5 HVAC Troubleshooting Apps Every Service Tech Needs

Being an HVAC technician in 2025 means more than having a stocked toolbox—you also need smart tech that travels with you. Today’s top HVAC pros rely on mobile apps to boost efficiency, troubleshoot faster, and deliver better service. Whether you’re calculating subcooling on-site or referencing refrigerant specs, having the right app can save time and money on every job.

With hundreds of HVAC apps on the market, it’s tough to know where to start. So, we’ve curated a 2025 update of the top 5 HVAC troubleshooting apps to help field technicians stay sharp, save time, and stay competitive.

1. HVAC Check & Charge by Emerson

A tried-and-true essential, HVAC Check & Charge continues to deliver as a free, mobile refrigerant charge calculator for:

• R-22, R-410A, R-32
  
• R-407C, R-134a
  
• R-452B, R-438A (and more)
  

Ideal for quick system checks in the field, this app is perfect for techs needing accurate superheat/ subcooling calculations on the go.

Free | iOS & Android

2. MeasureQuick HVAC

One of the most advanced diagnostic tools on the market today, MeasureQuick integrates with popular Bluetooth HVAC tools (like Testo, Fieldpiece, and iManifold). It compiles readings, diagnoses issues, and provides actionable insights in real time.

• Supports wireless tools
  
• Real-time system performance analysis
  
• Streamlines system commissioning and service calls
  

Free with in-app purchases | iOS & Android

3. HyTools

Still a go-to for hydronic system professionals, HyTools offers a full suite of calculators:

• Pipe & valve sizing
  
• Radiator power estimation
  
• Unit conversion & multilingual support
  
• Flow & pressure calculations for hydronic systems
  

Updated regularly and incredibly versatile, HyTools is ideal for both new and seasoned hydronic techs.

Free | iOS & Android

4. Bluon HVAC

More than a troubleshooting app, Bluon is a full-service resource hub. It provides step-by-step repair guidance, technical documentation, and even live 24/7 support from HVAC pros.

• Built-in refrigerant database
  
• System-specific wiring diagrams
  
• Access to manuals, part numbers, and how-to videos
  
• Real-world advice from fellow technicians
  

Free (with account setup) | iOS & Android

5. HVAC Buddy

Still relevant in 2025, HVAC Buddy remains a solid choice for refrigerant charging and diagnostic tools:

• Superheat and subcooling calculators
  
• TEET and Delta-T readings
  
• Includes 100+ refrigerants
  
• Supports IP and SI units
  

While other tools may be flashier, HVAC Buddy’s simplicity and reliability still win it a place in many techs’ digital toolbox.

One-time $9.99 | iOS & Android

Pro Tip: Use RazorSync to Supercharge Your Service

Pair your favorite HVAC troubleshooting app with RazorSync’s award-winning field service software to run your business more efficiently. RazorSync helps HVAC companies streamline:

• Scheduling and dispatching
  
• Invoicing and mobile payments
  
• Customer communication
  
• Technician tracking
  

With a single platform accessible from any device, you’ll spend less time on admin tasks and more time growing your business.

Ready to optimize your workflow?

Schedule your free live demo today and see how RazorSync can help you deliver better, faster service—every time.