# Heatloss Calculator & Guide — user reviews > 15 indexed App Store user reviews of Heatloss Calculator & Guide by Mr Combi Training, rated 1.50/5 from 2 ratings. - Source: https://appshunter.io/ios/app/heatloss-calculator-and-guide/id620793018/reviews - App overview in markdown: https://appshunter.io/ios/app/heatloss-calculator-and-guide/id620793018.md - Rating breakdown: 5★ 0 · 4★ 0 · 3★ 0 · 2★ 1 · 1★ 1 ## Most critical reviews (10 lowest-rated) ### 1/5 — Terrible app *2023-12-11* App is inaccurate and everything is in Celsius and MM. waste of $5 ### 1/5 — Can’t add windows as per other reviews *2022-11-21* Heatloss options very limited on insulation. Better than nothing but not much better. ### 1/5 — NOT WORTH IT *2018-11-06* Surprised Apple allow this app on its store. Does not allow you to add rooms Can’t email even a single rooms result Does not do what it says on the tin. **Developer response:** Hi SolarMan, we're sorry you're unhappy with your purchase. The app does indeed do everything as written in the app description, you can calculate the heatloss of a room, you can save the results, you can email the results and you can even calculate the total heatloss for multiple saved results. If you need any help with using the app then don't hesitate to get in touch. ### 1/5 — Very limited *2018-05-08* Can only calculate one room at a time and does not accumulate Not worth it Freebies out there do more ### 1/5 — No *2016-04-21* Very basic, not happy with this purchase, I want my money back. ### 1/5 — Very limited *2016-03-31* Very limited on what the heatloss calculator does. Basic information and no accumulated heatloss calculations associated with one property consisting of all rooms. ### 1/5 — Useless *2014-10-21, version 2.4* The insulation R values cannot be changed to realistic values making an accurate calculation impossible. ### 2/5 — Site address results *2023-06-14* Need the option to group all the results of a property into one file and allow printing , e mailing . At moment have to save each room separately. ### 2/5 — Great ideas and easy to use but missing options *2020-08-28* Would love to see other wall type and insulation type options added. Eg solid stone walls missing from list. Then an ability to add insulation depths to see impact on heat loss. ### 2/5 — GUI data entry issue *2015-12-28, version 2.6* I provided the room diamensions in feet as Length 20' Width 14' Height 10 ' When I come to the outside wall the only way it works is if I show 20' There is only one number that can be entered in this field, so if I have a window of 32sq feet and show 1 as in one outsidewall as the other apps requie then I get an error message telling me " Area of window exceeds the total wall area. The user interface should indicate what is required to be enteded in the outside wall field. otherwise this app is useless. ## Most praised reviews (5 highest-rated) ### 5/5 — Great apps *2017-10-04* Great apps stops me worrying about ACS ### 5/5 — Excellent *2014-04-22* Really good, use it everyday. Thanks George! ### 5/5 — Simple *2013-11-10* Brilliant simple app that does just what you want it to do Not sure how it compares to other calcs, in my experience they all come up with different answers but I'm happy with this one ### 3/5 — Mr. *2016-02-08* There is an error in heat loss calculation, comparing the total windows area with that of a wall area. It gives an error message even if the window area is less than 30% of the wall area and hence crashes. ### 3/5 — Needs options *2015-03-18* I've just downloaded and seems awesome, but needs some more options. Wall U-values, floor, and ceiling U-values are limited what if it's new build? Is this Mcs compliant? If these could be updated this would be perfect. --- *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 2026-09-04.*