If your Nest thermostat takes an unusually long time to cool down your home, the delay is typically caused by restricted HVAC airflow (such as a clogged air filter or blocked return vents), low refrigerant levels in your air conditioner, or conservative temperature staging settings on the thermostat. Additionally, if the Nest is configured with conservative early-recovery algorithms, it modulates cooling gradually to reach target temperatures efficiently. Verification: Check your air filter and use a thermometer at the supply vent to verify that the AC is blowing air at least 15 to 20 degrees cooler than ambient indoor air.
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