Method and system for variably adjusting indoor temperature of vehicle

A system for variably adjusting an indoor temperature of a vehicle, comprising:

• an object-to-be-protected detector including a selective combination of at least one of a weight detection sensor, an indoor temperature automatic control switch, a microphone and a speaker;
• and
• a controller configured to:
• determine an object to be protected in the vehicle based on a value detected by the object-to-be-protected detector;
• determine a predetermined temperature as an allowable temperature according to the object to be protected;
• determine whether a current indoor temperature of the vehicle exceeds the predetermined allowable temperature of the object to be protected;
• switch an ignition (IG) terminal of a key box of the vehicle to an ON state in response to determining that the current indoor temperature of the vehicle exceeds the predetermined allowable temperature of the object to be protected and
• calculate a sustainable time of indoor temperature control of the vehicle based on at least a required power of the vehicle, an outside temperature, the predetermined allowable temperature, and an available power, the available power being calculated based on a power state of an auxiliary power supply provided in the vehicle and adjust the indoor temperature of the vehicle within a predetermined allowable temperature range or circulate indoor air of the vehicle according to the sustainable time.