To winterize is to prepare a property or system for expected cold-weather conditions and any planned period of reduced use.
What this means at your property
For a Houston-area property, preparation may involve exposed plumbing, known leaks and arrangements for an interruption to normal services. A vacant building and an occupied home can need different plans, so the work should reflect actual use.
What should be discussed before a freeze?
Identify vulnerable systems, the person responsible for specialist service and where current equipment instructions are kept. Review unresolved repairs and access needs early; do not improvise changes to fuel-burning equipment or plumbing systems during an emergency.