Refrigerant Leak
Losing charge, oily fittings, low pressures.
Checking Heat Pump Charge in Heat Mode: What Works in Winter
Why superheat and subcooling targets from cooling don't apply in heat mode, what manufacturers recommend for winter charging, and how to tell if a heat pump is low on charge in heating.
How to Find a Refrigerant Leak: Methods, Common Spots and the Standing Pressure Test
A step-by-step leak search for AC and heat pump systems, the leak detection methods and where each works best, the most common leak spots, and how to confirm the repair.
Mini-Split Not Cooling or Heating: A Diagnostic Order for Ductless Systems
How to troubleshoot a ductless mini-split that runs but won't cool or heat: error codes, mode and remote settings, filters and blower wheels, the outdoor unit, sensors, communication and charge.
Servicing R-22 Systems in 2026: Recharging, Retrofits and Repair-or-Replace
What you can and can't do with an R-22 air conditioner or heat pump today, where R-22 comes from now, how retrofit refrigerants work, and how to help a customer decide between repair and replacement.
Mini-Split Flare Connections That Don't Leak: Cutting, Flaring and Torque
The steps that keep mini-split flare joints leak-free, from cutting and deburring to flare size, oil, torque and nitrogen testing.