I got this heater for my back patio since I enjoy sitting outside even when it's cold. I have a propane heater that's AMAZING but don't always want to use propane. Overall, this functions well in the moderate cold. I doubt it would perform as well under 40° unless you're sitting pretty close to it. The output range isn't very far but it's still decent. especially for the price. Comparable heaters are going for $100 more than this so it's a great deal for a decent amount of heat. but you won't be toasty.
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