3 ms·
bluGill answered this well. To add a little: the total load of all but the smallest systems (9/12k BTUs/hour) is too large for a typical 15A @ 120V circuit, so
by troydavis 6y ago
bluGill answered this well. To add a little: the total load of all but the smallest systems (9/12k BTUs/hour) is too large for a typical 15A @ 120V circuit, so most outdoor units need 220V. That means a new circuit. Also, building code in the US typically requires a shut-off box right next to the outdoor unit.
At least in the US, many systems power the indoor unit(s) from the outdoor unit. My guess is that since a control wire is required anyway (for central control of fan speed and direction), the manufacturers think it’s easier to power everything from one run.