Cold Temperatures

What about hanging insulation in the closet it will keep the colder temps out if your closet is on an outside wall.

mntman36 said:

40 bucks, Walmart propane room radiant heater

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You might want to think about this before you try it. in a enclosed space with this on your not going to wake up because the byproduct of Burning propane is CARBON MONOXIDE. A deadly, colorless, odorless gas that kills.

53F isn't that big of a deal, the soil isn't getting that cold so it should be just fine. It may stunt the growth a TINY bit, but you'll never notice.