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Reload last session

HVAC Lens keeps one shared work file on this device for all calculators. Values are saved as you work; a new app session starts blank until you choose to reload.

What is saved

• One file for RefCalc, Electrical, Air Flow, Heat Gain, and Heat Loss.
• When you leave a step (Prev / Next / step list) or leave the page, inputs are written into that file.
• The file is overwritten each save (no multi-job history) to save space.
• Step changes merge into the file — earlier steps are not deleted when you move on.

New session

• Opening the app in a new browser session starts tools blank until you choose to reload.
• If saved inputs exist, a prompt appears on any screen (main menu or the last tool/step the app reopened) — once per open until you answer.
• Reload last session restores inputs (and refreshes the tool if you are already on one).
• Not now hides the offer for this session without loading data.
• Don’t show this again turns the offer off until you re-enable it under Settings → Work session.

Clear

• Clear All on a tool clears that tool’s slice of the shared file.
• Clearing browser site data removes the whole work file.

Note: Theme, license, and unit preferences use separate storage — not this work file.