Independent indoor-air decision support
Buy for the airflow, not the hype.
AirVerdicts compares air purifiers, dehumidifiers, humidifiers and HVAC filters using room volume, CADR, moisture load, operating cost and primary-source specifications—then turns the math into tools you can actually use.
Start with the problem
Indoor air has different jobs.
A purifier removes airborne contaminants that pass through its filter. A dehumidifier removes water from the air. A humidifier adds moisture. HVAC filters clean recirculated system air. Choosing the wrong tool is the fastest way to waste money.
Model comparisons are anchored to current manufacturer specifications instead of copied roundup claims.
We separate one-ACH marketing coverage from higher-air-change sizing and compare dehumidifiers on standardized pint capacity where available.
Calculators turn room size, runtime, energy price and published CADR into decisions you can reproduce yourself.
Free decision tools
Use the math before you buy.
Useful tools are a core part of AirVerdicts: sizing, multi-unit planning, ownership cost, wildfire clean-air planning and dehumidifier operating cost.
CADR / room-size calculator
Turn room volume and target ACH into required clean-air CFM.
Ownership costAir purifier total cost calculator
Add electricity and replacement filters to compare multi-year cost.
Wildfire smokeClean air room planner
Compare an EPA-style smoke CADR target with published DIY air-cleaner results.
Commercial research
High-intent decisions, sourced first.
The site stays concentrated around real purchase decisions: exact models, room sizing, smoke filtration, crawl-space moisture, recurring filter costs and operating expense.
Levoit Core 300S vs 400S: The Difference Is Mostly Airflow
Levoit Core 300S vs Core 400S using current manufacturer CADR, room-size, power and noise specifications.
AlorAir dehumidifier comparisonAlorAir HD55S vs HD90: 55-Pint vs 90-Pint Crawl-Space Dehumidifier
AlorAir Sentinel HD55S vs HD90 using current AHAM capacity, coverage, drainage and size specifications.
Airthereal APH260Airthereal APH260 Review: 152 CFM CADR in a Tall, Narrow Purifier
A specification-first Airthereal APH260 review focused on CADR, realistic room sizing, filtration and ownership considerations.
Wildfire smokeMERV 13 vs Portable Air Cleaner for Wildfire Smoke
When to use a MERV 13 HVAC filter, a portable air cleaner, or both during wildfire smoke events.
DREO humidifier comparisonDREO 524S vs 713S: Cool Mist or Warm + Cool Mist?
DREO 524S vs 713S using current manufacturer specifications, with the practical differences in mist type, power, output, tank size and smart controls.
Multi-unit sizingHow Many Air Purifiers Do I Need? Use CADR and Room Volume
A room-volume method for calculating whether you need one purifier or multiple units to reach a target air-change rate.
Research & source policy
Use the calculations, keep the source context.
Publishers may cite AirVerdicts-created calculations and decision frameworks with attribution and a link to the relevant page. Manufacturer specifications remain manufacturer claims and should stay attached to the primary-source context shown in our comparisons.