additionally, keep doors open to unused rooms or areas and keep the heat on 55 degrees. If you have pipes in the ceiling, be very careful. They can easily freeze and flood your home. You might consider heat tape for these pipes. this applies to any pipes in crawl spaces, etc. Don't forget to drain your automatic sprinkler system. If you have tenants, don't assume they will disconnect hoses, etc. visit your home/investment to insure it is protected.