# Fluence Design — HVAC Psychrometrics and Sizing

> HVAC Psychrometrics and Sizing (iPhone/iPad app by Tripp Martin.)

- Source: https://appshunter.io/ios/app/fluence-design/id6799210508 (this page in markdown: same URL + `.md`)
- Developer: [Tripp Martin](https://appshunter.io/developer/1896282734)
- Category: Business, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2026-08-20
- Data updated: 2026-09-18
- User reviews in markdown: https://appshunter.io/ios/app/fluence-design/id6799210508/reviews.md

## What is Fluence Design?

Turn the dials. Every property updates live.

Fluence is the HVAC design calculator built for the office and the field—a single, tactile workspace that replaces jumping between apps and spreadsheets.

Fluence includes a permanent free tier. Features identified below as Fluence Pro require a separate auto-renewable subscription. A free trial may be available to eligible new subscribers. Price and trial terms are shown before purchase.

PSYCHROMETRICS

Fluence Free includes State 1 psychrometrics. Enter any pair of properties and watch dry-bulb, wet-bulb, dew point, humidity ratio, enthalpy, specific volume, and relative humidity update in real time. Elevation-corrected ambient outdoor conditions are available with one tap.

States 2–4 and state-to-state load calculations require a separate Fluence Pro subscription.

MIXED AIR — FLUENCE PRO SUBSCRIPTION REQUIRED

Blend two air streams and immediately see sensible, latent, and total air-side loads for coil estimates. Ideal for field checks and design iterations.

FAN & PUMP AFFINITY

Included with Fluence Free. Change speed, flow, pressure, or power and see the before-and-after operating points. Classic affinity laws, presented clearly.

DUCT & PIPE SIZING

Fluence Free includes round and rectangular duct sizing up to 1,000 CFM, plus core pipe sizing materials and ranges.

Flat-oval duct, duct sizing above 1,000 CFM, liquid flows above 50 GPM, and the complete selection of fluids, materials, sizes, and ranges require a separate Fluence Pro subscription.

PDF REPORTS

Included with Fluence Free. Generate clean PDF reports you can share or file. Choose sections, add context, and hand results to clients or the office.

BUILT FOR REAL WORK

• Fully offline except optional Apple Weather ambient conditions and localized elevation
• IP and SI units, remembered per preference
• English, French, German, and Spanish
• No account required
• Permanent free tier
• Optional Fluence Pro auto-renewable subscription
• Fluence Free remains available if a subscription is canceled

Designed for HVAC engineers, designers, and technicians who need accurate answers quickly—without leaving the job site.

Results are an engineering aid. Always verify with a licensed professional before use in design, construction, or commissioning.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Terms of Use: https://fluencedesign.app/terms

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Fluence Pro Annual | $9.99 | per year |



## Version history (last 2 releases)

### 1.0 — 2026-09-12

Fluence 1.0 brings improved psychrometric calculations and input validation, corrected SI pipe-sizing displays, and more consistent engineering reports. This update also improves localized text, accessibility labels, and subscription messaging.

### 0.95 — 2026-08-20

No release notes.

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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 2026-09-18.*