Similar situation, forced hot air by gas, but all crawl space under. I just flip the thermostat all the way to the left when leaving after a weekend. It settles down to 48-50, depending on outside temp. I also flip off the pump breaker.
One thing I do have and highly recommend, for peace of mind if nothing else, is a FreezeAlarm. These were promoted by the NHEC a few years back. I got one after a heating system failure cost me a weekend repairing plumbing. Nice. I can dial in and read out things like current temperature, power status, etc. If something goes to trip an alarm, it dials out and alerts me, giving me time to respond before damage is done.
Lowering the inside temp so much does mean that a half day or more is required to bring up the walls and floors to comfort. Forced hot air makes it easier, as the air temp is brought up quickly. You just hear the system cycle on more for those hours. Keep your slippers on.
Why would you think that the crawl space part would chill off more?
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