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Every part, in plain English

• Variable-capacity compressorPumps refrigerant around the loop and speeds up or slows down with the weather. It's the most expensive part, so we protect it.
• Inverter boardTurns incoming power into variable-speed power for the compressor — it's why the system can ramp instead of slam.
• Communicating controlTalks with the thermostat and the air handler so the whole system runs as a team.
• Reversing valveThe heat pump's trick: it flips which way the refrigerant flows, switching the system between cooling and heating.
• Electronic expansion valveMeters exactly how much refrigerant flows, adjusting constantly as conditions change.
• AccumulatorA small tank that keeps liquid refrigerant out of the compressor, which only wants vapor.
• Outdoor fan & motorPulls air across the coil and out the top, slowing down when it can so it runs quieter.
• Outdoor coilThin aluminum fins trade heat with the outdoor air. Cottonwood fluff and grass clippings clog them and make the whole system work harder.
• Service valvesWhere the copper lines connect to the outdoor unit — and where we check the system's pressures.
• Vapor line (the big one)Insulated copper. Carries cool refrigerant back outside in summer — and hot refrigerant into the house in winter.
• Liquid line (the small one)Bare copper that carries liquid refrigerant between the indoor and outdoor units.
• Air filterCatches dust before it reaches the coil and blower. If it looks like a carpet, it's time for a new one.
• Variable-speed blowerMoves air through your ducts — softly most of the time, faster only when it's needed.
• Backup heat stripsElectric elements that help on the coldest days, and act as emergency heat if the heat pump is ever down.
• Indoor coilCold in summer, warm in winter. Summer humidity condenses on its fins and drips into the drain pan.
• Refrigerant sensorNewer refrigerants call for a leak sensor at the coil. If it ever detects a leak, the system runs the blower and shuts the compressor off until it's fixed.
• Drain pan & lineCarries away the water your system pulls out of the air. A clogged line can shut the system down or leak.
• Air handler controlListens to the thermostat and sets the blower speed and backup heat.
• Communicating thermostatTells the whole system when to run and how hard — not just on or off.

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Illustration · Armstrong Air A7CP21V Pro Series heat pump + 7AH2AV air handler