carsNskis
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Here's a wireless temp sensor set up, may help lead to a cheap arduino based solution to test your vents if you don't already know of them...
Sensors
https://www.amazon.com/gp/aw/cr/B010O1G1ES/ref=mw_dp_cr
Repository for build
https://github.com/horack/esp8266_arduino_temperature_nodes
Sensors
https://www.amazon.com/gp/aw/cr/B010O1G1ES/ref=mw_dp_cr
Repository for build
https://github.com/horack/esp8266_arduino_temperature_nodes