MasterTech

For technicians

Stuck on a unit? Tap through to the answer.

Pick the equipment, enter what you see, answer one question per step. MasterTech ranks the likely faults, tells you what to test next and flags anything unsafe. Every closed call goes on your record for the next employer.

Download on the App Store AndroidComing soon

5 free diagnostics every month. Then $9.99 a month, or nothing if your company has a plan.

See how it works
  • One card per step, with tappable answers. Not a chat box.
  • Ranked faults with a confidence score, and STOP-WORK flags when it's unsafe.
  • Customer-ready summary and a saved work order on every closed call.

How it works

It's 4pm. The unit is down. The customer is watching.

From broken unit to confirmed diagnosis in three steps.

  1. Step 1

    Tell it what you're looking at.

    Residential or commercial. AC split, heat pump, furnace, boiler, mini split, rooftop unit, walk-in, rack system, ice machine. Pick the symptom. The app only shows the ones that fit that unit.

    Unit type picker with tappable tiles: AC Split, Heat Pump, Package Unit, Mini Split, Furnace, Boiler, and a Continue button.

  2. Step 2

    Enter the readings, or just take a photo.

    Suction, head, superheat, subcool, indoor and outdoor temps. Or snap the nameplate or your gauges and MasterTech reads the numbers for you.

    Readings screen grouped into Environment, Refrigerant circuit and Equipment & notes, with fields for indoor and outdoor temp, suction, head, superheat and subcool, and refrigerant chips.

  3. Step 3

    Answer one question at a time until it's confirmed.

    Each step is one card: the single most useful test or question. Likely faults are ranked with a confidence score. Unsafe conditions stop the job. When it's confirmed, you get a customer-ready summary and a saved work order.

    Live MasterTech diagnostic step: a question card asking what the outdoor condenser coil and fan look like, with four tappable answers.

What's inside

A second set of eyes on every call.

Guided AI diagnostic

Built for the field, not a generic chatbot.

A purpose-built diagnostic engine with HVAC physics baked in: refrigerant pressure-temperature tables, superheat and subcool logic, equipment-class rules, safety rules, structured step-by-step reasoning. Explains at your level: Apprentice, Journeyman or Senior. Escalates to a stronger model on hard cases.

  • STOP-WORK flags for CO, flame rollout, burnt wiring and live-circuit risk
  • Gloves-on tap targets. Dark mode for attics.
  • Connection drops? A standard first-checks list for that unit takes over.
Live MasterTech working theory: three likely faults ranked with confidence bars — low refrigerant charge 45%, condenser airflow restriction 35%, restricted metering device 20% — each with the reasoning over the entered readings.

Your profile

Your work speaks for you.

Every closed call builds your record: calls resolved, years in the field, credentials like EPA 608 and NATE, notable work. Trust tier rises with resolved calls. Mark yourself open to work and contractors can find you and request an intro.

  • Trust Tier 1 · Getting Started → Tier 2 at 25 resolved calls
  • "Recruiters — see your profile" shows exactly what a company sees
  • Credentials are self-reported today
Technician profile: name with a seal icon, Calls resolved and Field experience counters, credential chips for EPA 608, NATE and R-410A, and a Trust Tier card.

Field tools

The calculators you'd reach for anyway, built in.

Tap in, get the number, get back to the unit.

  • P/T & SH/SC
  • P/T Chart
  • Combustion
  • Static Pressure
  • CFM / Airflow
  • Duct Sizing
  • Electrical Ohm's law
  • Recovery Time
  • PM Checklist
  • Refrigerant Log

P/T tables built from published manufacturer charts, for residential and commercial refrigerants.

Pricing

5 free diagnostics every month.

Start free, no card. Need more? Individual is $9.99 a month for 60 diagnostics. Work for a company that has a plan? You never pay.

Free

$0forever

  • 5 guided diagnostics every month, resets on the 1st
  • All calculators and field tools
  • Your tech profile and work record

Individual

$9.99per month

or $99 a year (2 months free)

  • 60 guided diagnostics a month
  • Work orders with readings, photos and a customer-ready summary
  • Everything in Free · cancel any time

On a company plan? Your company pays and your diagnostics are unlimited. Ask your contractor for the invite code. Plans are purchased on the web from the Billing screen in the app. Cancel any time.

FAQ

Straight answers.

Is it a chatbot?

Not a chat box. Each step is one card: a question with tappable answers, a reading to enter, a test to run, or a photo to take. The engine ranks the faults and picks the next most useful step. Free text is the last resort.

Which equipment does it cover?

Residential: AC split, heat pump, package unit, mini split, furnace, boiler. Commercial: rooftop unit (RTU), walk-in, reach-in, rack system, ice machine, split system, VRF. Refrigerants from R-410A, R-32 and R-454B to R-448A, R-404A and R-290.

Does it replace the technician?

No. It can't hold the gauges. It's a second set of eyes: it checks your numbers against the physics, tells you when a reading contradicts your theory, and flags unsafe conditions. The tech confirms the diagnosis and closes the call.

Do I pay if my company has a plan?

No. Plans are billed to the company, per technician. Join with your company's invite code at sign-up and your diagnostics are covered by its plan.

What about my data?

Your readings, photos and work orders are stored in your account. Contractors see their own team only. Only techs who mark themselves open to work appear in recruiter search. Delete your account from inside the app any time. Details in the Privacy Policy.