Air Quality Upgrades Explained
Every IAQ product you'll see on an HVAC quote — what actually works, what the independent research shows, and which ones are pure margin for the contractor.
Tier 1 — Actually Works
Whole-House Dehumidifiers
The most legitimate IAQ product for humid climates. Removes moisture independently of your AC — critical when your system can't hold humidity below 55% on its own.
ERV / HRV Ventilators
The underutilized legitimate IAQ product. Brings fresh outdoor air in while recovering most of the energy from the air being exhausted — essential for tight modern homes.
Air Filters & MERV Ratings
The cheapest part in your HVAC system and the single highest-leverage air quality upgrade. Understanding MERV ratings tells you almost everything about residential filtration.
Tier 2 — Sometimes Works, Often Oversold
UV-C Germicidal Lamps
UV-C kills microbes — that part is real. What's contested is whether residential HVAC installs actually deliver enough dose to matter. Where the lamp mounts determines everything.
Polarized Media Air Cleaners
Electronic filtration that uses a low-voltage charge to boost particle capture. Better than a basic pleated filter, more expensive than it needs to be — and usually oversold.
Photocatalytic Oxidation (PCO) Systems
UV plus titanium dioxide catalyst breaks down VOCs in theory. The chemistry is real; real-world residential performance falls well short of marketing claims — and can produce harmful byproducts.
Tier 3 — Mostly Marketing
Bipolar Ionization Devices
The aggressive post-2020 IAQ upsell. iWave, REME Halo, GPS devices. The chemistry has a basis; the gap between manufacturer claims and independent real-world results is wide.
Ozone-Generating Air Cleaners
Marketed as 'activated oxygen' and 'odor control' — but ozone is a documented respiratory irritant. The EPA, American Lung Association, and CARB all warn against indoor ozone generators.