Comparison

HVAC RefCharge vs Contractor Estimate & Invoice

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HVAC RefCharge

This app helps HVAC technicians quickly calculate refrigerant superheat and subcool levels. It supports over 100 refrigerants and offers interactive adjustments for precise charging decisions. Features include atmospheric pressure adjustments and unit customization.

Highlights
  • Superheat and subcool calculations
  • Supports 100+ refrigerants
  • Interactive slider for adjustments
  • Atmospheric pressure compensation
  • Customizable input types
  • Project photo assignment
  • Email report generation
  • English/Metric unit display
Features
Read full description

The HVAC RefCharge app is a refrigerant charging calculator that allows HVAC technicians to perform superheat and subcool refrigerant charge calculations on-the-fly. This app includes pressure/temperature data for over 100 refrigerants. This is a universal app that works on both the iPhone and iPad. This app now includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 The following is a list of additional features: 1. Perform superheat refrigerant charge calculations for 100+ different refrigerants. Input the indoor wet-bulb and outdoor dry-bulb temps. to get the target superheat temperature. Then, specify the suction line temperature and pressure to get the actual superheat temperature. The difference tells you whether to charge or not. Also, the app auto-assigns the dew version of azeotropic refrigerant to superheat, if applicable. 2. Perform subcool refrigerant charge calculations for 100+ different refrigerants. Input the indoor wet-bulb and outdoor dry-bulb temps. to get the target subcool temperature. Then, specify the liquid line temperature and pressure to get the actual subcool temperature. The difference tells you whether to charge or not. Also, the app auto-assigns the bubble version of azeotropic refrigerant to subcool, if applicable. 3. Use an interactive slider control to increase or decrease all values and immediately observe calculated results. Also, the slider control allows for "incremental" changes so you can ever-so-slightly change values to observe newly calculated results. 4. Specify atmospheric pressure (other than standard 14.7 psi) so that calculated pressures are adjusted for high elevations like those in Denver and elsewhere. 5. Customize input types so that you can specify manufacturer-specified target superheat/subcool or input indoor dry-bulb/indoor relative humidity in place of indoor wet-bulb temperature. 6. Take a photo and assign it to the project 7. Send an email that includes all inputs, results, and the photo with a custom message 8. Display input and result values in either English or Metric units

About

Contractor Estimate & Invoice

This app helps contractors manage their business by creating professional estimates and invoices. It includes scheduling, contact management, and financial tracking features, all stored locally on your device.

Highlights
  • Create professional estimates and invoices
  • Client-focused scheduling and reminders
  • Integrated contact management
  • Detailed financial tracking and P&L analysis
  • Offline data storage
  • Customizable document design
Features
Read full description

Contractor Estimating & Invoicing Tool is a complete estimating, invoicing, financial and contact management app for all building construction trades. It maintains a client focused schedule of your appointments. Integrated with your client contact info you can quickly create invoices and track your important accounts. Reasonable One-Time Price There are no monthly or annual fees to use your app. Powerful invoicing function is included to create, email and print all types of sales and service invoices. Invoice entry you can visualize the completed invoice as you go. The invoice entry view all of your transactions can be tailored to the unique needs of your business. There is extensive profit & loss analysis. This comprehensive business app provides complete financial information including inventory control and Profit & Loss Info. All information is maintained on your device and there is no need for connectivity or outside servers as is common with many of the more sophisticated business apps. Highlights: Project Pro Create cost plus type estimates and invoices with multiple levels and phases. Use Craftsman and your items with included descriptions and costs. Scheduler - The calendar on steroids. Select client names from your contacts and add the service information to the appointment. Create reminders, complete and invoice the transaction, view contact management info and send confirmations. All right from the appointment. View multiple calendars & alerts Contact Management - Store notes, images and track other communications with your clients and have the in app ability to call, text, email or map without leaving your app. Labor, Parts & Supplies are maintained in the app with detailed multi-line descriptions, costs, price and units of measure & on hand quantities. These can be added on-the-fly or maintained from your stored items. Invoices are automatically created from your Estimates and support multiple payment methods. Maintain PAID and OPEN status of your invoices. Multiple sales tax rates. Your logo, detailed terms and conditions and other messages are automatically displayed. Estimates - In App Purchase required. Create detailed and professional looking estimates at the client site that may be immediately emailed or printed. Track the status of each Estimate from Draft to Email to Approved. Document Manager Document Design & Delivery- Change document formats, images, fonts, colors, and field names. Use your local language and terms. Batch deliver Printed & Email docs. Signature Capture of approved Estimates with an update of Status. Invoices and Estimates may be copied for editing and reuse with other clients. Financial Information - Is instantly available for any client, job or timeframe with just a few taps. Information may be viewed on screen or downloaded for further analysis with any spreadsheet. Help and Support - Context sensitive help shows by topic as well as how to movies. Email, text and phone support provides to help with any questions or issues. In-App Purchases Cloud Sync Automatically synchronize your information utilizing iCloud technology. This In App will keep your business info inSync and available on all your devices! Messages & Reminders Create Appointment Reminders automatically from your schedule using text or email. Profits and Reports Profits provides a complete financial system that tracks all sales, purchases and expenses. Includes ALL formatted PDF Reports that can be printed. + Spreadsheet Download Download your financial info and backup your info. Craftsman Cost Books This is the #1 info source for Construction Labor & Materials Cost Information. With over 15,000 labor and material items the info contained in these saves time required for creating project estimates and eliminates costly pricing errors. Recurring Service Repetitive Services entry and automatic weekly, semiweekly or monthly release for maintenance and other service providers.

