Shark R-HC501 3-in-1 Heater & Air Purifier

UPDATE: Quit working altogether. I tried unplugging and replugging, a different outlet, let it rest for a day, took turned the filter, nothing worked. It just turned off and won't come back on. The online user manual provided no help. Bummer, it was great while it lasted. I bought a refurbished one because it was much less expensive. Super happy with it! I am a smoker and only smoke on my enclosed porch. Most seasons I have the windows open for clean air and ventilation. But during Winter I have to have the windows closed and the smoke builds up after awhile. This little piece of mechanical wonder suits my needs perfectly! My air cleaner arrived on time, in nearly perfect condition with just a small spot where the silver color appeared to be scraped. Setup was easy and straight forward. The air cleaner function works great! Clears the smoke and greatly reduces odor. When only the air cleaner is running the machine is silent. At first I thought it wasn't working, but it did it's job without a sound. The fan function was nice during warmer temps, without being too loud. It doesn't blow very hard, but I could feel the air moving at around 4'. The heater function has kept the room at my set temperature, even when the outside temp went into the 20s. If I have any criticism to offer it would be that the readout and remote are not intuitive and take a little getting used to.