To find the best space heaters, editors considered professional tests, expert reviews and user feedback. ConsumerReports.org has the most comprehensive hands-on testing. TheSweethome.com's coverage is a little more limited, but it looks at popular and well-reviewed space heaters, then tests to find a couple of top choices. Good Housekeeping's reviews are mostly older, but many of the models covered are either still available or have been replaced by space heaters that are largely similar. We also rely heavily on user reviews, looking at feedback posted at Amazon.com, HomeDepot.com, Lowes.com, Walmart.com and elsewhere. These reviews provide an up-to-date snapshot of how space heaters perform, and touch on long-term factors, such as the reliability of a specific model, that are beyond the scope of most expert testing. Using this feedback, we consider performance, safety and reliability to name the very best space heaters, along with alternative choices that could be worth considering for some buyers.