01
Superheat
Suction line temperature minus evaporator saturation temperature.
— °F
COMMERCIAL HVAC · REFRIGERATION · FIELD SERVICE
Work the problem.
Know your next check.
A practical field companion for diagnostics, calculations, equipment history and reference material — with core tools available offline after the first load.
FIELD WORKSPACE V1.0
0Equipment records
0Service records
0Saved references
Your records are stored locally on this device.
WORKSPACE
Field tools
Safety boundary
HVAC Copilot is a reference and documentation aid, not a substitute for training, supervision, OEM instructions, code requirements or qualified judgment. Follow site procedures and lockout/tagout. Never bypass a safety control or vent refrigerant.
01 / TROUBLESHOOTING
Diagnostic workspace
Build a case from the equipment, observed symptom and actual measurements. Missing data stays visible instead of being guessed.
CASE INTAKE
What are you working on?
GOOD FIELD PRACTICE
Record the measurement, instrument, operating mode and conditions together. A pressure reading without refrigerant, ambient/load and line-temperature context is not enough to establish charge or diagnose a sealed-system fault.
02 / FIELD MATH
HVAC calculators
Local calculations — no AI connection required.
02
Subcooling
Condenser saturation temperature minus liquid line temperature.
— °F
03
Sensible air capacity
Approximate standard-air calculation: 1.08 × CFM × ΔT.
— BTU/h
04
Air velocity
Velocity = airflow ÷ duct cross-sectional area.
— FPM
05
Temperature conversion
Convert Fahrenheit and Celsius.
—
06
3-phase voltage imbalance
Percent imbalance = maximum deviation from average ÷ average × 100.
— %
Calculation limits: Results are arithmetic aids, not equipment targets or acceptance criteria. Air-density assumptions affect sensible capacity. Compare charging and electrical limits with the equipment nameplate and OEM service literature.
03 / ASSET REGISTER
Equipment & service history
Build a local record for units you work on. Records stay in this browser until exported.
EQUIPMENT REGISTER
Add equipment
SERVICE LOG
Record a service visit
04 / FIELD LIBRARY
Knowledge & references
Save verified field notes and keep manuals or documents on this device for offline access.
PERSONAL FIELD NOTES
Add a searchable reference
OFFLINE DOCUMENT STORAGE
Store a manual or reference file
Add PDF, image or text files. Files are saved in this browser's local storage and can be opened again offline after upload. This release does not yet extract PDF text, OCR scans or interpret wiring-diagram images; add searchable text in a field note above.
05 / TROUBLESHOOTING ASSISTANT
Ask HVAC Copilot
Use the built-in offline field guide or connect to NVIDIA Nemotron through your secure Cloudflare Worker. Online text chat requires internet access.
HVAC Copilot
Describe the equipment, symptom and measurements. Attach up to three photos for local preview. Online photo analysis is not connected yet; do not rely on the current AI connection to interpret images.
0/3 attached
Photos currently remain in the browser and are not sent to the AI service. Avoid including customer personal information or confidential site details.
06 / CONFIGURATION
Settings & data
Manage the secure online AI connection and your local field data.
SECURE ONLINE AI
NVIDIA Nemotron connection
HVAC Copilot sends text messages to your Cloudflare Worker, which calls NVIDIA Nemotron through OpenRouter. Your OpenRouter API key stays in Cloudflare and is never stored in this website. This connection currently supports text chat only; photo analysis will be added separately. Online requests require internet access and are subject to OpenRouter free-model limits and availability.
AI modelNVIDIA Nemotron 3 Ultra · free route
ConnectionSecure server-side API key
Photo analysisNot connected yet
DATA PORTABILITY
Back up or restore your records
Export equipment, service logs and field notes as a JSON backup. Reference files are stored separately in this browser and are not included in the JSON backup; keep your original manuals securely backed up.
APP DETAILS
HVAC Copilot Field Edition
Release1.2.0
PlatformiPhone Safari · Windows 10/11 browsers
Core field toolsOffline after first successful load
Data storageLocal to each browser/device
Generative AI / photo analysisNemotron online text AI via Cloudflare Worker
HVAC Copilot is an independent field utility and is not affiliated with any HVAC equipment manufacturer or third-party AI provider.