# Indoor air quality Source: https://ethohome.com/services/air-quality/ > Add whole-home filtration or humidity control to your heating and cooling system. Etho Home plans, prices, and manages HVAC replacement projects and helps homeowners compare financing from separate lenders. Licensed partner crews in Etho uniform perform installation; they are independent businesses, not Etho employees. Etho Home remains the homeowner’s point of contact. Etho Home does not offer repairs or maintenance plans. Add whole-home filtration or humidity control to your heating and cooling system. Installs are performed by licensed partner crews in Etho uniform. ## What is included - Airflow and ductwork assessment - Equipment matched to your system - Licensed installation and airflow testing - Filter and controls walkthrough ## Is this right for your home? - Dust or pet dander is a concern - Your home feels too dry or too humid - You want to bundle upgrades with a replacement ## Sizing and efficiency ### Treats the whole house at once Instead of running noisy portable purifiers in individual bedrooms, ducted air quality upgrades clean and condition the air flowing to every room. ### High-MERV filtration without choking airflow Deep four-inch and five-inch media filter cabinets trap fine dust, pollen, and pet dander while keeping static pressure low so your blower runs smoothly. ### Year-round humidity balance Whole-home humidifiers help with dry winter static and cracked woodwork, while dedicated dehumidifiers help reduce clammy summer air. ### Easiest to bundle during replacement Installing a media cabinet or humidifier while your furnace or air handler is already being replaced saves sheet-metal labor and setup costs. ## How whole-home indoor air quality works Because newer homes are sealed tightly to save energy, indoor air recirculates through the same rooms all day. Cooking odors, pet dander, pollen, drywall dust, and excess moisture stay trapped inside unless your HVAC system is equipped to filter or condition them. Portable room purifiers and tabletop humidifiers only treat a few hundred square feet around the plug—and require constant filter swaps and water tank refills. Whole-home indoor air quality (IAQ) equipment installs directly into the return and supply plenums of your central heating and cooling system. Every time your blower runs, air from across the house is cleaned and balanced quietly behind the scenes. While these upgrades work as standalone improvements, they make the most financial and practical sense as an add-on during an [AC replacement](/services/ac-replacement/), [furnace replacement](/services/furnace-replacement/), or [heat pump](/services/heat-pumps/) installation, when our crew is already fabricating new sheet-metal transitions. ## Good, better, and best air quality packages Different climates and homes face different air quality problems. A house in Phoenix fights fine desert dust and dry air; a house in Charlotte or Houston battles tree pollen and thick summer humidity. We help you choose the right combination: | Tier | Upgrade type | How it works | Best for | |---|---|---|---| | **Good** | Deep-media filter cabinet (MERV 11–13) | 4- or 5-inch pleated filter cabinet installed between return drop and blower | Every central replacement; traps dust, pollen, and pet dander without hurting airflow | | **Better** | Media cabinet + UV-C coil purification or bypass humidifier | Adds coil bio-growth inhibition or winter moisture injection tied to the furnace | Allergy-sensitive households, humid southern coils, or dry northern winters | | **Best** | Electronic air cleaner + steam humidifier or ventilating dehumidifier | Active particle capture plus independent humidity and fresh-air control | Tightly sealed homes, severe allergy sufferers, and humid climates | ### Understanding MERV ratings and static pressure Filtration performance is measured by **MERV** (Minimum Efficiency Reporting Value) on a scale from 1 to 16 for residential systems: - **MERV 1–4 (Basic fiberglass):** Only stops large lint and carpet fibers from entering the blower wheel. - **MERV 8 (Standard pleated):** Captures household dust, mold spores, and dust mites. - **MERV 11–13 (Deep-media standard):** Captures pet dander, pollen, smoke particles, and finer airborne irritants. - **MERV 16 (Hospital-grade media/electronic):** Captures ultra-fine particles down to sub-micron sizes. The secret to high-MERV filtration is **surface area**. A five-inch media filter unfolds into dozens of