Field calculators

HVAC calculators that don't ask for your email.

Built for the truck. Type a couple inputs, get a real answer. No signup, no per-report fee, no upgrade pop-ups.

Refrigerant Charge Diagnosis

Gauge pressures + line temps in → superheat, subcooling, and an undercharge / overcharge / restriction verdict.

Full verdict Open →

Target Superheat Lookup

Wet-bulb and outdoor temp in, target superheat out. For fixed-orifice systems.

1-input calc Open →

Interactive PT Chart

Pressure ↔ saturation temp for R-410A, R-32, R-22, R-454B.

4 refrigerants Open →

Capacitor Tolerance Check

Rated and measured MFD in, pass/fail with ±6% threshold out.

1-click verdict Open →

Capacity Estimator

Square footage → rough BTU sizing. Ballpark before you run real Manual J.

Rough-cut sizing Open →

Manual J Load Calculator

Full ASHRAE-based residential load calc + Manual D duct sizing + customer-ready PDF. Free, no per-report fee. Runs on its own subdomain at loadcalc.launchmyhvac.com.

Customer-ready PDF Open →