How we pick and rank

Last updated: October 25, 2026

1. Find the right products

For each search we pull the matching products on Amazon and keep only items of the right type (a space heater guide never lists a heater cover or a filter). If the search asks for something specific, such as a remote, HEPA filter, quiet operation or a price cap, each product's own listing must say so. Products need a reasonable number of buyer ratings and enough listing detail to compare; we limit how many picks can come from one brand and how often one product appears across guides.

2. Read the specs

Our software reads each listing and pulls the figures that matter for that appliance: coverage and BTU for air conditioners, pints per day for dehumidifiers, CADR and filter type for purifiers, capacity for kitchen appliances, run time and suction for vacuums, and so on. Where makers use different test standards (for example DOE versus ASHRAE BTU on portable air conditioners, or 2012 versus 2019 DOE pints on dehumidifiers) we keep them apart and never compare one against the other.

3. Score and label

Each pick gets a spec score from the figures its listing gives, weighted for that appliance type, combined with how many buyers have rated it on Amazon. Labels such as "Highest CADR" or "Lightest Pick" are set by the numbers only when every pick states that figure. Every figure shown is matched to the exact listing text it came from; figures we cannot confirm, or that the listing gives two different ways, are shown as a dash and do not count for or against the score.

4. Write it plainly

The short judgments on each page are checked by code before publishing: no numbers that are not in the listing data, no claims of hands-on testing, no prices or star ratings, and no health or safety promises.

Commissions never affect the order. No brand pays to be listed.