Measuring temperature

With "some" aid of some fellow chileheads, I'm able to measure and monitor the temperatures in the greenhouse from my room, summerhouse or... anywhere. Just great! :) At the moment I'm measuring the temperatures of the cold side, and separately the floor and the air of the warm side. I'm also measuring the temperature of the incoming water coming from the furnace which is very helpful, I can see when it's time to add more timber in to the furnace! :) I might add some thermostats and remote controls later. This is really getting interesting. I've been always very interested in measuring technics and now it's more useful than ever before! :) This short period of measuring the greenhouse has already taught me a lot how to use the furnace to heat up the greenhouse economically!