Comments about Temperature Recorder:
I built a cabin last fall with a crawl space. I was concerned that the crawl space could freeze and cause my water pipes to freeze. I purchased a temperature recorder and software from QC Supply. I programmed the data recorder which took less than 5 minutes and was extremely easy. I placed the data recorder in the crawl space all winter and it recorder temps all season and it showed me that the temp never got below 40. No need for extra heat.