Fluence Design
HVAC Psychrometrics and Sizing
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
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.
The developer, Tripp Martin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Merlin Martin
- Size
- 8.2 MB
- Category
- Business
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 3 more
- English, French, German, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Fluence Pro Annual $9.99
- Copyright
- © Merlin Martin