Internal Inspections:

Inspect doors, windows, ceilings, walls and floors throughout home for damage, water leaks, mold or signs of pest infestation
Verify air conditioner/heater is maintaining desired temperature
Measure and record humidity level
Ensure all timers are set properly
Check appliances. Run dishwasher, garbage disposal, and washing machine checking for leaks and assessing seal integrity
Check interior lights
Check internal water connection points (faucets, toilets). Ensure no issues, leaks, P-traps functioning properly and flush all toilets
Investigate irregular odors, alarms, or noises
Check breaker panel
Verify security system is functioning properly upon entry/exit
Reset appliances, timers, clocks, breakers (if needed) should a power outage occur
Verify garage doors open/close properly
Check water softener/water heater functionality (if left on and applicable)
Ensure WiFi connections are functioning properly

Walk perimeter of property/residence looking for signs of vandalism, forced entry, squatters, weather damage etc…
Remove all signs of home being unoccupied including, but not limited to, mail, flyers, debris, etc.
Ensure exterior lighting is working properly
Visually inspect roof, gutters from ground level
Verify that service providers are meeting expectations (lawn, pool etc)
Check external spigots/faucets/hose bibs for leaks or damage
Inspect general conditions including landscaping, plants, trees.