The noise could be caused by the fan,compressor, or other operating components. Reasonable noise levels are withinan acceptable range, but if the noise is unusually loud, it may be necessary tocheck for loose or damaged parts.

In extremely cold weather, the heatingefficiency of the heat pump may decrease, resulting in a lower air temperaturebeing blown out. In such cases, using auxiliary heating equipment to raiseindoor temperatures can be considered.

It's generally recommended to performmaintenance annually to ensure the normal operation and efficient performanceof the heat pump. Maintenance includes cleaning filters, checking refrigerantlevels, adjusting the system, and more.

A decrease in heating efficiency could be due tosystem malfunctions, refrigerant leaks, valve issues, and other reasons. Timelycontact with professional technicians for inspection and repair is necessary.

A reduction in cooling efficiency might becaused by factors such as overworking, insufficient refrigerant, or blocked airducts. Checking the condition of air ducts and refrigerant levels and maintainingproper ventilation is the first step to solving the problem.

In heating mode, a heat pump consumes less electricitycompared to traditional electric heaters because it uses ambient heat to warmindoor air. However, efficiency may decrease in extreme temperatures.