What is the highest sustained room temperature in the heating mode and lowest cooling temperature in the cooling mode?
Sustaining temperatures far outside the comfort range is a unique situation but is possible within reason. The limiting factor is the pressures of the refrigerant at those extremes, because the pressures of the refrigerant are directly proportional to the temperatures of the refrigerant, and the temperature of the air over the indoor coil dictates the temperature of the refrigerant. I can hypothetically determine the temperature extremes, though these air temperatures have not been tested or proven as far as their limits go. Expect the highest indoor temperature to be sustained between 38°C and 45°C. Expect the lowest indoor temperature to be sustained between 10°C and 15°C. Temperatures below this begin to drift into the Medium Temperature Range. These temperatures are used for refrigeration, and, while the EarthLinked could continue to drop the temperature lower, it would require a method of defrosting the indoor coil, because it would be operating below freezing (32°F). EarthLinked’
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