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Best Subcooling Apps

100+ iOS apps curated and reviewed

4.0 avg rating
18 free apps
Updated September 2026

Finding the right subcooling apps can be overwhelming with so many options. We've analyzed 100+ apps to bring you the best choices for 2026, from free options to premium solutions with advanced features.

Compare top Subcooling Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1SuperCool Slide Rule HVACSuperCool Slide Rule HVACFree4.2β˜… (185)NoNoAug 2026
2HVACR Check & ChargeHVACR Check & ChargeFree4.8β˜… (17K)NoNoSep 2026
3SuperHeatCalcSuperHeatCalcFree3.8β˜… (6)NoNoMay 2026
4Ref ToolsRef ToolsFree3.9β˜… (52)NoNoSep 2026
5P-T CalculatorP-T CalculatorFree4.8β˜… (52)NoNoAug 2026
6Superheat & Subcool CalcSuperheat & Subcool Calc$0.993.0β˜… (2)NoYesSep 2026
7PT Chart Refrigerants EUPT Chart Refrigerants EUFree3.7β˜… (3)NoNoMay 2026
8HVAC AI: Tools & SimulatorHVAC AI: Tools & SimulatorFreeβ€”NoYesAug 2026

Top Picks for Subcooling

SuperCool Slide Rule HVAC#1

SuperCool Slide Rule HVAC by Designstein, llc

Editor's Choice
πŸ”§ Utilities
4.2😐(185 ratings)
Free
SuperCool Slide Rule HVAC screenshot 1
SuperCool Slide Rule HVAC screenshot 2
SuperCool Slide Rule HVAC screenshot 3
SuperCool Slide Rule HVAC screenshot 4
SuperCool Slide Rule HVAC screenshot 5

This app offers a comprehensive suite of tools for HVAC technicians. It provides interactive guides, step-by-step repair instructions, and calculators for various HVAC calculations including superheat, subcooling, and duct sizing.

What We Love

  • πŸ‘ Great HVAC tool
  • πŸ‘ Informative slide rule
  • πŸ‘ Helpful for new techs
  • πŸ‘ Quick and simple
  • πŸ‘ Easy to use
  • πŸ‘ All in one app
  • πŸ‘ Invaluable in the field
  • πŸ‘ Pocket reference
  • πŸ‘ Good for duct sizing
  • πŸ‘ Helps customers understand issues

Room to Improve

  • πŸ› Trial period issues
  • πŸ› App expires frequently
  • πŸ› Requires re-download
  • πŸ› Not worth the trouble
  • πŸ› App messed up
  • πŸ› Scrambled charts
  • πŸ› Junk app
  • πŸ› Paid version still has issues
  • πŸ› Free not free
  • πŸ› No cost upfront
  • πŸ› No way to purchase
  • πŸ› Closes itself
  • πŸ› No portrait mode
  • πŸ› No friction rate selection
  • πŸ› No quick duct sizing
  • πŸ› Inaccurate altitude
  • πŸ› Room calc issues
HVACR Check & Charge#2

HVACR Check & Charge by Copeland LP

PT Charts Superheat Subcooling
Strong Contender
πŸ” Reference
4.8😊(17K ratings)
Free
HVACR Check & Charge screenshot 1
HVACR Check & Charge screenshot 2
HVACR Check & Charge screenshot 3
HVACR Check & Charge screenshot 4
HVACR Check & Charge screenshot 5
HVACR Check & Charge screenshot 6

This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.

What We Love

  • πŸš€ Convenient
  • πŸš€ Great program
  • πŸš€ Reliable app
  • πŸš€ Easy and quick charging reference
  • πŸš€ Helps take away doubt when making a case
  • πŸš€ Quickly analyzes conditions and factors
  • πŸš€ Awesome Freon charging app
  • πŸš€ Revolutionary app
  • πŸš€ Very handy and easy to use
  • πŸš€ Best helper ever
  • πŸš€ Makes charging systems super easy
  • πŸš€ Very good for superheat calculation
  • πŸš€ Great reference
  • πŸš€ Most accurate charge for R410A and R22
  • πŸš€ Easy to use

Room to Improve

  • πŸ› Pressure settings not helpful
  • πŸ”’ Concerning privacy policy
  • πŸ› Restricted temperature range
  • πŸ› Crashes and bugs
  • πŸ› Doesn't work on Apple Watch

More Subcooling apps to explore

FAQ about Subcooling

What are the best subcooling apps for iPhone?
SuperCool Slide Rule HVAC tops our subcooling apps ranking as of September 2026, with a 4.2-star average from 185 App Store ratings, and it's free to download.
Yes β€” 18 of the top subcooling apps we rank are free to download, including SuperCool Slide Rule HVAC and HVACR Check & Charge.
SuperCool Slide Rule HVAC has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 100+ subcooling apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
This app provides HVAC technicians with a comprehensive set of tools for diagnosing and solving complex HVAC problems. It offers interactive guides, on-screen instructions, and step-by-step repair assistance for various tasks.
Key features include superheat and subcooling charging calculations for popular refrigerants with corrective actions, duct sizing and layout calculators for different duct types, a compressor windings troubleshooter, and various HVAC conversion tools.