Couverture de HVAC Underground

HVAC Underground

HVAC Underground

De : Randy Castricone
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HVAC Mafia is built by the trade, for the trade — techs, installers, CSRs, owners, and the apprentices coming up behind them. No corporate spin. No sales pitch dressed up as advice. Just the real conversations that happen in the truck and at the supply house.

Our podcast, HVAC Underground, goes there: field stories, the money talk nobody's honest about, the tools and brands that actually earn their spot, and what it really takes to survive and build in this trade. New episodes [every week / every other week].

If the trade's in your blood, you're already family. Subscribe and pull up a seat.

Randy Castricone Economie
Épisodes
  • Introduction to HVAC Underground

    Introduction to HVAC Underground
    Jun 14 2026

    Episode description

    Welcome to the very first episode of HVAC Underground. Before you condemn a compressor, dump in a pound of refrigerant, or tell a customer they need a whole new system — listen up. Most rookie callbacks don't come from hard jobs. They come from five service calls that look dead simple and aren't.

    In this episode we walk through the five calls new techs blow most often: what you think is happening, what's actually happening, and how to nail the diagnosis so you're not the reason the customer calls back. No fluff, no corporate spin — just the stuff you usually only learn after years on the truck.

    If you turn wrenches, read gauges, or run service calls for a living, this one's for you.

    What you'll learn

    • Why a "no cooling" call is usually airflow — not refrigerant
    • How to test a capacitor before you condemn a compressor (and pick the right microfarad)
    • What a frozen evaporator coil is really telling you — and why adding gas makes it worse
    • The low-voltage checks that save you from chasing a "dead" system for an hour
    • Why charging by gauge pressure alone is how you earn a callback
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    6 min
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