Home Energy Note Classifier

How Home Energy Note Classifier works

Press Load model once: your browser downloads Gemma 4 E2B instruction-tuned (web build) (2.0 GB) from this site and keeps it in its cache. Then add your text and press Classify locally. The model runs on this device using your graphics card, so nothing you enter is sent to a server. Until the model is loaded, or if your device cannot run it, the tool falls back to a simple keyword check and labels the result as the fallback.

Gemma 4 E2B instruction-tuned (web build) is a small open language model from Google. The tool sends it the instruction below plus your text, asks for a JSON answer with fixed fields, and shows each field as a card. It runs at temperature 0, so the same input gives the same answer on the same device, though different graphics cards can word it slightly differently.

Inputs longer than 6,000 characters are cut to that length before they reach the model, and the result says so. The model only sees what you paste: it does not look anything up.

The instruction the model gets

You read a homeowner's note about home energy problems and sort each problem into one of these categories: Heating and cooling (HVAC), Insulation and air sealing, Windows and sun gain, Appliances and plug loads, Water heating, Lighting. A gas boiler, furnace, heat pump or radiators is Heating and cooling (HVAC); drafts, gaps, thin insulation or cold rooms near the roof or walls are Insulation and air sealing. Quote the clue from the note for each problem. Do not estimate costs or savings and do not do arithmetic.

What it returns

• Main category: The category that best fits the main problem in the note.
• Problems by category: One entry per problem, written as 'Category: clue from the note'.
• What to check next: Two or three simple checks or questions for a home energy audit, based on the note.

Worked example

The model's output for the built-in sample, recorded on a desktop browser. Your run may word things slightly differently.

Home energy note: Upstairs rooms hot after 3pm, attic insulation looks thin, HVAC runs constantly, west windows get direct sun, bill jumped 28% in June.

Main category

Heating and cooling (HVAC)

Problems by category

Heating and cooling (HVAC): Upstairs rooms hot after 3pm Insulation and air sealing: attic insulation looks thin Heating and cooling (HVAC): HVAC runs constantly Windows and sun gain: west windows get direct sun

What to check next

Check the thermostat settings. Inspect the attic insulation depth. Examine the west windows for heat gain.

The model

The files are served from this site, versioned so a cached copy is never stale. Nothing is fetched from a third party while you use the tool.

Limitations

• Small language models make mistakes: they can miss an item, merge two, or state something more confidently than the text supports. Check the result against your input before you rely on it.
• It needs WebGPU and about 8 GB of memory, so it is offered on desktops and laptops, not on phones and tablets. Devices that cannot run it get the keyword fallback, clearly labelled.
• Results describe the input you gave, not the real-world situation behind it. Review them yourself before acting.

Good uses

• Triage climate and sustainability notes before deeper review
• Prepare consistent labels for repeat workflows
• Reduce manual sorting on small batches
• Keep sensitive drafts in the browser preview