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Dear Oliver, 
  I have started to control optomechanics with servos for robotics 
applications. Whenever the specifications are sufficient for the applications, 
we save a lot of money.

Our controllers was equipped with a sensor for temperature and humidity:

http://www.active-robots.com/sensors/temperature-humidity/phidgets-
humidity-temperature-sensor.html

I did not use it, but I see there is also a sensor for CO2:

http://www.active-robots.com/sensors/gas/co2-carbon-dioxide-gas-sensor-
module.html

I am intereted in it and I am going to buy one in the future. I would discourage 
to buy these for H&S as they would not be certified, but for monitoring the 
status of the microscope should be sufficient.

Our GUI to control our multi-modal two-photon microscope triggers a warning 
when the temperature of the room drift of more than 2 degrees over the 
course of one experiment. 

With these + controllers and little VB programing you can have what you wish 
for very little money (if specs suffice for your applications).

Cheers, 

Alessandro