I grew up with metric, and all I've ever known is Celsius for outdoor temperature, but our thermostat was always Fahrenheit growing up, so I couldn't tell you if 18 or even 24 is really hot or cold for an indoor temperature. Its almost as if there are 2 sets of temperature ranges, completely independant of one another.
My house is set to heat to 67 and cool to 72. Heat hasn't kicked in yet (thanks to 3 stories facing south)
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