46 degrees is the magic low temp, anything lower and you get condesation and rust starts. I keep my garage at 46-9 degrees and it heats up to 65 in about an hr if it is really cold out.
I am going to be spending more money on insulation and it will probably pay me back for it by the end of the season. I am currently doing a study of my heating cost and my house is isolated from the cost of the gas for the garage and I am trying an Edenpure heater in the house. The damn little thing is doing really well. At 5 degrees outside I can be at 63 degrees in the house. I would never have believed it would do so good or my house was that well insulated. I always thought the garage used a lot less.
I am with Greg, just keep the heater warmer. I say spend any ,more money on insulation and you will be happier with both a warmer garage and a lower bill.
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