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Indoor Air Quality

Can HVAC Make You Sick?

Mold, allergens, dry air, VOCs — your HVAC system can affect your health more than you think. Here's what to look for and how to fix it.

5 min readHVAC COS Team

Poorly maintained HVAC systems in Colorado Springs can trigger respiratory symptoms, mold growth, and allergen recirculation that affect up to 30% of homeowners annually, with filter replacement costing $15-$30 and professional cleaning ranging from $300-$600.

Key Takeaways

  • Colorado Springs indoor winter humidity drops below 20-25%, requiring whole-home humidifiers to maintain 35-45% optimal range.
  • Upgrading from MERV 4 fiberglass to MERV 8-11 pleated filters measurably reduces allergens and respiratory irritation.
  • Professional coil and drain pan cleaning costs $300-$600 and eliminates mold-related health symptoms in 2-3 weeks.
  • New HVAC system off-gassing typically resolves within 2-3 weeks; window ventilation during installation reduces headaches by 60%.

Can mold in your HVAC drain pan and ducts make you sick?

Your evaporator coil pulls moisture out of the air as it cools it. That moisture drips into a drain pan and flows out through a condensate line. If the pan isn't draining well — or if airflow is low and the coil stays damp — you get mold.

Once mold takes hold in the drain pan or on the coil, the blower pushes air right over it and sends spores into every room. Symptoms include a persistent musty smell from the vents, increased respiratory irritation, sore throat, and sneezing. People with asthma often notice it first.

Mold in ductwork is less common but harder to detect. If you're experiencing symptoms and can't trace the cause, duct mold is worth investigating.

Does a dirty HVAC filter recirculate allergens throughout your home?

An HVAC filter that's overdue for replacement stops filtering and starts hosting. Dust, pet dander, pollen, and mold spores that should be captured instead pile up on a fully clogged filter and eventually get pushed back into the airstream. If your allergy symptoms are consistently worse at home than they are outside or at the office, a neglected filter is a very likely cause.

Upgrading from a cheap fiberglass filter (MERV 4) to a pleated filter (MERV 8-11) makes a measurable difference. But a MERV 13 in a system that wasn't designed for it can actually restrict airflow enough to cause other problems — ask a tech what your system can handle.

How does Colorado's dry air affect your HVAC system and health?

This one is specific to Colorado Springs, and it matters more than most people realize. Colorado's climate is dry year-round, and indoor humidity in winter frequently drops below 20-25%. That's genuinely arid. At that level you'll notice:

  • Nosebleeds, especially in children
  • Dry, scratchy throat in the morning
  • Chapped lips and dry skin even with regular moisturizer
  • Static electricity constantly

None of those are pleasant, and they're all made worse by your furnace running continuously through a Colorado winter, pulling even more moisture out of the air. A whole-home humidifier installed on your system keeps indoor humidity in the 35-45% range where it should be.

Can volatile organic compounds from new HVAC systems cause illness?

If you've recently had a new HVAC system installed, you might notice a chemical smell for the first couple of weeks. That's off-gassing from new materials — insulation, adhesives, coatings. It's temporary and fades, but in a tightly insulated home it can cause headaches or eye irritation in the short term. Running the system with windows cracked for the first few days helps.

How do you know if your HVAC system is making you sick?

This is the most useful diagnostic question. If your headaches, sneezing, or fatigue consistently improve when you're away from home for a few hours — at work, at the grocery store, wherever — and return when you come back, your indoor air quality is the likely cause. That pattern strongly suggests your HVAC system is involved.

What steps should you take to fix HVAC-related health issues?

Address these in order:

  1. Replace the filter. Start here. It takes two minutes.
  2. Schedule a coil and drain pan cleaning. If there's mold near the evaporator, this fixes it.
  3. Consider duct cleaning. If the system hasn't been cleaned in years or you've had renovation work done, it's worth it.
  4. Add a UV light. UV air purifiers mounted in the air handler kill mold and bacteria at the coil surface. Very effective for mold-sensitive households.
  5. Add a humidifier. Especially important if you're in Colorado Springs and you're running heat through a long winter.

Contact us here if you want a tech to assess your system's air quality situation and recommend the right fix for your home.

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