The Mr. Slim you pictured looks like one of the older models. It doesn't have the hyper-heat sticker on it, so it will lose capacity below freezing. If it is an inverter model, it can over-rev the compressor up to about 150% to try to keep up, so down to freezing, it will hold its own. Below 0 degC, it will lose capacity, and at -25 degC it might put out half its rated capacity.
If it's not an inverter unit, all bets are off. You will need backup heating below about -10 degC. Can't really tell by looking at the box. Mr. Slim units have looked pretty similar for the last 25 years, especially the outdoor units. Reading the nameplate and looking up the model number is the easiest way to tell what lives in the box.
You can get a lot of second-hand insulation for that much money.
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