HVAC Air Quality Sensors Renesas Electronics HVAC Air Quality Sensors include the ZMOD4410 gas sensor and HS300x humidity sensor family and the RL78/G14 microcontroller. This provides a complete solution for HVAC systems, smart appliances, and smart home/office applications. These applications meet strict air quality regulations, save energy, and help to maintain health and wellness. Power and timing solutions are also available to complete these solutions.