# SwiftSize — Quick Heat Load Calculator > HVAC heat load calculator for residential equipment changeouts. (iPhone/iPad app by Design Comfort.) - Source: https://appshunter.io/ios/app/swiftsize/id942306458 (this page in markdown: same URL + `.md`) - Developer: [Design Comfort](https://appshunter.io/developer/942306457) - Category: Business, Productivity - Price: $9.99 - Rating: 4.00/5 from 3 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 13.5 · 1 MB - Languages: American English - Released: 2015-01-14 - Data updated: 2026-08-03 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/swiftsize/id942306458/reviews.md ## What is SwiftSize? SwiftSize is an HVAC (heating, ventilation, and air conditioning) load calculator for residences. It is designed to very quickly measure off a home's exposures "on the fly" and produce accurate results for sizing heating and air conditioning equipment. Now generates a shareable PDF Report! It is designed to minimize the on-site engineering time required by the HVAC professional. Less time engineering means more one-on-one time with the customer! HVAC heat loads can be a cumbersome and time consuming and tend to distract from time spent consulting. SwiftSize addresses this problem by allowing complete heat loads to be performed in mere minutes. If it takes you more than 10 minutes with SwiftSize you're doing something wrong! SwiftSize is not a comprehensive room-by-room heat loss/heat gain/CFM calculator. If it were it would be SlowSize! It's intended for the equipment changeout market, not the new construction market. ## Key features - Quick heat load calculations - On-site measurements - Accurate equipment sizing - Shareable PDF reports - Minimizes engineering time - Equipment changeout focus ## Chart rankings - #129 in Top Paid · Business (US App Store) ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/swiftsize/id942306458/reviews.md ### 3/5 — Not ready for prime time *2023-05-07, version 2.0.1* I used to use a different app for load calculations. This one gave an inaccurate calculation and there isn’t a way to figure out what is wrong. I started with my own house and know the exact load due to temperatures hitting design temps for 2 days straight. This said I needed 66% more capacity. ### 5/5 — Equipment sizing *2022-02-23, version 2.0.0* Great accurate app for ensuring I’ve got the right equipment for the job, loads are precise and the video is super helpful to understand the way to use the app. ### 1/5 — Paid for junk *2018-04-12, version 1.2.4* Poorly designed won’t save anything or allow the information be printed off so we can give it to an inspector. What a waste of money and time for what so I can buy an app that does work. ### 1/5 — Do not download *2018-04-06, version 1.2.4* This app does not do what it says. Interface is very poorly designed. ### 1/5 — Skip this app *2015-07-08, version 1.1.6* Does not save data, incomplete insulation options. This is not a finished product. ### 5/5 — SwiftSize load app *2015-01-15, version 1.1.5* This app is great and all we need most of the time. I use 3 other iPad apps also and have done long hand manual J for 30 plus years. This is the one that will be a first to use from now on. Thank you very much. ## Frequently asked questions about SwiftSize ### What is SwiftSize used for? SwiftSize is an HVAC load calculator designed for residential equipment changeouts. It helps professionals quickly measure home exposures and accurately size heating and air conditioning equipment. ### How fast can I calculate heat loads with SwiftSize? SwiftSize is designed to perform complete heat loads in mere minutes. The developer suggests that if it takes more than 10 minutes, you are likely not using it efficiently. ### Can SwiftSize be used for new construction? No, SwiftSize is specifically intended for the equipment changeout market, not new construction. It is not a comprehensive room-by-room heat loss/gain/CFM calculator. ### Does SwiftSize generate reports? Yes, SwiftSize now generates a shareable PDF report of your heat load calculations, which can be useful for documentation and customer communication. ### What devices does SwiftSize support? SwiftSize is available for iPhone, iPad, and iPod devices. It is designed to be used on the go. ### How much does SwiftSize cost? SwiftSize is a paid application, priced at $9.99. This one-time purchase grants you access to its features. ### When was SwiftSize last updated? The latest version of SwiftSize, 2.1.2, was last updated on August 1, 2025. This indicates ongoing support and potential improvements. ### Does SwiftSize have ads? No, SwiftSize does not contain advertisements. As a paid application, it offers an ad-free experience for users. ## Version history (last 5 releases) ### 2.1.2 — 2025-08-01 Fixed keyboard clipping on iPad ### 2.1.1 — 2025-07-31 Fixed keyboard shrinking on iPad. ### 2.1.0 — 2025-07-24 - Fixed cursor alignment on Take-Off screen - Added Generate PDF report feature. ### 2.0.1 — 2022-02-25 Added a clear all option for reseting all data including the infiltration parameters. ### 2.0.0 — 2022-02-23 Updated look. 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User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-03.*