Save energy

LES energy-efficient home

Make yourself at home! Use the navigation buttons below to explore each area of your home to uncover eco-friendly tips, information and videos on how to help make your home more energy-efficient.

Exterior
mobile interactive home full house
Exterior Items
Fireplaces

To ensure the most efficient operation of your fireplace, install tempered glass doors and a heat-air exchange system that blows warmed air back into the room, and close the damper when it is not in use.

Roof/Attic ventilation

Attic ventilation is required for moisture removal during the winter months and heat removal during the summer months. Proper ventilation sizing requires 1/150th of the square footage of attic area, half in high roof and half in soffits.

Windows/Glass doors

Learn more about ENERGY STAR® windows, doors and skylights.

Minimum
U-Factor .35 or less, proper flashing and slope drainage

Better
U-Factor .30 or less, Low “E” coating, gas filled, proper flashing and slope drainage

Best
Triple-pane glass, Low “E” coating, gas filled, proper flashing and slope drainage

Air conditioner/Heat pump/Furnace

ENERGY STAR® heat pumps and air conditioners have higher seasonal energy efficiency ratio (SEER) and energy efficiency ratio (EER) ratings, as well as a higher heating seasonal performance factor (HSPF) than standard models, making them about 9 percent more efficient than standard new models and 20 percent more efficient than what you may have in your home.

Geothermal heat pumps are over 45 percent more energy efficient than standard options. 

Read about LES' Sustainable Energy Program incentives.

Minimum
Furnace with standard 13 SEER central air conditioner or 8 HSPF heat pump

Better
16 SEER, 9 HSPF air source heat pump with variable speed air handler or 90 percent annual fuel utilization efficiency sealed combustion fossil fuel furnace with variable speed blower

Best
Variable capacity geothermal heat pump

NOTE: Proper sizing required, Manual J sizing worksheet or equivalent in all applications

Trees

Strategically planting deciduous trees near south-, east- and west-facing windows will provide needed shade in the summer but let in the sun's heat during the winter.

Solar electric or photovoltaic systems

A solar electric or photovoltaic system uses solar cells to capture the sun's rays and convert that energy into electricity. Such systems allow homeowners to generate electricity in a clean, reliable and quiet way that can offset the cost of future electricity costs and decrease their dependence on the energy grid.

Read about LES solar and customer-owned generation.

LES customers have several ways to invest in solar, including installing your own, purchasing “virtual” panels at your local community solar facility, or making a monthly donation benefiting community solar. Visit our solar page.

 

Ceiling areas
mobile interactive home roof cutout
Ceiling areas
Ventilation

Learn more about ventilation systems.

Minimum
Bath fans that meet American Society of Heating, Refrigerating and Air-Conditioning Engineers 62.2

Better
Exhaust or supply-only ventilation low sone (sound) rating and that meet performance criteria of the bathroom’s required exhaust

Best
Source point whole-house ventilation with a heat recovery ventilator or energy recovery ventilator

NOTE: All ventilation must meet ASHRAE 62.2.

Lighting

LES recommends LED lighting for maximum energy efficiency. Certified ENERGY STAR® LED light bulbs use about 70-90 percent less energy than traditional incandescent bulbs and last 10-25 times longer, saving $30 to $80 in electricity costs over their lifetime. They produce about 70-90 percent less heat so are safer to operate and can cut energy costs associated with home cooling.

Minimum
High-efficiency lighting in at least 50 percent of the permanently installed light fixtures – LEDs

Better
High-efficiency lighting in at least 75 percent of the permanently installed light fixtures – LEDs

Best
High-efficiency lighting in at least 75 percent of the permanently installed light fixtures – LEDs, motion-sensing LEDs, advanced sealing of any penetrations in envelope used for lighting

Insulation

Read a do-it-yourself guide to sealing and insulating.

Minimum
R-38 blown insulation with insulation contact airtight recessed can lights sealing all penetrations

Better
R-45 blown insulation with insulation contact airtight recessed can lights, use of energy trusses, advanced sealing of all penetrations from living space into unconditioned areas

Best
R-60 blown insulation with insulation contact airtight recessed can lights, use of energy trusses, advanced sealing all penetrations from living space into unconditioned areas

Read more about LES' Sustainable Energy Program.

 

Interior
mobile interactive home walls
Interior Items
Ductwork

Minimum
All ducts, air handlers, filter boxes and building cavities used as ducts should be sealed and if any ductwork is outside of conditioned space, insulated R-8 supply, R-6 for all others and duct leakage test

Better
Combination of sealing mastic and UL181 foil tape. Supply and return duct systems should be within the confines of conditioned space with little or no flex duct.