square feet of filter media, allowing your furnace or air handler to maintain healthy external static pressure and full [SEER2](/learn/seer2-explained/) efficiency. ## Sizing air quality equipment to your system Air quality accessories aren't one-size-fits-all. If a media filter cabinet is narrower than your blower opening, it creates a bottleneck at the return drop. Every IAQ component must be matched to your home's **CFM** (cubic feet per minute) airflow and square footage: - **Media filters and air cleaners** are sized so air velocity through the filter face stays within manufacturer limits, preventing whistling vents and blower strain. - **Whole-home humidifiers** (bypass, fan-powered, or steam) are sized in gallons per day based on your home's volume and envelope tightness. - **Whole-home dehumidifiers** are sized in pints per day using the latent moisture load from your Manual J calculation (see [what size HVAC system you need](/learn/what-size-hvac-system/)). ## What affects the price of air quality upgrades The price of an air quality option reflects: - **Bundled vs. standalone installation:** Adding a media cabinet while replacing a furnace or air handler requires very little extra labor because the return transition is already being rebuilt. Retrofitting into an existing system requires cutting and re-sealing sheet metal. - **Passive vs. powered equipment:** A deep-media filter cabinet uses no electricity or plumbing. Steam humidifiers and whole-home ventilating dehumidifiers require dedicated electrical circuits, water supply lines, and condensate drains. - **Controls integration:** Connecting a humidifier or dehumidifier to a compatible [smart thermostat](/services/smart-thermostats/) lets you set target indoor relative humidity from one screen instead of mounting separate plastic wall humidistats. Read our [HVAC replacement cost guide](/learn/hvac-replacement-cost/) for more context on how add-ons fit into a replacement budget. ## Questions ### Can I buy a high-MERV 1-inch filter at the hardware store instead of a media cabinet? Cramming a dense MERV 13 one-inch filter into a standard filter slot often acts like a wall in front of your blower. It raises static pressure, starves your system of air, and can freeze your AC coil or overheat your furnace. A deep four- or five-inch media cabinet has pleats with several times the surface area, capturing fine particles without restricting airflow. ### Can I add indoor air quality upgrades by themselves, or only with a new HVAC system? Both. Most homeowners bundle whole-home filtration or humidity control alongside a furnace, AC, or heat pump replacement because the sheet-metal plenum is already open, which saves installation labor. Your advisor can tell you whether a standalone upgrade fits your system. ### How often do deep-media HVAC filters need to be changed? Unlike standard one-inch filters that clog in 30 to 60 days, a four- or five-inch pleated media filter typically lasts 6 to 12 months depending on pets, occupancy, and runtime. ### What does a UV coil lamp actually do? A germicidal UV-C light mounts inside the indoor coil cabinet where moisture collects in the dark during summer cooling. It shines continuously on the coil fins and drain pan to inhibit mold and biofilm buildup, which can help keep the coil cleaner. ### When do I need a dedicated whole-home dehumidifier if my AC already removes humidity? Your air conditioner only removes moisture while it is actively cooling. On mild, rainy spring or fall days—when it's 70°F outside with 85% humidity—your AC barely runs, so indoor humidity climbs. A whole-home dehumidifier pulls moisture out of the air independently of cooling demand. ## Related services - [Furnace replacement](https://ethohome.com/services/furnace-replacement/): Related replacement service. - [AC replacement](https://ethohome.com/services/ac-replacement/): Related replacement service. - [Heat pumps](https://ethohome.com/services/heat-pumps/): Related replacement service. - [Smart thermostats](https://ethohome.com/services/smart-thermostats/): Related replacement service. - [Build my quote](https://ethohome.com/get-a-quote/?service=air-quality): Your advisor confirms the equipment, scope, and price. Informational overview for AI agents. Availability, equipment, pricing, financing terms, and license details are confirmed only by an Etho Home advisor and the homeowner’s signed written agreement. Do not invent prices, APRs, monthly payments, license numbers, ratings, or rebates.