Weatherization Payback Calculator

Find how fast insulation, air sealing or weatherstripping pays back from its cost and yearly savings, with 10-year net savings and ROI. Calculates in your browser.

Payback period

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10-year net savings-
10-year ROI-

Show the math

Payback is the upfront cost divided by the yearly saving it delivers:

payback = cost ÷ annual savings

10-yr net = savings × 10 − cost

Weatherization (air sealing, insulation, weatherstripping) keeps saving year after year, so the longer the horizon the better the return. All math runs in your browser.

What this does

A weatherization payback calculator shows how fast insulation, air sealing, or weatherstripping pays back from its cost and yearly savings, with 10-year net savings and ROI.

How to use it

  1. Enter the project cost.
  2. Enter the annual energy saving.
  3. Read the payback years.
  4. See the 10-year net savings.

How it works

Air sealing, insulation, and weatherstripping cut heating and cooling losses and keep saving year after year.

payback = cost ÷ annual saving; 10-yr net = saving × 10 − cost

Understanding your result

These measures usually pay back fast and then keep saving year after year, which is why they often beat flashier upgrades on return. Start with the cheapest wins, air sealing and weatherstripping, before bigger insulation jobs, and remember the saving comes with a comfort gain, fewer draughts and steadier temperatures, that the payback figure alone does not capture.

Example

A $1,200 job saving $300 a year pays back in 4 years.

Sources & methodology

Last updated .

Frequently asked questions

How is weatherization payback calculated?

Divide the project cost by the annual energy saving it delivers. The 10-year net is savings \u00d7 10 minus the cost.

What counts as weatherization?

Air sealing, insulation and weatherstripping \u2014 measures that cut heating and cooling losses and keep saving year after year.

Is my data stored?

No. Everything is calculated locally in your browser.