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  • SwiftSize screenshot 1
  • SwiftSize screenshot 2
  • SwiftSize screenshot 3

About 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.

What’s new

Version 2.1.3 · Updated October 23, 2026

Fixed Keyboard Layout issue and is now Apple Duo friendly

App privacy

The developer, Design Comfort, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to SwiftSize

Looking for apps like SwiftSize? Here are 6 similar apps on the App Store. The highest rated is Ductulator - Duct Sizing (4.7/5), and 3 of the 6 are free to download.

SwiftSize vs. alternatives
App Rating Price Last updated Compare
SwiftSize 4.0 / 5 (3 ratings) 9.99 USD October 23, 2026
HVAC Load Plus 2.8 / 5 (5) 24.99 USD Apr 24, 2026 Compare
HVAC Residential Load Calcs 3.0 / 5 (3) 34.99 USD Apr 20, 2026 Compare
LaserCalc Mobile 3.7 / 5 (6) Free Sep 16, 2026 Compare
Ductulator - Duct Sizing 4.7 / 5 (361) 3.99 USD Mar 24, 2026 Compare
CoolCalc Scan 2.6 / 5 (7) Free Oct 21, 2026 Compare
WR Mobile 4.0 / 5 (6) Free Oct 5, 2026 Compare

Compare SwiftSize with the top alternatives: ratings, updates, ASO score and keyword gaps →