Skip to content
SaveWave
Sign in

Pass your savings forward.

SaveWave turns what one household saves on energy into the next household's climate action.

Estimate your savingsNot ready? Keep me posted 

One kit, three benefits

  • Lower heating bills

    Well-fitted window film keeps more of the heat you pay for inside, so you burn less fuel.

  • A warmer home

    Less draft around your windows can make it more comfortable to sit near them on cold evenings.

  • Cleaner air

    Burning less fuel means less pollution from heating your home.

How a wave works

  1. Receive

    Someone you know gives you a window-film kit, or you buy one yourself to start a wave.

  2. Save

    SaveWave estimates what the kit saves you. Set part of it aside in your Future Fund, which is virtual: SaveWave never holds your money.

  3. Pay forward

    When your Future Fund passes $25, pay $25 forward to someone you know. Soon you'll both confirm it in the app and see who your gift reached.

Read the whole idea 

How far one wave could go

Each kit can pay for the next. This projection shows what has to happen for a few kits to reach many homes. It is an illustration, not a promise.

ProjectionUnder these assumptions, 8 starting kits would lead to about 65 households with sealed windows.
  • The starting kits
  • One household
  • One round of paying forward, dashed because it is projected
Households in each ring of the projected wave, rounded to whole households
RingHouseholds
Starting households8
Round 1 of paying forward12
Round 2 of paying forward18
Round 3 of paying forward27
All households65
Pay-forwards57

Rows are rounded to whole households, so they may not add up exactly to the total.

The whole wave

Projection
Households
about 65
Pay-forwards per starting kit
about 7
Money, all homes
about $24,000 a year
CO₂, all homes
about 41 t a year

SaveWave's illustrative assumptions

  • 8 households start with a kit.
  • 75% of the people who get a kit pay it forward, 2 kits each.
  • 3 rounds of paying forward.
  • Every home saves like SaveWave's example home in York, Maine, with 8 windows: about $371 and 631 kg of CO₂ a year.
  • The totals are a year's savings once every projected household has its kit. A round is a step of paying forward, not a length of time.

Model interim-artifact-2026-10 and projection-2026-10. How we project

Try your own assumptions 

Two ways to take part

  • Take part now

    Buy a window-film kit, or get one from someone you know. Estimate your savings and save them to your page, and SaveWave shows how soon your Future Fund could pass $25.

    Estimate your savings 

  • Join later

    Not ready this winter? Leave your name, email and ZIP code, and SaveWave will keep you posted.

    Keep me posted