# Dewpoint Rooms — Humidity and dew point

> Humidity and dew point (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/dewpoint-rooms/id6771020162 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities
- Price: $3.99
- Age rating: 12+
- Requires: iOS 17.0 · 69 MB
- Languages: American English
- Released: 2026-05-20
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/dewpoint-rooms/id6771020162/reviews.md

## What is Dewpoint Rooms?

Dewpoint Rooms is an offline dew-point, humidity, and moisture-control workbench for basements, bedrooms, workshops, cellars, kitchens, job sites, grow rooms, and rooms where temperature and moisture matter.

Enter temperature and relative humidity to understand dew point, wet bulb, grains per pound, absolute humidity, condensation risk, comfort, mold conditions, room targets, and preservation ranges. Log rooms over time, compare readings, and export reports without an account or internet connection.

PRO MOISTURE ACTION PLAN
The new Moisture Action Plan turns readings into a prioritized dry-out plan. Add indoor temperature/RH, coldest surface temperature, outdoor air, room volume, target humidity, tightness, and air-change goal. Dewpoint Rooms calculates:

- moisture readiness score
- condensation margin
- indoor/outdoor grains comparison
- whether ventilation helps or hurts
- recommended dehumidifier class
- required CFM for target ACH
- mold and IAQ risk
- right-now, 24-hour, and one-week action steps

PRO FIELD BOARDS
Twelve high-resolution offline field boards cover 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.

AIR SWAP
Relative humidity alone cannot tell you whether opening a window will help. Air Swap compares indoor and outdoor moisture mass in grains per pound, calculates outdoor dew point, estimates the relative humidity of that air after it reaches the indoor temperature, and gives a clear ventilation verdict.

DRYING FORECAST
Open any tracked room to analyze its recent drying trend. Dewpoint Rooms uses up to 40 readings across the last seven days to show direction, rate, sample span, confidence, and an estimated time to target when the trend is strong enough.

OFFLINE EPA FIELD LIBRARY
Carry two complete EPA moisture references without a network connection: Moisture Control Guidance for Building Design, Construction and Maintenance and A Brief Guide to Mold, Moisture and Your Home. The native document reader supports paging, zoom, rotation, and search.

ROOMS AND REPORTS
Track multiple rooms with target RH bands, 30-day temperature/RH charts, mold-risk timelines, IAQ scoring, CSV export, and offline PDF site reports.

TOOLS INCLUDED
- Dew-point and vapor-pressure calculator
- Indoor/outdoor Air Swap moisture comparison
- Condensation predictor
- Psychrometric-style comfort chart
- Air properties with altitude correction
- Dehumidifier and ventilation sizing
- A/C delta-T diagnostics
- Manual J Lite sizing reference
- Mold timeline planner
- Concrete cure tracker
- VPD calculator for plant environments
- Heat safety WBGT / work-rest guidance
- Wood EMC and drying planner
- Seven-day room Drying Forecast
- Sourdough, fermentation, cellar, humidor, and sleep comfort tools

Dewpoint Rooms is private by design. It has no account, no ads, no analytics, no tracking, and no developer cloud. Rooms, readings, notes, exports, and reports stay on your device unless you choose to share them.

The app provides educational estimates and planning guidance. EPA publications are included for reference and retain their original attribution. Dewpoint Rooms is not a substitute for certified HVAC design, laboratory testing, medical advice, structural inspection, or professional remediation.


## Version history (last 5 releases)

### 2.3 — 2026-08-21

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.

### 2.2 — 2026-07-30

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.

### 2.1 — 2026-06-29

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.

### 2.0.1 — 2026-06-25

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.

### 2.0 — 2026-06-21

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.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*