If your house is for sale in summer, run the air conditioner. If it's 90 degrees inside, buyers will pay more attention to the temperature than to the attractive features of the house.
When not in use, keep your work ladders locked up so that burglars cannot use them to break into your house through the upper floors.
A 4-ft. T-square for drywalling can come in handy for other projects. Besides being helpful in drywalling, it can be useful when laying out patterns or cutting on full sheets of plywood or particle board. The square is accurate, stable and will give you a full 48-in. straight line. Some newer versions come with a head that can be adjusted to various angles, then clamped in place.
Many of your questions should focus on potential problems and maintenance issues. Does anything need to be replaced? What things require ongoing maintenance (e.g., paint, roof, HVAC, appliances, carpet)? Also ask about the house and neighborhood, focusing on quality of life issues. Be sure the seller's or real estate agent's answers are clear and complete. Ask questions until you understand all of the information they've given. Making a list of questions ahead of time will help you organize your thoughts and arrange all of the information you receive.