Screenshots

HVAC RefCharge4 screens
Contractor Estimate & Invoice4 screens

Verdict

The call

The clearest difference is update cadence: Contractor Estimate & Invoice at every 3 months against HVAC RefCharge's every 11 months. Contractor Estimate & Invoice also leads on review sentiment (46% vs 33%) and price ($7.99 vs $9.99). On ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

HVAC RefCharge costs $9.99 and Contractor Estimate & Invoice $7.99 up front. HVAC RefCharge sells 1 one-off in-app purchase and Contractor Estimate & Invoice sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

HVAC RefCharge ships an update every 11 months, Contractor Estimate & Invoice every 3 months. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.

Scorecard5 real differences · 5 level
HVAC RefCharge versus Contractor Estimate & Invoice: the parameters behind the verdict, then further details
ParameterHVAC RefChargeContractor Estimate & Invoice
Price$9.99$7.99 — better
Rating—3.2 (18 ratings) — better
Positive reviews33.3% of reviews45.8% of reviews — better
Number of ratings—18 — better
Update frequencyEvery 11 monthsEvery 3 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidPaid
DevicesiPhone, iPadiPhone, iPad, iPod, Mac — better
Requires iOS17.013.0 — better
Further details — not scored
Size6 MB133 MB
Age rating+417+
DeveloperCarmel Software CorporationJZ Mobile LLC

Customer experience

HVAC RefCharge

Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

Contractor Estimate & Invoice

All ratings18 ratings
Positive55.6%
Neutral0.0%
Negative44.4%
Written reviews24 reviews
Positive45.8%
Neutral0.0%
Negative54.2%

In-app purchases

1 purchases

HVAC RefCharge

One-time1
  • HVAC Equipment Locator$9.99
10 purchases

Contractor Estimate & Invoice

One-time10
  • Messages & Reminders$3.99
  • Document Manager$3.99
  • Estimates, Bids & Quotes$4.99
Show 7 more
  • Auto Service Calls$4.99
  • Scheduler$4.99
  • Cloud Sync Secure Data Sharing$6.99
  • Profits Expenses & PDF Reports$6.99
  • All Productivity In-Apps$9.99
  • Mac User Full License$19.99
  • Craftsman NCE Cost Book$24.99

Questions

Is HVAC RefCharge free?
HVAC RefCharge costs $9.99, and also offers in-app purchases.
Is Contractor Estimate & Invoice free?
Contractor Estimate & Invoice costs $7.99, and also offers in-app purchases.
Do HVAC RefCharge or Contractor Estimate & Invoice have ads?
Neither HVAC RefCharge nor Contractor Estimate & Invoice shows ads.
Which is updated more often, HVAC RefCharge or Contractor Estimate & Invoice?
HVAC RefCharge ships an update every 11 months, and Contractor Estimate & Invoice every 3 months. Most recently, HVAC RefCharge was updated on November 1, 2026 and Contractor Estimate & Invoice on November 11, 2026.

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