The solid state ones don't use refrigerant, just some semiconductors. Those have no difficulty at all getting to high temperatures. (Solid state heat pumps don't work very effectively at low temperatures but can operate at temperatures much higher than a compressor heat pump.) Some old compressor based dryers ran on R22. I think the newer ones use R134a since R410a would need insane pressures to work at such a high temperature.
The LG I have has a 250W solid state heat pump along with a 1000W auxiliary heater to get it up to temp quickly. I think the compressor based units are 8000BTU/hr but I'm not sure.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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