HVAC vs CTC Info
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HVAC
This app provides quick and easy calculations for HVAC professionals and enthusiasts. It simplifies complex formulas for energy use, airflow, and duct dimensions, making them accessible on your iPhone or iPad.
- SFP calculations
- Heat recovery efficiency
- Air velocity in ducts
- Duct dimensioning
- Pressure drop calculations
- Equivalent diameters
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HVAC Calculator is an app that performs many calculations that are useful to have available for anyone working with or have interest in HVAC and energy use in buildings. The app performs many of the calculations that you never remember the formulas for when you need them for quick calculations, for example in a meeting or out on the construction site. Many of the calculations can also be a bit difficult to calculate with a normal calculator. Now you can perform these calculations easily on your iPhone/iPad. The app is universal, so you only have to buy it once to use it on both iPhone and iPad. The app helps you calculate all this and more: -SFP from measured/design fan power and airflow -SFP at reduced airflow for VAV ventilation -SFP at design conditions or maximum performance for VAV ventilation -Temperature efficiency of heat recovery -Temperature after heat recovery unit (HRU) in air handling unit (AHU) -Temperature of exhaust air from air handling unit after heat recovery -Actual temperature efficiency of heat recovery when the exhaust temperature is limited to minimum 5°C for reuse as frost free garage ventilation -Air velocity in ducts with known dimensions and airflow -Maximum airflow in a duct with dimensions and maximum air velocity as specified requirements -Dimensions of rectangular and circular spiral ducts for specified air flow and velocity requirements -Pressure drop in Pa/m for rectangular and circular spiral ducts -Equivalent diameters for rectangular ducts -Hydraulic diameter for rectangular ducts
CTC Info
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CTC Info allows you to view CTC's entire product range. In addition, you can find the complete relevant documentation and information on all of our products. There is also the possibility of downloading documents for offline mode, i.e. you can read the documentation even when you are not connected to the internet.
Screenshots
Verdict
The clearest difference is price: CTC Info at Free against HVAC's $4.99. On update cadence, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
CTC Info is free to download; HVAC costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
HVAC ships an update every 5 months, CTC Info every 7 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | HVAC | CTC Info |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 14 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Trond Rossvoll | CTC AB |
In-app purchases
HVAC
No in-app purchases
CTC Info
No in-app purchases









