Need advice on replacing old through-the-wall air conditioner

I have a 30-year old AC wall-through unit in a guest house that's about 450 square feet. The unit is a Friedrich. I want to replace it with a new one that will fit in the same sleeve, preferably a 230W one with a heat pump built in. Any advice on who makes good units that will fit in the old wall sleeve (which is ~25.5"h x 17.5"w)? I like LG appliances but it's got to fit.

submitted by zuzumang
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