Guides / Inside the house
Energy efficiency
Energy efficiency is mostly about stopping conditioned air from leaking out and outside air from getting in. Start with the cheap fixes before thinking about big upgrades.
What to check
- Drafts
- On a windy day, hold your hand or a lit incense stick near window frames, outlets on exterior walls, and attic hatches to find drafts.
- Weatherstripping
- Replace worn weatherstripping on doors and windows. Add a door sweep where you see daylight under an exterior door.
- Attic insulation
- Look at insulation depth in the attic. If you can easily see the tops of the floor joists, there may be room to add more.
- Lighting
- Switch remaining incandescent bulbs to LEDs, starting with the lights you use most.
- Water heater setting
- Many households are comfortable with a water heater set around 120°F, which also reduces scald risk.
- Utility programs
- Check your utility's website for free or discounted home energy audits and rebates.
When to do it
Hunt for drafts in fall before heating season. Review bills seasonally to spot unusual jumps.
Call a licensed professional for
- A professional energy audit with a blower door test
- Adding insulation where there is old wiring, moisture, or vermiculite that may contain asbestos
- Replacing windows, HVAC systems or water heaters
This guide is general information for US homeowners. Codes, climates and houses vary. It is not a substitute for an inspection or advice from a licensed contractor, and in an emergency call 911.