Why is there a delay when turning on the air conditioner?
When a cooling setting is changed, the thermostat may delay up to five minutes before turning on the air conditioner to protect the compressor. Additionally, there is a built-in time delay on cooling, so you should allow five to ten minutes after changing the setting before the air conditioner starts.
From the official Honeywell CT3355 Home Programmable Thermostat manual, page 28
Have a follow-up question?
Answers from the official manual.
Common questions