Hi Randy, Mike & All > For the queen cells, I'm not sure, but as when nearly everything else, if I > don't know any better, I try to duplicate nature. So about 60%RH. I have never measured RH, but I reckon a moist atmosphere is required and a very moist atmosphere does no harm. I like the idea of water bottles to stabilise temperature , which will prolong thermostat life, but I have always used a stainless meat dish with a sponge in it for humidification. My sponge has deteriorated with age ( so have I ) and I am considering replacing it with florist's Oasis material, any comments ?? On a more humorous note, some years ago one of my precocious female Great Grandchildren saw me with the vacuum flask that I use to transport sealed queencells and asked me " are you going to put them in the queen incinerator ? " -- Regards & Best 73s, Dave Cushman, G8MZY http://melliferabees.net Email: [log in to unmask] Short FallBack M/c, Build 7.21/2.01 Son of ORAC M/c, Build 5.o1/2.o1 *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Access BEE-L directly at: http://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=BEE-L