Big home-energy projects (insulation, duct sealing, equipment upgrades) get most of the press. In our experience, most homes save more from a handful of habits than from any single project. Here is the list, ordered by impact.
1. Set a smart thermostat schedule
78°F home, 82°F away, 76°F overnight if you need it cool to sleep. The DOE estimates 1 percent saved per degree of setback per 8 hours. A smart thermostat ($200 to $300 installed) does this for you and pays back in 12 to 24 months. A free schedule on a programmable thermostat works almost as well.
2. Change the air filter
Every 30 to 90 days. Filter type matters, and so do pets. A loaded filter cuts airflow 20 to 40 percent, so the system runs longer and the coil can freeze. Your bill goes up. Set a phone reminder on the first of every month.
3. Lower the water heater to 120°F
Most installers leave water heaters at 130 to 140°F. Lowering to 120°F cuts standby losses about 4 to 5 percent of the total electric bill. Free to do; takes 5 minutes.
4. Switch the rest of the bulbs to LED
If you still have incandescents in closets or older fixtures, swap them. They run $3 to $8 per bulb and use 75 percent less energy. They also add less heat to the house in summer. Pays back in 12 to 18 months per bulb.
5. Air seal the attic
Plumbing and electrical penetrations leak conditioned air upward all day, and so do can lights and the attic access door. $300 to $800 to do thoroughly with foam and weatherstripping. 5 to 15 percent savings.
6. Run ceiling fans only when in the room
Fans cool skin, not rooms. The wind chill effect lets you set the thermostat 2 to 4°F higher with the same comfort while you are in the room. Empty rooms do not benefit; the motor adds a tiny amount of heat.
7. Use cold-water laundry and full loads only
About 90 percent of a washing machine's energy goes to heating water. Cold-water washing handles modern detergents fine. Full loads are 30 to 50 percent more efficient than partial loads.
8. Run the dryer in the evening
The dryer dumps heat and humidity into the house. Running it after 7 PM (cooler outdoor temps, lower AC load) shifts that load to a less-expensive time of day. Better yet, hang heavier items.
9. Unplug the obvious phantom loads
Old plasma TVs and gaming consoles in standby draw power 24/7. So does the garage refrigerator that holds beer once a year, and the second printer, and the modem on the spare-bedroom desk. A smart power strip on the entertainment center handles most of it. The mostly-empty garage fridge is its own line item; it is often $100 to $200 a year by itself.
10. Get an annual HVAC tune-up
$99 flat. A tuned system runs 5 to 15 percent more efficient than a neglected one. On a $1,500 cooling bill, that is $75 to $225 right back. Plus it catches small problems before they turn into emergency calls in August.
What does not actually save much
- "Energy saver" boxes you plug into outlets. Independent testing has not shown meaningful savings.
- Closing supply registers in unused rooms (raises duct static pressure; counterproductive).
- Fan in "on" mode 24/7 in a humid climate (re-evaporates moisture off the coil into the house). Use "auto."
- Replacing a working 8-year-old AC just for efficiency. Math rarely pencils out unless it is also failing.
The whole list, on a fridge magnet
- 78 home / 82 away
- Filter every 30 to 90 days
- Water heater at 120°F
- LED bulbs only
- Air seal the attic
- Fans on only when present
- Cold-water full loads
- Dryer after 7 PM
- Kill phantom loads
- Tune-up once a year
Print the fridge list, then hand number 10 to us. Tune-ups start at $99; 281-992-7866 or book online.