Duo Therm AC freezing up

dougrainer wrote:
1. They only have 1 lb of coolant, so if you had low coolant, the unit would be TOO LOW on coolant to cool . This is NOT your problem
2. IF you have a wall tstat, then your unit has a freeze sensor. If you have a freeze sensor, it CANNOT freeze unless the sensor is defective or is NOT installed in the evaporator coils.
3. IF you have manual roof top Controls, then freezing is a possibility, you need to run on HI Cool and make sure the Evap fins are clean and your Air filter/s are clean. Doug

Not meaning to argue but low refrigerant will cause freezing coils. AC works by absorbing heat. With low refrigerant ,which results in low pressure it can't absorb enough heat and the coils freeze

lack of air flow, check filters, try not running on hi.

1. They only have 1 lb of coolant, so if you had low coolant, the unit would be TOO LOW on coolant to cool . This is NOT your problem
2. IF you have a wall tstat, then your unit has a freeze sensor. If you have a freeze sensor, it CANNOT freeze unless the sensor is defective or is NOT installed in the evaporator coils.
3. IF you have manual roof top Controls, then freezing is a possibility, you need to run on HI Cool and make sure the Evap fins are clean and your Air filter/s are clean. Doug

Looks like a trip to the roof is in order. Thanks for the replies. I will report back with my findings.

Two issues as to why an AC will freeze. Low Coolant, Plugged fins on rooftop unit

Have you reviewed placement location of the freeze sensor?
Access is from the inside.

Agree with your neighbor. Low on refrigerant.