Sweet! That did the trick. Not sure how I overlooked that unit property. Thank you so much!
UPDATE:
Here’s my manual card config:
type: custom:pool-monitor-card
sensors:
temperature:
- entity: sensor.pool_temp
name: Water Temperature
setpoint: 85
unit: ‘°F’
- entity: sensor.air_temp
name: Air Temperature
setpoint: 36
unit: ‘°F’
orp:
- entity: sensor.orp
name: Oxidation Reduction
salinity:
- entity: sensor.spa_salinity
For the associated top card in this dashboard view:
I now want to invest in chemical and water level smart capabilities 