Check central air-conditioning units according to the manufacturer's recommendations.
Replace filters in forced-air systems. Clean debris from outside condensers or heat pump units.
Reset thermostats and automatic sprinkler systems.
Wash windows, inside and out (try a solution of three tablespoons non-sudsy ammonia to a gallon of water). To prevent streaking, don't work in direct sunlight.
Clean and inspect gutters. Ensure clips, straps and spikes are tight. Flush debris from downspouts with hose. Make sure downspouts and splash blocks direct water at least three feet away from the foundation.
Clean mineral deposits from faucet aerators and shower heads by soaking parts in white vinegar and scrubbing with an old toothbrush.
Dust ceiling fan blades.
Coat outdoor metal patio furniture with auto polish.
If appropriate, have swimming pools cleaned. Inspect and service pool liners and filters