Vacuum Cleaners with a HEPA 13 Filter

About our comparison method

To provide the most accurate and unbiased picture of which products are the best, we do the following:

• We gather user reviews from many different sources. Sources that have too many positive reviews are filtered out. You can view the source of each product review (note that in some cases, the reviews may be anonymous).
• We collect expert reviews from various sources. Reviews about products received for free are removed. It is also important that the expert has physically tested the product.

A score is calculated based on this data. We do not modify product scores, and payment or products from brands to promote specific products are not accepted.

Biases

We are not perfect. There will always be biases that can affect the ranking of products. The following biases may arise:

• If the brand or the sources we use in our reviews have employed aggressive strategies to receive positive reviews for certain products or if they delete negative reviews. We are aware of this and try our best to exclude these sources.
• If most of a product’s reviews come from one source.
• If the price has increased significantly since most reviews were submitted, we automatically try to remove these products. However, this is not always successful.
• Some technological products, such as robot vacuums, quickly become outdated. Reviews may be several years old, making the products appear better than they are. We try to avoid this by downgrading or removing such products.
• There may be errors in the data we use to calculate the score. Some data is collected automatically, and there can be errors in the information we receive. Other data is manually collected, and typos can occur.
• In most cases, we collaborate with the largest and most popular retailers, although this is not true for all product categories. Our comparison includes only products from retailers we collaborate with.

Other important information about our comparison:

• The reviews and scores are generally updated at the beginning of each month.
• Prices are updated daily, typically in the morning (depending on the retailer).
• Products no longer available are automatically removed from the ranking.
• If the price we display does not match the actual price, it is either because the price has changed since our last update or because we have received an incorrect price from the retailer.

We can make mistakes. Therefore, you should always double-check information.