US 12,405,023 B2
HVAC system with indoor air quality monitoring and mitigation
Sanjeev Hingorani, Gainesville, FL (US); Henry Greist, Gainesville, FL (US); Elena Smirnova, Plano, TX (US); Pete Hrejsa, Frisco, TX (US); Emile Abi-Habib, Irving, TX (US); and Dhishan Kande, Dallas, TX (US)
Assigned to Lennox Industries Inc., Richardson, TX (US)
Filed by Lennox Industries Inc., Richardson, TX (US)
Filed on May 11, 2022, as Appl. No. 17/741,968.
Prior Publication US 2023/0366581 A1, Nov. 16, 2023
Int. Cl. F24F 11/74 (2018.01); F24F 11/00 (2018.01); F24F 11/63 (2018.01); F24F 110/66 (2018.01); F24F 110/70 (2018.01)
CPC F24F 11/74 (2018.01) [F24F 11/0001 (2013.01); F24F 11/63 (2018.01); F24F 2110/66 (2018.01); F24F 2110/70 (2018.01)] 17 Claims
OG exemplary drawing
 
1. A heating, ventilation, and air conditioning (HVAC) system configured to provide conditioned air to a space, the HVAC system comprising:
one or more air quality sensors, each air quality sensor configured to measure an air quality; and
a thermostat comprising:
an interface communicatively coupled to the one or more air quality sensors; and
a processor configured to:
receive indoor air quality measurements from the one or more air quality sensors;
determine an indoor air quality score based at least in part on the received indoor air quality measurements;
determine, based at least in part on the indoor air quality score, a mitigation action, wherein the mitigation action comprises: (i) a filtering action comprising filtering air provided to the space using an air purification subsystem, and/or (ii) a ventilation action comprising ventilating the space using a ventilation subsystem;
determine that the mitigation action comprises at least the filtering action by determining that a current indoor air quality is below a quality threshold and that a number of previous attempts to perform the filtering action do not exceed a maximum threshold; and
execute the filtering action by performing a filtering cycle using the air purification subsystem.