Butlr announced today a $20M Series A to scale its people detection sensors with participation from Carrier Global Corporation (a strategic investor), Tiger Global, Primetime Partners, E14, Unionlabs, Hyperplane and Tectonic Ventures.

The startup's sensors keep privacy in mind, and use thermal heat to detect the presence of humans in spaces rather than cameras. “There are various sensing modalities to understand space occupancy and utilization, ranging from the old-school time and utilization studies (i.e., consultants with clipboards and clickers) to using Wi-Fi access points to cameras and more exotic lidar solutions,” said HongHao Deng, Co-founder and CEO of Butlr. “Each sensing modality has its advantages and limitations due to physics. The reason customers are choosing Butlr has to do with privacy, cost of ownership, time to value and flexibility.”

Read full coverage of the fundraise on TechCrunch here.