I had similar problem.... My room in winter sometimes drops to 70-72 degrees.. i bought RBI 32 qt rack with 4"belly heat option.. I have Accu-rRite thermometer with probe in every tub..
Sometimes in winter I need to crank my thermostat to 107 degrees to keep hot spot 88-90 degrees and cold 76-78... i have only 2 BP so checking temp before i go to work and after work everyday is not a big problem for me.. It could be done.. but it's connected to constant checking temp in tubs everyday or even 2x a day...