Ok, I ordered bunch of stuff from ReptileSupply and 2 thermostats from LLLreptiles (which delivered in 1.5 days after ordering. how crazy was that)

So as of now I already have the 2 Alife thermostats. Still waiting for my UTHs and other stuff I ordered. The problem is that right now I can't regulate the heat on both sides so I tried to bump the temp up to 92-94 on the warm side but it's not working. I just have Fluker's clamp lamp with a 75 watt light bulb heating the tank right now. Before I plugged the thermostat in, my old thermometer(stick on one) always showed 90ish, but the new Acurite digital one shows 82-83 all the time. So i set the temp to 95 on the thermostat but the temp hasn't gone up much. It still fluctuates between 84-85. Am I doing something wrong? Does it take a while for the thermostat to kick in? How accurate are Acurite digital thermometers? Do I have to cover the top screen of my vivarium(its glass tank)