HVAC Toolkit Pro is the essential all-in-one field reference for HVAC technicians, appliance repair professionals, and DIY enthusiasts. Whether you're fixing an air conditioner, refrigerator, washing machine, or diagnosing complex HVAC system issues, this toolkit puts everything you need right in your pocket.

=== FREE FEATURES ===

• ERROR CODE DATABASES - Look up error codes for ACs, refrigerators, and washing machines from major brands. Includes searchable PDF service manuals for 40+ washing machine brands (Bosch, LG, Samsung, Whirlpool, GE, Miele, and more).

• WIRING DIAGRAMS - Browse 50+ AC wiring diagrams, system schematics, and electrical component diagrams. Perfect for understanding complex circuits in the field.

• SIZING CHARTS & REFERENCE - Quick access to compressor size charts, capacitor sizing (tonnage to microfarads), overload relay identification, compressor HP codes by brand, and parts reference.

• HVAC CALCULATORS - BTU/Ton/HP converter, unit conversion calculator, and general HVAC calculator for quick field calculations.

• REFRIGERANT DATA - Pressure charts for R-22, R-32, R-410A, R-134a, R-404A, R-407C, R-600a, R-290, R-417A and more.

• PCB REFERENCE - Educational content on printed circuit board types with diagrams.

• APP CONNECT DIRECTORY - Searchable directory of 40+ HVAC/appliance brand apps with connection methods (AP Mode, QR Code, Bluetooth, IR Controller, Thermostat App) and step-by-step connection guides.

• HVAC FULL FORMS - Comprehensive acronym dictionary for HVAC terminology.

=== PRO FEATURES (Subscription Required) ===

Unlock all 13 professional tools with a monthly or yearly subscription:

1. SUPERHEAT & SUBCOOLING - Calculate superheat and subcooling for TXV and fixed orifice systems with accuracy.

2. PT CHART - Interactive pressure/temperature chart for 30+ refrigerants with interpolation.

3. DUCT SIZING - Calculate round and rectangular duct sizes from CFM and friction rate.

4. PSYCHROMETRICS - Psychrometric calculator for relative humidity, dew point, and enthalpy.

5. LOAD CALCULATION - Simplified Manual-J residential load calculator (BTU/hr and tons).

6. PIPE SIZING - Pipe sizing for water, natural gas, propane, and low-pressure steam.

7. SYSTEM PERFORMANCE - Airflow (CFM) calculator, BTU output measurement, and capacitor under-load test.

8. UNIT CONVERTER - HVAC-specific unit converter (Power, Flow, Temperature, Pressure, Length).

9. DIAGNOSTICS - Error code lookup for Carrier, Trane, Lennox, Rheem, Goodman, York. Diagnostic wizard covering 9 common symptoms. Mini-split diagnostics for Mitsubishi, Daikin, LG, Fujitsu, and Bosch.

10. REFERENCE TOOLS - Steam tables, R-Value/U-Value reference, sheet metal offset calculator, ASHRAE 62.2 ventilation calculator.

11. ELECTRICAL TOOLS - NEC voltage drop calculator and wire sizing per NEC Table 310.16.

12. HYDRONIC CALCULATOR - Flow from BTU, BTU from flow, valve Cv, and pressure drop calculations.

13. EPA TOOLS - EPA 608 leak rate calculator and refrigerant usage logbook.

=== ADDITIONAL FEATURES ===

• Service Reminder - Schedule and manage customer service call reminders with local push notifications.
• Theme Support - Light, Dark, and System theme modes for comfortable use day or night.
• In-App Updates - Stay current with the latest features and improvements.