Professional HVAC/R reference, certification study, and field tools. 100% offline. No internet required on the job. Works in basements, attics, mechanical rooms — anywhere.
Stop piecing together apps, charts, and Google searches on the job. ColdCase puts everything in one place — offline, fast, and built for real field work.
Need more than one? Check the suite bundles below — you'll save up to $33/month.
One key unlocks all apps in your suite. Save up to $33/month vs buying individually.
From superheat and subcooling to PT charts, airflow, and electrical — every tool built around real job site problems.
Calculate target superheat for fixed orifice and TXV systems. Subcooling calculator for all major refrigerants. Supports R-22, R-410A, R-32, R-454B, R-407C, R-404A, and 80+ more. Built for diagnosing charge issues fast.
Pressure-temperature charts for every refrigerant you'll encounter in the field. R-22, R-410A, R-134a, R-404A, R-507, R-32, R-454B, R-448A, R-449A, R-290, CO2, Ammonia, and dozens more. No internet required.
CFM calculator, duct sizing tool, static pressure calculator, return air sizing, and delta-T airflow calculator. Everything you need to size and diagnose airflow problems on residential and commercial systems.
Amp draw calculator, capacitor sizing, voltage drop, Ohm's law solver, motor FLA/MCA/MOCP calculator, wire sizing, 3-phase power, and voltage imbalance. Daily-use tools built around real electrical problems in the field.
Symptom-based diagnosis guides for low suction pressure, high head pressure, evaporator coil freezing, compressor not starting, short cycling, and more. Fault codes for 38 brands covering residential, commercial, and mini-split systems.
1,053+ questions covering Core, Type I, Type II, and Type III. Flashcards with spaced repetition, adaptive quiz engine, mock exams timed at 90 minutes, and a 28-day study plan. The most complete offline EPA 608 study tool available.
Superheat is the temperature difference between the actual suction line temperature and the refrigerant's saturation temperature at the measured suction pressure. For fixed orifice systems, use the AHRI method — measure outdoor dry bulb and indoor wet bulb, then reference the target superheat chart. ColdCase Pro does this calculation automatically for 80+ refrigerants.
A pressure-temperature (PT) chart shows the saturation temperature of a refrigerant at a given pressure. Find your suction or discharge pressure on the left column, then read across to find the corresponding saturation temperature. Subtract from your actual line temperature to get superheat (suction side) or subcooling (liquid line).
Low suction pressure is typically caused by low refrigerant charge, a restricted metering device, low evaporator load (dirty filter, low airflow, frozen coil), or a faulty compressor. High superheat combined with low suction pressure points to undercharge or restriction. ColdCase Pro's troubleshooting guides walk through every cause step by step.
The most common field method: CFM = BTU/hr ÷ (1.08 × ΔT), where ΔT is the temperature difference between supply and return air. Alternatively, use a flow hood or calculate from duct velocity × duct area. ColdCase Pro's airflow calculator handles all three methods.
Subcooling is the temperature difference between the liquid refrigerant temperature and its saturation temperature at the condensing pressure. Proper subcooling (typically 10–20°F for TXV systems) ensures a full liquid column at the metering device. Low subcooling often indicates undercharge or excessive heat gain in the liquid line.
Most HVAC apps were built by software companies. ColdCase Pro was built by a working Nevada commercial refrigeration tech who needed it on the job.
Disclaimer: ColdCase Pro tools are field references for qualified HVAC/R technicians.
Always verify calculations against manufacturer specifications, equipment nameplates, and applicable local codes.
Results assume standard conditions — altitude, refrigerant blend, and equipment condition may affect accuracy.
Not a substitute for proper training or EPA certification.
Found an error or missing feature? Email us at
support@coldcasepro.com and we'll fix it.