Live
Refrigerant charge
Superheat and subcooling from your pressures and line temps, compared with target superheat or the subcooling target, so the system leaves charged right.
One app. No signal required.
Readings in. Diagnosis out. Job saved.
Your techs stop juggling three apps and a clipboard. They punch in readings at the unit, HVAC TechCalc works out superheat, subcooling and temperature split against target, tells them what's probably wrong, and files the job under the customer's address. No bars needed.
- Superheat
- Subcooling
- Temperature split
- Target superheat
Built first for our own 8-tech shop: residential AC repair & install. Works in airplane mode
SHSuperheatsuction line − sat temp
SCSubcoolingsat temp − liquid line
ΔTTemperature splitreturn − supply air
TSHTarget superheatindoor WB + outdoor DB
0 barsWorks offlinesyncs when signal returns
The field workflow
Three taps at the condenser, not three apps
Everything a tech needs between pulling up to the house and closing the job, on one screen, working with zero bars.
STEP 01
Enter readings
Refrigerant, metering device, suction and liquid pressures, line temps, return and supply air. Big fields, typed in at the unit with gloves on.
Suction 118 psigLine temp 58°FReturn / supply 75 / 56°F
STEP 02
Get a likely diagnosis
Superheat, subcooling and split are checked against target. The app names the probable fault, how sure it is, and what to check first.
SH 18°F ↑ HighSC 4°F ↓ LowSplit 19°F ✓ Normal
STEP 03
Save under the address
Notes, readings and diagnosis save to the customer's address. Next visit, the history is right there for whoever rolls the truck.
1418 Calder Ave 3 visitsLast Jun 12 · charge okStatus ✓ saved
Tested in the attic, not the office.Every reading, result and note is stored on the phone first. Lose signal mid-job and nothing stops; it syncs on its own when you're back in range.
10:42 saved on device
10:51 saved on device
11:06 synced · 2 jobs
10:51 saved on device
11:06 synced · 2 jobs
What's inside
The calcs you already run, consolidated
Stop flipping between a charge app, a calculator and your notes. The HVAC math and the troubleshooting live in the same place as the job record. Two more calculators are on the way.
Live
Diagnostic logic
Feed it the numbers, get the most likely cause with a confidence label. Guides the newer techs and double-checks the veterans.
Live
Temperature split
Return minus supply air, checked against the expected range, so an airflow problem shows up before anyone touches the charge.
Live
Offline job notes
Write it up in the crawlspace, in the attic, in the dead zone. Everything syncs when the signal comes back.
Coming next
Load calculations
Size the system to the home instead of eyeballing it. Residential heat-gain math for repair and install calls.
Coming next
Airflow: CFM & static
CFM and static pressure math to catch the ductwork problems a gauge alone won't tell you.
Staying lean on purpose
What HVAC TechCalc deliberately isn't
This isn't Fieldwire, Jobber, ServiceTitan or Wrench. It's one lightweight tool that does the field work those platforms bolt on as an afterthought, and nothing else.
- No scheduling
- No dispatch
- No invoicing
- No payments
- No CRM
- No parts inventory
- No customer portal
- No multi-shop management
Pricing, down the road
Simple, per tech
Right now it's the tool our own crew uses every day. If we open it up to other small shops later, the plan stays dead simple.
Per tech
$30 / tech / month
- Superheat, subcooling, split, target superheat
- Diagnostic troubleshooting logic
- Offline-capable field job notes
- Jobs saved by customer address
- Load & airflow calcsComing next
Right now it's an internal tool for our own crew.
Built for small crews
Priced per tech, not per seat bundle or per truck. No enterprise tiers, no onboarding calls.
One app instead of three
Charge math, troubleshooting and job notes in one place you can open in a dead zone.
A decision aid
It tells you what's probable. The call, and the manufacturer's spec sheet, stay with the tech.