懂房子的来传授下经验--Air-Conditioner Tune-Up和Furnace Tune-Up有必要做吗

[不懂就问问]

需要一年一次不？
什么季节需要？
谢谢

• an air-conditioner tune-up . Each service includes:
  
  • Monitoring refrigerant pressure and cooling cycle
  • Testing AC starting capabilities
  • Inspection of indoor coil
• a furnace tune-up. Each services includes:
  
  • Full cleaning and tune-up
  • Filter replacement
  • Efficiency analysis