Honestly impressed, it does what it is supposed to. Just over 400 square foot garage with an 11 foot ceiling. It is insulated but still a garage...now its a warm garage. I run it on low 16000 btu setting as medium and high tend to cook me out. I work an office/desk job 8 to 10 hours a day in the garage and a 20 lb tank will keep me toasty for an entire work week.