The 11 best HVAC apps for service engineers

Running an HVAC business in the UK means keeping up with Fluorinated Gas (F-Gas) recording requirements, reducing paperwork, and making sure your engineers have the right tools on-site. The best HVAC apps can help you manage jobs, run refrigerant calculations, size ductwork, and stay compliant, all from a mobile device.

Whether you need a full HVAC mobile app for managing your field team or a free calculator for quick on-site checks, this list covers 11 of the most useful options for UK service engineers. We have grouped them by purpose: business management, field tools and calculators, and utility apps. Some are free HVAC apps, while others require a subscription or one-off payment. The comparison table below gives you a quick overview before we break each one down.

List item 1: Joblogic

Platform & price: iOS & Android | From £39/month

Joblogic is a UK-built field service management platform designed for HVAC businesses. The HVAC software gives you an all-in-one system to schedule, track, and manage your engineers from a single dashboard.

The mobile app works offline, so your engineers can complete jobs, capture signatures, and fill in compliance forms even without a signal on-site. Data syncs automatically once connectivity returns.

You can manage planned preventive maintenance (PPM) contracts to keep recurring service schedules on track. Engineers can scan QR codes on equipment to pull up full service history instantly.

Digital compliance forms replace paper for F-Gas records, risk assessments, and safety certificates. Back in the office, drag-and-drop scheduling lets your team assign and rearrange jobs in real time. The app is available on iOS and Android.

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List item 2: CompanyCam

Platform & price: iOS & Android | Free (paid plans available)

CompanyCam helps your field team document every job with photos, sorted automatically by job location. This makes it easy to reference images by job site without digging through camera rolls or email threads.

Engineers can comment on photos, leave voice notes, and tag colleagues, similar to how social media works. Managers get a visual overview of daily operations without chasing updates over the phone. By documenting jobs with photographic evidence, you can also reduce disputes with customers.

List item 3: Bluon HVAC

Platform & price: iOS & Android | Free

Bluon is a popular HVAC troubleshooting app, offering step-by-step diagnostic guides, refrigerant data, and R-22 replacement information. The app covers a broad range of systems and includes a community feature where engineers can ask questions and share solutions.

Note that Bluon primarily covers North American refrigerant data. It is still useful for engineers working with imported equipment, but if you are working in the UK, you should verify refrigerant compliance against local F-Gas regulations.

List item 4: HVAC Buddy

Platform & price: iOS & Android | £9.99 one-off

HVAC Buddy is a practical on-site reference tool for refrigerant charge calculations. It covers superheat, subcooling, and airflow metrics across a wide range of refrigerant types. You can run calculations on-site and email the results directly to your office or customer as a report.

The one-off price means there is no ongoing subscription to manage, making it a cost-effective addition to your toolkit.

List item 5: HVAC Check & Charge

Platform & price: iOS & Android | Free

HVAC Check & Charge provides quick subcooling, superheat, and airflow calculations without any setup. It supports a range of common refrigerants including R-22, R-410A, R-32, and R-407C. You enter the system temperatures and environmental loads, and the app returns the correct charge within seconds.

If you need a fast, free way to check charge levels on-site without carrying printed charts, this app does the job. It is available on both iOS and Android at no cost.

List item 6: HyTools

Platform & price: iOS & Android | Free

HyTools is developed by IMI Hydronic Engineering, a European manufacturer. That means the unit conversions and standards are well-suited to UK and EU systems. The app handles valve sizing, radiator power estimation, and pressure drop calculations for hydronic heating and cooling installations.

If your work involves balancing or commissioning hydronic systems, HyTools gives you reliable reference data on-site without carrying printed tables.

List item 7: iManifold

Platform & price: iOS & Android | Free

iManifold supports over 40 refrigerant types and provides live system performance analysis. You can measure superheat, subcooling, and target values, then compare them against manufacturer specifications. The app also includes a savings analysis feature that estimates the cost impact of system inefficiencies.

For engineers who need a reliable HVAC troubleshooting tool on-site, iManifold is a strong free option with a clear interface.

List item 8: Duct Calc Elite

Platform & price: iOS & Android | From £5.83 one-off

Duct Calc Elite handles ductwork sizing calculations with a clean, intuitive interface. You input your airflow requirements and the app returns recommended duct dimensions, covering both round and rectangular options.

Getting duct sizing right on the first pass avoids noise issues, pressure drops, and costly rework later. The app is particularly useful during installation surveys where you need to verify dimensions before ordering materials.

List item 9: HVAC Duct Sizer

Platform & price: iOS & Android | From £0.99 one-off

HVAC Duct Sizer offers two modes: find duct size by airflow requirement, or find size by entering specific dimensions. The first mode presents both exact and rounded estimations for height, width, and diameter. The second lets you examine an existing duct system by entering current dimensions to calculate friction loss.

This flexibility makes it useful whether you are designing a new system or checking existing ductwork against required capacity. At under a pound, it is one of the cheapest tools on this list.

List item 10: Refrigerant Slider

Platform & price: iOS & Android | Free

Refrigerant Slider is developed by Danfoss, a European engineering company. The app covers 69 refrigerants and provides pressure-to-temperature conversion alongside Global Warming Potential (GWP) and Ozone Depleting Potential (ODP) data for each type.

Because Danfoss is a European manufacturer, the data and standards align well with UK and EU refrigerant requirements. If you need to quickly look up PT values or check the environmental classification of a refrigerant on-site, this app is a reliable single-purpose reference tool.

List item 11: MeasureQuick HVAC

Platform & price: iOS & Android | Free (paid plans available)

MeasureQuick connects to Bluetooth instruments and captures system measurements automatically. The app stores data in the cloud, so you can access inspection records from any device. You can also share measurement reports with office managers, making it easy to keep everyone aligned on system performance.

The free version covers basic measurement and reporting. Paid plans add advanced diagnostics and verification features.

Conclusion

The right combination of HVAC apps can help your engineers work faster, stay compliant, and spend less time on admin. From refrigerant calculators to full job management platforms, each app on this list solves a specific problem on-site or in the office.

If you are looking for a single platform to manage scheduling, compliance, and field operations, explore Joblogic's HVAC management software. You might also find our guide to the best apps for plumbing businesses useful if your team works across both trades.

Ready to see how it works? Book a demo with one of our specialists, who will walk you through the platform and show you how it fits your HVAC business.

Frequently asked questions

What is the best HVAC app?

It depends on what you need. For managing jobs, scheduling, and compliance in the UK, Joblogic is the leading all-in-one option. For field calculations, HVAC Buddy and HVAC Check & Charge are the most popular choices.

Are there free HVAC apps?

Yes. Several of the best HVAC apps are free to download. HVAC Check & Charge, HyTools, iManifold, Bluon HVAC, Refrigerant Slider, and MeasureQuick HVAC are all available at no cost on iOS and Android.

What are the best HVAC troubleshooting apps?

For system diagnostics and troubleshooting, iManifold and MeasureQuick HVAC are the strongest options. Bluon HVAC also includes troubleshooting guides and R-22 replacement data.

Do HVAC apps work offline?

Some do. Joblogic's mobile app is designed for offline use. Engineers can complete jobs, capture signatures, and fill in compliance forms without a signal. Data syncs automatically once connectivity is restored.