Enerlytics — Roof Replacement Estimator

1Project & building

Project name

Customer name

Street address

City

State

ZIP

Building type

Building area (SF)

Roof area (SF)

Year constructed (optional)

Year constructed is only used if the existing insulation R-value (below) is unknown — it drives an age-based assumption. Leave it at the default, or blank, if the insulation R-value is already known.

2Existing roof

Membrane type

Membrane age (yrs)

Insulation R-value known?

Deck material

3Proposed roof

Membrane type

Deck is assumed retained from the existing roof.

4Solar reflectance (cool roof)

Existing reflectance override (0–1)

Proposed reflectance basis

Proposed reflectance override (0–1)

Solar reflectance is applied to BOTH roofs \u2014 the existing roof always uses its as-found (aged) value, the proposed roof uses the basis selected above. Defaults come from the membrane types selected in the previous two sections (e.g. black EPDM ≈ 0.06, white TPO ≈ 0.65 aged). Override either with a measured or CRRC-listed value when known.

5Operating schedule

Pre-filled with typical values — adjust to match the actual schedule.

Open (hour, 0-23)

Close (hour, 1-24)

Days / week

Weeks / year

Heating setpoint (°F)

Cooling setpoint (°F)

6HVAC & utility rates

Existing heating system

Heating efficiency override

Cooling EER override

Electricity ($/kWh)

Natural gas ($/therm)

Fuel oil ($/gal)

Propane ($/gal)

Elec. escalation /yr

Gas escalation /yr

Oil escalation /yr

Propane escalation /yr

7Project cost & map

Proposed roofing project cost ($, optional)

Google Maps API key (optional, Static Maps API)

The key is only used to build an image URL in your browser — it is not sent anywhere by this page. Anyone using this page can see it in the page source, so use a key restricted to the Static Maps API.

8Contractor branding (optional)

Appears on the customer report. Saved in this browser only.

Company name

Salesperson

Brand color

Address

Phone

Website

Logo (PNG/JPG, small file)

Each table holds every other input at its current value on the form above and varies only the one factor shown.

Insulation R-value (rows = existing, columns = proposed)

Utility rates & HVAC efficiency

Proposed roof solar reflectance

Formula-driven sanity checks that the model behaves the way basic engineering intuition says it should — not a calibration against a real building or a full hourly simulation.

Roof-related load: existing vs proposed (MMBtu/yr)

Year-1 savings by fuel ($/yr)

Cumulative savings, years 1-20 ($)

Savings vs proposed R-value, by existing R-value

Roof Replacement Energy Savings Estimate

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estimated annual utility-cost savings

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10-year cumulative savings

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simple payback (years)

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est. CO₂ reduction (tons/yr)

Item	Value

Calculation assumptions

This analysis is an estimate of potential energy savings based on the information provided and the assumptions listed above. Actual energy consumption and savings will vary with weather, occupancy, operating schedule, HVAC equipment condition, utility rates, and other factors. It is not a guarantee of savings and is not a substitute for a certified energy audit or a stamped engineering analysis. Roof-conduction and solar-reflectance effects only; solar data uses a regional NREL station (NYC) as a proxy and a simplified daily distribution — internal gains, thermal mass, infiltration and HVAC part-load behavior are excluded.