Use caulk to seal around the edges of the outside of every window in your house. You may need to remove the old caulk first. Seal your doors by nailing weather stripping around the inside of the door frame and attaching a door sweep at the bottom. Don’t bother with sealing tape – it will just crack and peel off. Wrap a water heater jacket around your heater. Make sure you don’t block the overflow spigot or other critical components.
Replace your lights with CFLs – or even better, LEDs. Replace your furnace filter every 3 – 6 months. Check the manufacturer’s recommendations. Rake leaves so they don’t smother your grass. Mow and aerate your lawn so new growth can thrive. Clean your gutters and downspouts to keep icicles from forming. Bring in your hose and drain your sprinkler system to keep pipes from bursting. Sweep your driveways and walkways to look for cracks. Seal them so excess water won’t pool.
Invest in a programmable thermostat and set it to your schedule. Install leaf guards on your gutters to protect them from debris. Check your smoke and carbon monoxide detectors. The US Fire Administration recommends you install smoke detectors both inside and outside sleeping areas. Place carbon monoxide detectors near sleeping areas and potential hazards – like appliances that burn gas. Consider converting your toilet to a low flow toilet. Place a filled half gallon container in your toilet’s tank.