A green mortgage (also called an energy-efficient mortgage or EEM) lets you borrow additional money to pay for energy improvements, with the premise that utility savings offset the higher payment. Programs include FHA EEM, VA EEM, and Freddie Mac GreenCHOICE. This calculator shows the net monthly benefit.
Mortgage & Improvement Details
Solar, heat pump, insulation, windows, etc.
From energy audit or installer estimate
Green Mortgage Program Comparison
| Program | Limit | Notes |
|---|---|---|
| FHA EEM | $8,000 or 5% | FHA loans; requires energy assessor; cost-effectiveness test |
| VA EEM | $6,000 | Veterans only; no additional appraisal for improvements under $3,000 |
| Freddie Mac GreenCHOICE | 15% of value | Conventional; one unit to 4-unit; broader improvement list |
| Fannie Mae HomeStyle Energy | 15% of value | Conventional; includes resiliency improvements; energy auditor optional |
How to Use the Green Mortgage Savings Calculator
Energy-efficient mortgages are an underused tool for financing home improvements. Rather than taking a separate home equity loan at a higher rate, a green mortgage bundles energy improvements into your primary mortgage at a lower rate. The key question is whether utility savings exceed the higher payment — this calculator answers that.
Step 1: Choose your mortgage program
FHA EEM caps at $8,000 or 5% of appraised value (whichever is less) — useful for smaller improvements. Freddie Mac GreenCHOICE and Fannie Mae HomeStyle Energy go up to 15% of appraised value — on a $350,000 home, that's up to $52,500 for improvements. VA EEM caps at $6,000 but requires no additional appraisal for small improvements.
Step 2: Enter improvement cost and expected savings
The improvement cost should come from contractor quotes. Expected utility savings should come from an energy audit or installer estimates — installers for solar, heat pumps, and insulation routinely provide these. On a typical home, a $15,000 solar installation saves $1,200–$2,400/year depending on electricity rates and roof orientation.
Step 3: Review the net monthly benefit
The net monthly benefit is your monthly utility savings minus the monthly mortgage payment increase. If this number is positive from day one, the green mortgage is a financial win with no break-even period. If negative, you're paying more monthly now but building equity in a more valuable, energy-efficient home.
Frequently Asked Questions
Is this green mortgage calculator free?
Yes, completely free with no account required.
Is my data safe?
Absolutely. All calculations run locally in your browser — no data is sent to any server.
What is an energy-efficient mortgage (EEM)?
An EEM lets you borrow extra money to pay for home energy improvements, with the logic that utility savings will offset the higher monthly payment. FHA EEMs allow up to $8,000 or 5% of the appraised value (whichever is less) in additional financing. Freddie Mac GreenCHOICE allows up to 15% of the appraised value.
Does a green mortgage save money?
It depends on the rate differential and your improvements. If a $10,000 solar installation saves $100/month but only adds $55/month to your mortgage, you net $45/month immediately. The calculator shows this comparison so you can see the real benefit.
What improvements qualify for a green mortgage?
Qualifying improvements typically include solar panels, heat pumps, insulation upgrades, energy-efficient windows, water heaters, and HVAC systems. The improvements must be cost-effective — meaning projected savings must exceed the cost of the improvement over its lifetime.
What is the difference between FHA EEM and Freddie Mac GreenCHOICE?
FHA EEM is for FHA-insured loans and limits the energy improvement amount to the lesser of $8,000 or 5% of appraised value. Freddie Mac GreenCHOICE has higher limits (up to 15% of appraised value) and applies to conventional loans. Both require a qualified energy assessor to document expected savings.