Energy Efficiency at Home


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For home electrificatio​n information, please visit our Home Electrification page.

You can learn more about how Ann Arborites are improving their homes' efficiency on our Sustainability Stories ​webpage, which showcases first-hand accounts from Ann Arbor residents making moves in the sustainability space.​​

Whether you live alone or in a shared house, in a single family home or in a multi-unit complex, o​​wn or rent, this page provides information about bringing energy - and water - efficiency into your home. 

Efficient homes are not only better for the planet, but offe​r the ​opportunity for great cost savings and health improvements.​​ On this page, you can learn more about: 

​A2ZERO Home Energy Advisor

​​​​​Want to do more around your home, but don't know where to start? The A2ZERO Home Energy Advisor​ (HEA) may be just what you're looking for! The HEA is a free service open to all Ann Arbor residents, homeowners and renters alike.  It provides free home energy assessments, answers to your questions, custom home decarbonization plans, contractor connections, identification of rebates and incentives, and project coaching.  

​​Energy Efficiency

Improving the energy efficiency ​of your home can bring substantial benefits. Sealing your home can improve comfort by eliminating drafts in the winter and mugginess in the summer. Energy efficiency upgrades can also improve the resale value of your home, while saving you money on your energy bills. Finally, lowering your energy usage reduces greenhouse gas emissions and can improve indoor air quality, comfort, health, and safety. ​

​How to Save Energy and Money

There are many options for improving the energy efficiency of your home. We have compiled a list of the top 5 ways to save money and energy:

  1. Find and seal air leaks
    Air leakages into and out of your home can account for 30% of a home's heating and cooling costs; that's a lot of wasted money. According to ENERGY STAR, sealing and insulating the “envelope" or “shell" of your home – its outer walls, ceiling, windows, doors, and floors – is often the most cost-effective way to improve energy efficiency and comfort.
  2. Insulate the attic and basement
    Insulation prevents the transfer of heat between your house and the outside. This keeps heat in during the winter and prevents cold drafts. And during the summer months it keeps out the humidity, keeping in the cool air generated by your AC unit. 
  3. Upgrade heating and cooling appliances
    More than half of the energy used in your home likely comes from heating and cooling, which makes it important to tackle if you'd like to save energy and reduce your utility bills. Replacing your old heating furnace with modern 95% efficient units can save 10-15% on your heating costs. If your central air conditioner is more than 12 years old, replacing it with one that is Energy Star qualified can reduce your cooling costs by 30%. And even better, explore a heat pump to go all electric! ​
  4. Replace appliances with EnergyStar appliances
    Since 1990, the efficiency of refrigerators has improved by over 60%, dishwashers by over 50%, and laundry machines by  over 75%. This can translate to hundreds of dollars in energy savings per year. 
  5. Switch to LED lighting
    Switching your incandescent or compact florescent lamp (CFL) bulbs to LEDs can save up to 85% of lighting costs and last as long as 25 years.
For more ideas and information, check out these EnergySaver​ tips from the DOE.​ And, check out this video on how to do an energy​ efficiency retrofit walkthrough of your home:


​Finding a Contractor

Many improvements are best left to professionals who are certified, have the proper tools, conduct tests before and after renovation, and can obtain the right rebates and incentives. Home energy professionals can become your trusted partners in an energy efficiency renovation project, and helping their customers achieve long-term energy savings with their projects. Check out Michigan Saves to find a qualified contractor.

Also check​ out the Washtenaw County's Weatherization Assistance Program​, which provides free weatherization services to qualified Washtenaw County residents. 

Home Energy​ Assessments​

In many cases, the first step contractors will take is to perform a home energy assessment (often called an “energy audit"), which will identify the top priorities for reducing your home's energy use. A certified energy auditor can examine your home's insulation, air tightness, heating/cooling systems and other sources of energy consumption. The energy auditor can perform diagnostic testing to determine the best ways to upgrade your home's energy performance and provide guidance on taking a whole-house approach. Check out Mich​igan Saves or DTE to find details about getting an energy audit. 

Looking for even more ways to make your home maximally efficient? Check out the Department of Energy's Energy Efficiency Home Design. ​

Water Efficiency

85% of our drinking water comes from the Huron River. Ann Arbor's Water Treatment Plant treats and distributes 28 million gallons per day of local surface and groundwater for businesses and residents. All that water is then treated at the Wastewater Plant and returned to the Huron River. The urban forest and stormwater conveyance systems play a critical role in managing stormwater and improving water quality.

What can you do?

In the Bathroom

  • Take shorter showers.
  • Draw less water for baths.
  • Don't use the toilet as a trash can: tissues, cotton balls, etc., should be thrown in the garbage, not flushed.
  • Turn off water while brushing teeth.
  • Fix a leaky faucet.

In the Kitchen or Laundry

  • Only run the dishwasher for full loads.
  • Don't let the faucet run to get a cold drink, keep a pitcher of water in the refrigerator instead.
  • Only run the washing machine for a full load of clothes.
  • Wash clothes in cold water (more of an energy saving tip).


  • Only water the lawn and garden when it needs it. One inch of water every 10 days keeps lawns healthy and green. Water at cooler times like at night or early in the morning to prevent evaporation.
  • Cut the grass at least 3 inches high to shade the roots, so that it will be more drought tolerant and won't need to be watered as often.
  • When washing your car or your bicycle, use a bucket and a hose with a nozzle so that water isn't running all the time.
  • Sweep the driveway and sidewalk with a broom rather than using a hose. ​

A2ZERO Green Rental Housing

Over 50% of all housing units in Ann Arbor are rentals. This means that efforts to reduce our energy consumption and achieve carbon neutrality need to​ have a strong focus on improving the efficiency of our rental stock. That is why Ann Arbor is launching a Green Rental Efficiency Initiative. This program aims to add energy efficiency requirements into the existing City rental licensing process, thereby ensuring that every rental unit in Ann Arbor meets a minimum energy efficiency and safety performance standard. Trainings, rebates, and financing support are also being created to aid the transition to greater efficiency in our rental units. Learn more about Green Rental Housing​.

A2ZERO Home Energy Rating Disclosure

The Home Energy Rating Disclosure (HERD) Ordinance provides consumer protections for home buyers by helping them understand the energy efficiency of the homes on the market in Ann Arbor. This is accomplished by requiring a simple Home Energy Score (HES) assessment to be conducted before the home lists for sale. HERD makes a home's energy use easy to understand, like a miles-per-gallon/charge rating for a vehicle. Learn more about HERD​.

Aging in Place Efficiently

The Aging​ in Place Efficiently program helps low-income seniors age in a place of their choosing for longer by providing physical and energy efficiency improvements to their residences. More specifically, this program combines energy efficiency improvements into a wide variety of existing services available to help seniors age in place. Grants funds are available to support physical improvements in at least 25 senior homes. Individuals interested in learning more or joining the program should email Jennifer Wolf​.

​10,000 Trees Initiative​

Interested in greening your yard and making your home more sustainable by planting a tree? Trees can improve your home's energy efficiency by providing shade in the hot summer months and by blocking wind in the cold winter months. Check out our 10,000 Trees Initiative to see how you can get trees for your property!​