Model how window film could change solar heat through a building's glass and the cooling electricity that follows. Enter window groups, rated SHGC values, HVAC efficiency and your energy rate, then print a client-ready report. Results are a preliminary cooling-season scenario from your inputs.
1. Building & windows — window groups with elevation and exposed glass area. 2. Film ratings — published 3M Prestige 70, Prestige 50 and Night Vision 15 reference profiles for four glass configurations each or a custom film with exact SHGC values. 3. HVAC & utility costs — effective EER, energy-only rate, optional tonnage, labeled operating assumptions and optional bills. 4. Review & report — preliminary cooling-season range and a printable client report.
Free · No email required. Created by Shore Tint & More, Inc. Last updated October 2, 2026.
For each window group, reference solar heat = glass area × incident sun on the window plane × SHGC. The difference between existing and after-film SHGC gives the change in solar heat at that reference intensity.
That change is divided by the cooling system's effective EER to get avoided electrical power at the reference sun intensity (not a measured or billed peak demand), multiplied by equivalent full-sun hours per day, cooling days and a coincidence fraction to get a cooling-season kWh range, then multiplied by your energy-only rate.
Using 3M's published Prestige 70 reference values for 1/4-inch single-pane clear glass (SHGC 0.82 before, 0.51 after), 200 BTU/(h·ft²) of sun on the glass, EER 12, $0.20/kWh, 2–4 equivalent hours, 120 days and 0.8 coincidence:
Reference solar heat falls from 164,000 to 102,000 BTU/h, a 62,000 BTU/h change (about 5.17 tons equivalent). That is 992–1,984 kWh and $198–$397 of avoided cooling electricity in the scenario. The 37.8% is a solar-heat reduction through that glass, not a share of the electric bill.
SHGC depends on the film and the glass together. A rating published for single-pane clear glass does not describe Low-E or tinted insulated units. Use film-on-glass values published for glass matching yours, or enter custom values with their source. Marketing figures such as infrared rejection or TSER are not SHGC.
Heating-season effects, conduction changes, lighting, humidity, HVAC part-load behavior, weather files and demand charges are not modeled, so the result is not annual net savings, peak demand savings, payback or an energy audit. Utility bills you enter are shown as context and a plausibility check only.
No. It is a preliminary cooling-season scenario built from the inputs and assumptions shown. It is not calibrated to your building, hourly weather or metered data, and it is not a licensed engineering analysis.
The built-in profiles are 3M's published reference values for Prestige 70 and Prestige 50 (Revision A, April 2019) and Night Vision 15 (Revision B, June 2021), each on four specific glass configurations. For any other film or glass, enter the matching manufacturer film-on-glass SHGC values and note the source.
You can enter annual or monthly electricity use and spend as context. The tool never treats the whole bill as cooling cost; it only checks whether the modeled cooling kWh looks plausible next to a full year of data.
Use the effective EER (or EER2) of the cooling system, not SEER. For chilled-water plants, use an effective whole-system value including auxiliary power. A COP converts to EER by multiplying by 3.412.
No. Tonnage is optional and only compares the reference heat change with installed capacity. It does not mean equipment can be downsized.
No. Because heating effects and demand charges are not modeled, the tool reports a cooling-season range only and does not compute ROI or payback.
Request a free estimate or call (302) 947-4624. Shore Tint & More (Delaware Window Film) — 3M Authorized Dealer, IWFA accredited, serving Delaware and the Maryland Eastern Shore since 1989.