# Proxytherm vs Engineering Calculator HVAC

Proxytherm and Engineering Calculator HVAC are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Proxytherm ships an update every 7 months, Engineering Calculator HVAC every 6 months. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Proxytherm | Engineering Calculator HVAC |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 months** |
| Size | 32 MB | 19 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandr Bychkovskiy](https://appshunter.io/developer/1487846978) | [aleksandr bronnikov](https://appshunter.io/developer/1885003900) |

## What reviewers say

### Proxytherm

[App page](https://appshunter.io/ios/app/proxytherm/id6744809636)

**Features:** macOS Compatibility

**In-app purchases:** none


### Engineering Calculator HVAC

[App page](https://appshunter.io/ios/app/engineering-calculator-hvac/id6760564633)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Proxytherm free?

Proxytherm is free to download, with no in-app purchases.

### Is Engineering Calculator HVAC free?

Engineering Calculator HVAC is free to download, with no in-app purchases.

### Do Proxytherm or Engineering Calculator HVAC have ads?

Neither Proxytherm nor Engineering Calculator HVAC shows ads.

### Which is updated more often, Proxytherm or Engineering Calculator HVAC?

Proxytherm ships an update every 7 months, and Engineering Calculator HVAC every 6 months. Most recently, Proxytherm was updated on October 5, 2026 and Engineering Calculator HVAC on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*