Indoor Air Quality Services

Cleaner Air Starts with the Right System

Most people spend up to 90 percent of their time indoors, yet indoor air can be two to five times more polluted than outdoor air according to the EPA. Dust, pet dander, pollen, mold spores, bacteria, viruses, volatile organic compounds from cleaning products and building materials, and even wildfire smoke during Pacific Northwest fire season all contribute to poor indoor air quality. For families with allergies, asthma, or other respiratory conditions, these invisible pollutants can trigger symptoms and reduce quality of life. Even for healthy households, poor air quality causes fatigue, headaches, and difficulty concentrating.

At Treat's Heating & Cooling, we take a whole-home approach to indoor air quality. Rather than treating symptoms with a single product, we assess your home's unique conditions -- including humidity levels, existing filtration, ductwork integrity, and the specific pollutants affecting your family -- and design a customized solution that addresses the root causes. Our indoor air quality services include whole-home air purifiers, HEPA filtration systems, UV germicidal lights, humidifiers, dehumidifiers, ventilation improvements, and professional duct cleaning. Each solution integrates directly with your existing HVAC system for seamless, whole-home coverage.

The Pacific Northwest presents unique indoor air quality challenges. Our wet climate encourages mold and mildew growth, while tight building construction designed for energy efficiency can trap moisture and pollutants inside. Summer wildfire smoke has become an increasingly common concern, penetrating homes and creating hazardous conditions even indoors. Our technicians understand these regional factors and recommend solutions specifically suited to Western Washington homes, helping you maintain healthy indoor air year-round regardless of what is happening outside.

Whole-Home Air Purifiers

Our whole-home air purification systems install directly into your HVAC ductwork, treating all the air that circulates through your home. We install advanced purifiers that use a combination of filtration, ionization, and photocatalytic oxidation to capture and neutralize particles, pathogens, and gases. Unlike portable air purifiers that only address a single room, whole-home systems provide consistent protection throughout every room in your house. They operate silently, require minimal maintenance, and do not take up floor space.

HEPA Filtration Systems

HEPA (High Efficiency Particulate Air) filters capture 99.97 percent of particles as small as 0.3 microns, including dust mites, pollen, mold spores, pet dander, and many bacteria. We install whole-home HEPA bypass filtration systems that work alongside your existing HVAC system without restricting airflow. These systems are especially valuable for allergy and asthma sufferers who need the highest level of particle removal. We also offer high-MERV media filter upgrades for homes where a full HEPA system is not necessary but improved filtration is desired.

UV Germicidal Lights

Ultraviolet germicidal irradiation (UVGI) uses UV-C light to destroy the DNA of airborne microorganisms, rendering bacteria, viruses, and mold spores unable to reproduce. We install UV lights inside your duct system, typically near the evaporator coil where mold is most likely to grow due to the moist conditions. This not only improves air quality but also keeps your coil cleaner and your system running more efficiently. UV germicidal lights are a chemical-free solution that provides continuous protection 24 hours a day.

Humidity Control: Humidifiers and Dehumidifiers

Proper humidity plays a critical role in comfort and health. The ideal indoor relative humidity range is 30 to 50 percent. In winter, heated air becomes excessively dry, causing dry skin, irritated sinuses, static electricity, and cracking wood floors and furniture. A whole-home humidifier adds moisture to the air distributed through your ductwork, maintaining comfortable humidity levels throughout the house. Conversely, the Pacific Northwest's damp climate can drive indoor humidity above healthy levels, promoting mold growth and dust mites. A whole-home dehumidifier removes excess moisture before it becomes a problem. We install and maintain both types of systems, often as part of a comprehensive indoor air quality upgrade.

Professional Duct Cleaning

Over time, dust, debris, pet hair, construction residue, and even mold can accumulate inside your ductwork. Every time your HVAC system runs, it circulates these contaminants through your home. Professional duct cleaning removes built-up debris using specialized equipment, improving airflow, reducing allergens, and helping your system operate more efficiently. We recommend duct cleaning every three to five years, or sooner if you have recently completed construction, moved into a new home, or noticed visible dust or musty odors from your vents.