climate.downstairs:
  friendly_name: 'Nest Downstairs'
  icon: mdi:air-conditioner
climate.upstairs:
  friendly_name: 'Nest Upstairs'
  icon: mdi:air-conditioner

sensor.downstairs_humidity:  
  icon: mdi:water-percent
sensor.upstairs_humidity:  
  icon: mdi:water-percent