Wildfire smoke ruins indoor air quality (IAQ), while ash and soot can wreak havoc on your HVAC equipment. Keeping your home clean in Highlands Ranch, CO, starts with proper filtration and smart system operation.
Whether you live near an active burn zone or hundreds of miles downwind, your health is at risk, as microscopic wildfire smoke particles (PM2.5) easily seep through windows, doors, and ventilation systems.
This guide from Royal Comfort Home Services shows you how to use your HVAC system to keep smoke out of your home without burning out your equipment.
Wildfires and Indoor Air Quality Protection
Wildfires often consume structures and vehicles, creating a toxic mix of fine particles, heavy metals, and gaseous odors. A powerful, proven solution for protecting your home’s air quality and HVAC system is a whole-home in-duct air purifier.
Installed directly into your HVAC ductwork, these purifiers actively treat the air passing through your system while protecting internal components from secondary contamination and buildup:
- Reduces airborne pollutants, including fine smoke particles, volatile organic compounds (VOCs), and stubborn burnt odors.
- Creates a healthier, safer indoor environment during dangerous Air Quality Index days.
- Purifies air continuously throughout your entire home before it recirculates into your living spaces.
Visit our products to learn more about portable and whole-house air purifiers and other IAQ accessories.
7 Wildfire Safety Tips for Air Quality and HVAC Equipment
Whether you live in an area with occasional smoke drift or face yearly wildfire threats, here are critical steps you can take to protect your living spaces and your cooling system:
1. Keep Windows and Doors Closed Against Poor Air Quality
During periods of poor air quality, resist the temptation to open your windows for fresh air. Smoke enters quickly, lingers, and forces your HVAC system to work overtime to filter dirty indoor air.
Use your HVAC system or a portable air purifier to circulate and clean the air indoors.
2. Seal Leaks to Stop Infiltration and System Strain
Use weatherstripping around doors and caulk around windows to keep hot, contaminated air out. Sealing those areas also keeps your air conditioner from overheating under excessive cooling loads.
3. Upgrade to High-Efficiency HVAC Filters (and Protect Your Blower)
Standard filters (MERV 6–8) allow fine smoke particles to pass right through into your ductwork and living areas. If your HVAC system allows it, upgrade to a filter with a MERV of 13 or higher to trap fine smoke particles.
Inspect filters weekly during smoke events and replace them as soon as they look dirty to prevent restricted airflow, which can create wear and tear on your blower.
If you have a ductless mini split, be sure to wash the filters frequently.
4. Use Circulation Mode on Your Thermostat
If your HVAC system has a fan-only or recirculation mode, turn your thermostat fan switch from AUTO to ON during smoky periods. This continuously runs air through your high-efficiency filter without pulling in unconditioned, smoky outdoor air. A smart thermostat can automate this process.
5. Close Outdoor Air Intakes
If your system brings in outside air (often through a metal pipe attached to your ductwork or an ERV/HRV ventilation system), close its manual damper or turn off the intake on your wall thermostat or ventilation controller during heavy smoke events to prevent drawing smoke directly indoors.
If you aren't sure whether your system brings in fresh outdoor air, contact Royal Comfort Home Services to check your setup.
6. Avoid Indoor Particle Sources and Negative Pressure
During wildfire season, avoid burning candles or smoking indoors, and minimize using a gas stove. If you must cook, use lids to control smoke.
Additionally, do not run kitchen or bathroom exhaust fans that vent outdoors—doing so creates negative air pressure that pulls smoky outdoor air into your home and through your HVAC system.
7. Keep Air Conditioning Systems Maintained & Clean
A clogged outdoor AC unit can reduce airflow, strain your compressor, and compromise indoor air quality. Gently brush away loose ash and debris from outdoor condenser fins, or carefully rinse the unit with a hose on a gentle spray setting while the system is turned off.
Create a Clean Room to Safeguard Sensitive Groups
According to the U.S. Environmental Protection Agency (EPA), microscopic wildfire smoke particles pose the biggest health threat. Sensitive groups—including children, seniors, pregnant individuals, and those with asthma or heart conditions—are at the highest risk.
When local air quality hits hazardous levels, dedicate a “Clean Room” in your Highlands Ranch, CO, home that is large enough for everyone:
- Choose the Best Location: Select an interior bedroom, ideally one with an attached bathroom.
- Seal and Protect the Space: Keep doors and windows tightly shut. Avoid cooking and burning candles in this room.
- Maximize Air Filtration: Run a standalone portable HEPA air purifier, or keep your central HVAC fan running continuously with a MERV 13+ filter installed.
Protecting Pets from Wildfire Smoke
Pets are particularly susceptible to air pollution because they breathe rapidly, spend time close to the ground where ash settles, and cannot tell you when they don’t feel well.
- Limit Outdoor Exposure: Keep dogs and cats indoors as much as possible during smoke advisories. Keep bathroom breaks brief and postpone high-cardio activities like fetching or running.
- Wipe Down Paws & Fur: When pets come inside, wipe their paws and coats with a damp cloth to remove ash particles before they lick themselves or track debris into your home.
- Watch for Warning Signs: Keep an eye out for signs of smoke distress in pets, such as coughing, wheezing, watery eyes, uncharacteristic lethargy, or open-mouth breathing (especially in cats). Contact your veterinarian immediately if you notice these symptoms.
DIY Steps to Prepare Your Home Against Wildfire Smoke
These proactive steps can block smoke infiltration and protect your outdoor HVAC equipment:
Carve Out Space: Clear dry brush, leaves, and flammable vegetation within 5 feet of your home's perimeter—and keep at least 3 feet of clear space around your outdoor AC unit so it can draw air without pulling in debris.
Clear Roofs and Gutters: Clean out dry leaves, pine needles, and flammable debris from gutters and roof valleys where windblown embers like to settle.
Move Flammable Materials: Relocate firewood piles, propane tanks, and yard clutter at least 30 feet away from your home's exterior walls.
Seal Entry Points: Ensure windows, exterior doors, and crawl space vents are well-sealed with fresh caulk or weatherstripping to block creeping smoke.
Track Local Air Quality: Monitor real-time wildfire smoke and AQI (Air Quality Index) levels in your immediate area through fire.airnow.gov.
Wildfire Smoke Frequently Asked Questions
Why does the sky look hazy when my AQI app says Good or Moderate?
High-altitude smoke plumes can make the sky look orange or hazy even if ground-level air quality remains relatively clean.
Additionally, local sensors and air monitoring apps may experience a slight reporting lag compared to real-time conditions.
What pollutants are in wildfire smoke, and why is structural smoke worse?
Wildfire smoke primarily consists of fine particulate matter. However, when fires consume homes, vehicles, and building materials, the smoke carries toxic heavy metals and chemicals.
Standard air filters catch physical particles, but active whole-home purifiers are needed to help neutralize gaseous toxins and odors.
How do I protect my air quality if we have to evacuate?
If you must evacuate, keep your vehicle's windows tightly closed and set your car's climate system to recirculate mode so you don't pull smoky outdoor air directly into the cabin.
Protect Your Home’s Air and HVAC System Today
Don't wait for smoke to fill the sky or your air conditioner to overheat. Ensure your system's filters, dampers, and blowers are ready to handle wildfire smoke in Highlands Ranch, CO, and other parts of Colorado.
Call Royal Comfort Home Services at (720) 394-2363 or request service online to schedule your IAQ and system inspection today.