KamIe I had similar questions before. What I did when it drops under 70, is just sit in the room until the temp drops under what you prefer, so that way you know how long it takes. Then you can install a timer with a heater in the room. So for my room. After 2 1/2 hours of lights out the temp will drop to under 63 then it kicks on for 4 hours and shuts off, which brings my room temp back up to 76. Since I'm on vacation I'm not able to dial it in completely but it works. Or if your lazy just go to homedepot and buy a plug-in thermostat and you'll be able to plug in a heater and it'll be more accurate then a timer based system. Also if your spraying for mites, you never wanna do it with lights on cause it'll burn em' I've done it lol. Unless it's ment to be used as a foiler with the lights on, most products are pretty specific about that. What I did was add a little bit of my bug killer with my liquid light/ saturator since the product is ment to be used as soon as the lights kick on, that allows me to spray when I need to regardless if lights are on or off.