3.0: Intervention Check Intervention Check compares logged room readings before and after a recorded change. Review median humidity, temperature and moisture content with sample counts and time spans. • Open a room → Intervention Check and record what changed and when. • Choose an equal 1–168 hour window before and after the marker. At least three valid readings on each side are needed. • Compare the medians and share the frozen reading report. Samples are equally weighted, not continuous monitoring. GPP uses temperature, humidity and site-altitude pressure. Readings outside the supported temperature/humidity range are excluded and counted. A change does not prove cause, dry materials, safe remediation or absence of mold.

Adds Air Swap, seven-day Drying Forecasts, and a bundled offline EPA moisture library. Navigation and room-analysis workflows were also strengthened across iPhone and iPad.

Version 2.2 adds three practical field tools: - Air Swap compares indoor and outdoor moisture mass in grains per pound, estimates outdoor air after conditioning, and tells you whether ventilation is likely to dry the room or add moisture. - Drying Forecast analyzes up to 40 recent readings over seven days, reports trend and confidence, and estimates time to the room's target humidity when the data supports it. - EPA Field Library includes two complete offline publications: the 144-page Moisture Control Guidance and the 20-page Brief Guide to Mold, Moisture and Your Home. - Native tab navigation improves reliability when moving among documents, tools, and rooms. All calculations, rooms, history, and documents remain available offline with no account, ads, analytics, or tracking.

Version 2.1 - Moisture Action Plan - New Moisture Action Plan tool: combine indoor readings, coldest surface temperature, outdoor air, target humidity, room volume, tightness, and air-change goal into a single pro triage score. - Condensation margin: see how many degrees the coldest surface sits above or below the dew point, with clear at-risk and condensing labels. - Ventilation verdict: compares indoor, target, and outdoor grains per pound so users know when outdoor air will dry the room and when it will add moisture. - Dehumidifier sizing: estimates holding load in pints/day and recommends a practical AHAM-style unit class. - Dry-out action plan: prioritized fixes plus right-now, next-24-hours, and this-week steps for basements, windows, crawlspaces, cellars, and other moisture-sensitive rooms. - Pro field boards: twelve high-resolution offline reference boards for basement dry-out, window condensation, crawlspaces, HVAC latent load, wood movement, cellar preservation, bath/kitchen exhaust, concrete cure, grow-room VPD, bedroom comfort, heat safety, and client reporting. - Added focused tests for the new action-plan engine and refreshed App Store screenshots for iPhone and iPad.

This update sharpens the interface: the iPad layout now uses a centered, comfortable reading width instead of stretching edge to edge. iPhone is unchanged; still fully on-device.

Dewpoint Rooms 2.0 — a pro upgrade for building-science and HVAC pros, still 100% offline. • Air Properties explorer: a pressure-aware psychrometric calculator (GPP, enthalpy, wet-bulb, density, VPD, absolute humidity) with altitude correction and a sea-level delta. • Two-stream mixing: blend return and outside air. • Wood EMC & Drying: Hailwood-Horrobin equilibrium moisture content, dimensional movement by species, and an acclimation-days estimate. • Dehumidifier Sizing: pints/day from grain depression plus ventilation ACH/CFM to ASHRAE 62.2. • Per-room condensation margin: log surface temperatures and see how close each room is to condensing. • Technician PDF site report with air state, full properties, verdicts, and your reading log. All math is standards-grounded and verified against published values. No account, no network — everything stays on your device.

What's New - Version 1.1 Two new tools for plant growers and outdoor workers, plus VPD in every room view. VPD Calculator (Tools tab) Vapor Pressure Deficit is the single most important number for plant transpiration and growth. The new calculator computes both air VPD and leaf VPD (accounting for the 1-4 C leaf cooling offset that distinguishes a grow-room reading from what the plant actually experiences). Pick your grow stage - Propagation, Seedling, Vegetative, Early Flower, or Late Flower - and the tool shows a color-coded zone verdict (Too Low / Low / Ideal / High / Too High) with the correct kPa target range for that stage. A leaf-offset slider (0-5 C, default 2 C) lets you dial in canopy measurements from an infrared thermometer. Targets are sourced from Cornell eGRO bulletin E-816 and the Pulsegrow VPD guide; the Magnus-Tetens saturation vapor pressure formula matches the precision of Buck (1981) over the full horticultural temperature range. Heat Safety - WBGT & Flag Colors (Tools tab) Shade Wet-Bulb Globe Temperature built on the Stull (2011) wet-bulb approximation (0.65 C over 0-50 C / 5-99 % RH). The shade form is WBGT = 0.7 Tw + 0.3 Tdb - the most useful estimate when you don't have a globe thermometer. The tool displays: - U.S. Army flag color (White / Green / Yellow / Red / Black) with threshold and guideline text - ACGIH TLV 2023 work-rest schedule for Light, Moderate, and Heavy intensity (continuous -> 45/15 -> 30/30 -> 15/45 -> stop) - OSHA heat index risk level (Lower / Moderate / High / Very High / Extreme) with required action - Wet-bulb temperature, WBGT in both F and C, and heat index in the summary badge VPD in Room Views Air VPD now shows as a stat on the Now screen alongside Temperature, Humidity, Mold Risk, and Comfort. In Room Detail, every reading in the recent list displays dew point and VPD side by side. Growers tracking grow-room conditions over time can now see VPD history without leaving their room view. Under the Hood - 51 new XCTests covering VPDService and HeatSafetyService (saturation vapor pressure accuracy, all zone boundaries, flag color thresholds, ACGIH TLV monotonicity, OSHA risk levels at each tier). - Settings version correctly reads 1.1 (4).

Dewpoint Rooms 1.2 adds a Feels Like calculator (heat index, wind chill, humidex), a composite Indoor Air Quality score (0–100, A+–F) with a per-factor breakdown, and CSV export of your readings. Fully offline building-science math — no account, no tracking.

Updated the app icon with a premium detailed design and refreshed the App Store build.