Invest in a thermoSTAT (note: a thermometer measures temps a thermostat controls temps).
The best you can afford. (personally I would suggest either Herpstat or Vivarium Electronics although others swear Helix is reliable and even Hydrofarm is better than nothing)
Eliminate drafts in the room and yes, insulation will help keep the heating cost down. My concern is that you are having issues as the ambient temp changes, That tells me your set up is likely running at its' max which is not where you want to be. The max or even less should still have enough output to maintain optimum temps in the worst conditions you expect to experience and the thermostat idles the output back to keep the temps ideal for you in warmer months.
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