humidity: Cold winter air contains very little moisture. Once heated indoors, it becomes even drier, creating an environment where dust, germs, and fine particles remain suspended longer and can aggravate dry skin, sinuses, and respiratory passages.
• More Indoor Living: Shorter days and colder temperatures keep families inside more often. Everyday activities like cooking, burning candles, and using cleaning products all add airborne pollutants such as smoke, odors, and VOCs.
• The Stack Effect Is at Work: As warm air rises and escapes through upper levels of the home, it creates a vacuum that draws colder air in from basements, garages, or crawl spaces—often carrying dust, mold spores, and other unwanted pollutants into living spaces.

How to Improve IAQ During Michigan’s Dry Winters

1. Maintain Comfortable Humidity Levels (30%–50%)

One of the most effective ways to counter dry winter air is by keeping indoor relative humidity between about 30% and 50%. That range helps reduce dryness in the skin and nasal passages, while also making the air feel warmer and more comfortable.

Here’s how to manage humidity levels:

• Use a hygrometer: This inexpensive device measures humidity so you know when adjustments are needed.
• Install a humidifier: A whole-house humidifier connected to your HVAC system helps maintain steady moisture levels. Portable humidifiers work well in bedrooms or living rooms, but require regular cleaning to avoid mold or bacteria buildup. 
• Bonus tip: Natural methods like leaving the bathroom door open after a hot shower, boiling water occasionally, or air-drying laundry indoors can all add moisture to your air.

Just be cautious: if humidity climbs above about 50%, you could promote mold growth and attract dust mites, so balance is key.

2. Regularly Change and Upgrade HVAC Filters

Your furnace or heat pump constantly moves air throughout your home, and the air filter is the first line of defense in capturing dust, dander, pollen, and other airborne particles.

• Replace filters every 1–3 months, or more often if you have pets or allergies. 
• Consider filters with a higher MERV rating to trap smaller particles—but check your system’s manual first so you don’t impede airflow. 
• Clean filters help your system perform better, reduce the circulation of allergens, and can even save on energy costs.

3. Ventilate When You Can

Although it’s tempting to keep windows closed all winter, brief ventilation helps bring fresh air in and reduce pollutant buildup.

• Open a couple of windows for 5–10 minutes daily, ideally on opposite sides of the house to create a cross-breeze.
• Use kitchen and bathroom exhaust fans to remove moisture and odors right at the source.
• If frequent window opening isn’t practical, consider installing a heat recovery ventilator (HRV) or energy recovery ventilator (ERV)—systems that bring in fresh outdoor air while preserving indoor heat.

4. Clean Smart (and Green) and Often

Dust and allergens can settle quickly on surfaces during winter when air circulation is limited. A regular cleaning routine can help:

• Vacuum with a HEPA filter to trap fine particles. 
• Steam clean carpets annually, particularly if you have pets or kids. 
• Dust with damp cloths to prevent particulates from becoming airborne.
• Wash bedding and fabrics weekly to reduce allergens. 

5. Use Air Purifiers or Air Scrubbers for Added Protection

Air purifiers can play an important role in improving indoor air quality, especially models equipped with HEPA filtration that capture fine particles HVAC filters often miss. To further enhance protection, many homeowners choose air scrubbers that integrate directly with the HVAC system, treating the air every time it circulates through the home.

In addition to particle removal, look for purifiers or air scrubbers that include activated carbon filters to help reduce odors and volatile organic compounds (VOCs) from cleaning products, cooking, and household materials. 

More advanced air scrubber systems may also use UV or photocatalytic technology to help neutralize bacteria, viruses, and mold spores, providing whole-home air purification rather than room-by-room coverage.

6. Be Mindful of Indoor Pollutants

Winter activities can introduce additional contaminants:

• Avoid smoking indoors
• Vent appliances properly to prevent carbon monoxide buildup
• Choose low-VOC cleaning products
• Ensure fireplaces and fuel-burning equipment are well-vented. 

The EPA warns that blocked vents and poor ventilation during winter can increase harmful indoor pollutant levels.

Consult With Local IAQ Experts in Farmington Hills, MI

Michigan’s dry winters may present challenges for indoor air quality, but with the right strategies in place you can make your home safer, healthier, and more comfortable throughout the cold season. Balance humidity, keep your heating and ventilation systems in top shape, and adopt regular cleaning and air circulation habits to breathe easier—even when temperatures plummet outside.

For personalized recommendations and long-term solutions, consider consulting with the local indoor air quality experts at Harriman Heating & Air Conditioning serving Farmington Hills, MI, and the surrounding area. Call 734-271-6200 today or request service online. 

Our experienced team can evaluate your home, recommend the right IAQ improvements, and help ensure your indoor environment stays clean and comfortable all winter long.