What is the temperature limit for operating the cooling system safely?
Do not operate the cooling system when the outdoor temperature is below 50°F (10°C). Operating the cooling system in temperatures below this threshold can cause possible compressor damage. (Page 4)
From the official Honeywell TH5220D1029 Thermostat manual, page 4
Have a follow-up question?
Answers from the official manual.
Common questions