See wd austria humidifier, maybe will help you.

Good luck,

Regards 

Temperature and humidity controls are probably the most important factors in the

successful rearing of mosquitoes. The simplest method of providing regulated heat

and humidity is the use of a small electric light bulb and a wet towel draped over

the cage. Th e most elaborate is a complex environmental chamber with programmed

electronic controls of temperature, humidity, and photoperiod. The size of the

insectary will regulate the type of temperature and humidity control system required. Temperature and humidity controls are probably the most important factors in the

successful rearing of mosquitoes. The simplest method of providing regulated heat

and humidity is the use of a small electric light bulb and a wet towel draped over

the cage. Th e most elaborate is a complex environmental chamber with programmed

electronic controls of temperature, humidity, and photoperiod. The size of the

insectary will regulate the type of temperature and humidity control system required.  If a source of clean compressed air is available, the air supply and water

supply can be connected and regulated by solenoids and humidistats. The water is

forced out through fine nozzles installed in a hose and produces a fine mist. Steam

units are available which will provide warm moisture. 

I have a domestic 5 litres ultrassonic humidifier with analogic botton plugged in a power source controlled by a humidistat, in a 6 m2 rearing room. I adjust to turn on the equipment when the humidity is below 60%, and turn off above 75%. I change the water once a week, and still working fine on the last 4 years. Note: I use destlled esterilized water. 

thanks Rogerio. Can you tell me the brand of your humidifier?

Best