Hot peppers like habenera peppers work great, take a few (4-5) peppers, and grind the shit out of them, grind up the seeds too. Put the pulp in some water, and simmer on LOW heat (low is key here) this will help release capsasin (the hotness of the peppers) into the water. DO NOT BOIL this will lose the capsasin. simmer for about 20 minutes or so, then strain your water, to lose the pulp, and spray directly on your plants. bugs hate the hotness of it.
a little dawn dishsoap works the same. a few drops of dawn and some water, and you'll have the cleanest, bug free plants ever!
and for your temp. problem, I think it depends on how your plant is, and where the genetics originated. a friend of mine had a mulanje gold that flowered in below 32 degree weather (it wasn't 32 degrees the whole time, just over the winter the temps dropped pretty low) his big bud almost bit the dust, MG barely batted an eye. my night temps are around 40-50, sometimes a bit higher, the worst its doing is making one of my afghans turn purple, which is not a bad thing, most weed will turn colours, mostly purpleish when the temps get too low, some growers take advantage of that to get purple weed (more bag appeal maybe?)