Best
All ductwork, supply and return hard ducted and sealed; supply and return duct systems should be within the confines of conditioned space with little or no flex duct; tested for air leakage; sized correctly and balanced

NOTE: Proper fabrication/sizing according to Manual D sizing worksheet or equivalent in all applications

Stud Walls

Minimum
2'x6' walls with R-20 cavity insulation or 2'x4' wall with R-13 cavity with R-5 continuous insulation

Better
2'x6' walls with R-20 cavity-blown insulation and R-5 insulating sheathing

Best
2'x6' walls with R-20 cavity-blown insulation and R-10 insulating sheathing with optimum value engineered framing, 24” on center insulated headers, ladder blocking, two stud corners

Electrical

Electrical and utility penetrations in exterior walls or through the ceiling should be sealed with airtight construction practices. Recessed lighting fixtures that extend into unconditioned areas include airtight enclosures, while electrical outlets and switches on exterior walls and ceiling light fixtures should be airtight.

 

Plumbing

Plumbing penetrations in exterior walls or through the ceiling should be sealed with airtight construction practices.

 

Home electronics

ENERGY STAR® certified audio/video equipment is up to 60 percent more efficient than conventional models. If each TV, DVD and home theater system purchased in the U.S. this year earned the ENERGY STAR, we would prevent more than 2.2 billion pounds of greenhouse gas emissions every year, equal to the emissions from more than 200,000 cars.

Blinds/Shades

During cold weather, take advantage of the sun's warmth by keeping drapes open on south-facing windows during daylight hours. Close shades and drapes after the sun goes down to help improve insulation and prevent heat loss. In the heat of the summer sun, close window shades and drapes.

Thermostats

programmable thermostat helps you save energy and reduce greenhouse gas emissions that contribute to global warming. Give it a try, keeping in mind that setting temperatures up or down when you are away or asleep is an easy way to save energy and money without sacrificing comfort.

Learn about LES Peak Rewards and the rewards available to you when you enroll your thermostat in the program.

 

Basement
mobile interactive home basement
Basement Items
Basement concrete walls

Learn about basement air sealing and insulating.

Minimum
8" concrete walls with R-10 continuous or R-13 cavity with standard below-grade waterproofing system

Better
8" concrete walls with R-13 insulation and minimum R-5 continuous interior or exterior foam insulation with waterproofing membrane

Best
8" concrete walls with R-13 insulation and minimum R-10 continuous interior or exterior foam insulation with hydroscopic waterproofing system

 

Sill-box/Band joist area

Learn about sealing air leaks in your basement.

Minimum
R-20 cavity insulation or R-13 cavity with R-5 continuous insulation

Better
R-20 cavity insulation or R-13 cavity with R-5 continuous insulation and airtight sealing (gaskets, caulking or foams)

Best
R-20 spray foam

Water heaters

Minimum
Standard storage electric or fossil fuel water heater

Better
Heat pump or high-efficient fossil fuel sealed-combustion water heater

Best
Water heater with geothermal heat pump applications

Furnace filter

Check your furnace filter every month, especially during heavy-use months (winter and summer). If the filter looks dirty after a month, change it.

 

Basement floor
mobile interactive home basement floor
Basement floor
Basement floor

Minimum
4" concrete floor

Better
4" concrete floor with drain tile and sump pit, minimum 6-millimeter poly with taped seams

Best
4" concrete floor, exterior/interior drain tile sealed radon mitigation sump pit system, 4"-6" of aggregate, minimum R-10 XPS (under-slab) insulation on all edges and beneath entire floor area, 6-millimeter high-density poly with taped seams

Slab or grade (including walkout basements)

Minimum
4" concrete floor; R-10 insulation from slab edge 2' vertical or 2' horizontal – on all sides

Better
4" concrete floor, R-10 insulation on all slab edges and beneath entire floor area, minimum 6-millimeter poly with taped seams

Best
4" concrete floor, 4"-6" of aggregate, minimum R-10 XPS (under-slab) insulation on all edges and beneath entire floor area, 6-millimeter high-density poly with taped seams

Floors over unconditioned space (including cantilevered floors)

Learn more about basement air sealing and insulating.

Minimum
R-30 cavity insulation with subfloor contact or full cavity insulation minimum R-19

Better
R-30 cavity-blown insulation with contact on all six sides and R-5 insulating sheathing

Best
R-30 cavity-blown insulation with contact on all six sides, R-10 insulating sheathing and airtight sealing

Energy-saving tips

Looking for ways to save when seasons change or when you're not at home? Check out these tips we've gathered just for you! Find more ways you can save energy and money by subscribing to em • Powered™ and EnergyLine newsletters.

thermostat

If using a portable space heater, turn down the central heating thermostat to offset the energy being consumed by the space heater.

fireplace

Keep the fireplace damper closed unless in use. An open damper can be compared to keeping a 48-inch window wide open during the winter. Close the damper as soon as you are certain the fire is completely out.

yellow, beige, and grey knitted sweaters

Warm clothes can be the best insulation of all. A light, long-sleeved sweater equals almost 2 degrees in added warmth; a heavy sweater adds 4 degrees.

window in bedroom looking outside

Keep windows tightly latched. Latching generally reduces air leakage through gaps around window sashes.

window blinds

Open shades and drapes on sunny sides of your home or apartment during daytime hours. Close them at night.