# Thermal Transmittance Calc — Determination of heat loss

> Calculates building heat loss and humidity issues based on material layers and environmental data. (iPhone/iPad app by ALEXEY KOZLOV.)

- Source: https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621 (this page in markdown: same URL + `.md`)
- Developer: [ALEXEY KOZLOV](https://appshunter.io/developer/1393860478)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 4.10/5 from 10 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 98 MB
- Languages: American English, Danish, Dutch, Finnish, French (France), German (Germany), Japanese, Korean, Norwegian Bokmål, European Portuguese and 5 more
- Released: 2019-08-24
- Data updated: 2026-08-18
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews.md

## What is Thermal Transmittance Calc?

This application allows you to help in checking the existing and planning future isolation. After entering data on the temperature and humidity of the air and selecting all layers of the enclosing structure (starting from inside the building and ending with the exterior trim of the facade or roof) in the Thermal Transmittance Calc, you will receive information on all likely heat losses, as well as possible problems with humidity. A schedule will be built, according to which you can track how the temperature and humidity will change and where the dew point in the layers of the structure will be.

- Easy to use, enter all the data and immediately get the results.
- Ability to enter the temperature in both Celsius and Fahrenheit.
- Ability to enter the size of the layer in centimeters and inches.

## Key features

- Calculate heat loss
- Identify humidity problems
- Visualize temperature and dew point changes
- Supports Celsius and Fahrenheit
- Supports centimeters and inches
- Easy data entry and immediate results

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |
| Creating a new material | $2.99 | one-time |


## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/thermal-transmittance-calc/id1473745621/reviews.md

### 3/5 — Missing basic features

*2024-11-02, version 1.4*

App missing basic features. overall good app, however if there was an option to build : Wall layers , another one be called Roof layers ,another ground layers. That way will make more sense 
A useful option would be to see the layers in a 3d like image
Another suggestion is that ,allowing the production of a report that shows all the above suggestion on one paper
Cutdown to do the developer , please carry on developing the app

### 5/5 — Good app would like to collaborate

*2023-05-06, version 1.3*

I’ve been using this app on site surveys to compile quick u-value calculations based on what constructions are actually on site. 
I would be interested in rebranding/reselling this app to other surveying companies in my sector, but don’t actually seem to be getting any responses from the developer to my sent emails?

### 3/5 — M Biernat

*2021-12-15, version 1.3*

I am an architect in England. This would be a seriously useful app, but the values for air in cavities where convection is a dominant feature and wall ties are required are very wrong. The developer needs to consult British and international standards for this app to be useful for professionals.

### 5/5 — Works great but missing basic features

*2021-06-16, version 1.3*

Good quick checking tool for facade build ups, but it appears to be missing very basic functionality, such as saving and re-loading your proposed wall assemblies. Localised weather data for a 12 months period would also assist with determining interstitial condensation risk for the full spectrum of climatic conditions. Hopefully, the app will continue to be developed to include additional functionality and features.

### 4/5 — Good Dew point app

*2021-05-01*

It does what is supposed to do, it only needs two things; 1.) Save wall builds styles 2.) export capabilities, jpeg, pdf, and/or dwg 
Hope you can make those requests soon to get you to the five stars

**Developer response:** Thank you for your feedback. This functionality will be added in future updates.

### 4/5 — Quality Support Manger

*2020-02-28*

Would be helpful to have material properties explained and in imperial units when creating new materials.  Graphics are very good.  How can you save typical wall constructions for future reference.  Make adding a material in the wall assembly possible. Seem to only be able to delete.  Very helpful as a quick check on condensation potential.

**Developer response:** Thanks for your feedback. An explanation of material properties will be added in a future update. To add material to the structure, click the "edit" button and drag the selected material to the desired position.

## Frequently asked questions about Thermal Transmittance Calc

### What is Thermal Transmittance Calc used for?

Thermal Transmittance Calc helps you check existing and plan future building insulation. It calculates likely heat losses and potential humidity problems by analyzing the layers of your building's structure and environmental conditions.

### Does Thermal Transmittance Calc have ads?

Yes, Thermal Transmittance Calc contains advertisements. This is common for free utility applications that offer in-app purchases for additional features or an ad-free experience.

### What units does Thermal Transmittance Calc support?

Thermal Transmittance Calc supports flexible unit input. You can enter air temperature in both Celsius and Fahrenheit, and layer sizes in centimeters and inches.

### How does Thermal Transmittance Calc show results?

The app provides a schedule that visualizes how temperature and humidity will change within the building structure. It also indicates where the dew point will be located in the different layers.

### What devices is Thermal Transmittance Calc available on?

Thermal Transmittance Calc is available for iPhone, iPad, and iPod devices. It is designed for Apple's mobile operating system.

### How often is Thermal Transmittance Calc updated?

The latest version of Thermal Transmittance Calc is 1.5, last updated on February 14, 2026. This indicates a relatively recent update, suggesting ongoing development and support.

### What is the age rating for Thermal Transmittance Calc?

Thermal Transmittance Calc has an age rating of 4+. This means it is considered suitable for children aged 4 and above, with no mature content.

### What is the user rating for Thermal Transmittance Calc?

Thermal Transmittance Calc has a user rating of 4.1 stars based on 10 ratings. This suggests that most users find the app to be useful and of good quality.

## Version history (last 5 releases)

### 1.5 — 2026-02-14

Bugs fixed.

### 1.4 — 2023-12-12

Bugs fixed.

### 1.3 — 2021-05-17

Bugs fixed.

### 1.2 — 2020-02-29

Bugs fixed.

### 1.1 — 2019-10-14

Fixed bugs.

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## More apps by ALEXEY KOZLOV

- [Angle Meter 360](https://appshunter.io/ios/app/angle-meter-360/id1393860479)
- [Rocket Protector](https://appshunter.io/ios/app/rocket-protector/id1410179786)
- [Illuminance Pulsation Meter](https://appshunter.io/ios/app/illuminance-pulsation-meter/id1456605148)
- [MixArt Photo Editor](https://appshunter.io/ios/app/mixart-photo-editor/id1515137468)

All apps by ALEXEY KOZLOV: https://appshunter.io/developer/1393860478

## Related topics

[thermal insulation calculator](https://appshunter.io/ios/topics/thermal-insulation-calculator) · [uvalue](https://appshunter.io/ios/topics/uvalue)

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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 2026-08-18.*