EPA 608 Certification

Federal certification required by law for any technician working on refrigerant systems. Always ask any HVAC tech for theirs.

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Balance Point

The outdoor temperature at which a heat pump’s heating capacity equals the home’s heat loss — below this, backup heat is needed.

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Subcool

The temperature of refrigerant liquid below its condensation point at the condenser exit. The other key system-charge indicator.

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Superheat

The temperature of refrigerant gas above its boiling point at the evaporator exit. Critical for proper system charge and compressor protection.

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Defrost Cycle

Heat pumps periodically reverse to melt frost off the outdoor coil during cold weather. Normal operation, but easy to mistake for a problem.

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Short Cycling

When your HVAC system turns on and off too quickly. Burns out equipment and creates uneven comfort.

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Cracked Heat Exchanger

A safety-critical failure where the metal heat exchanger develops cracks, allowing combustion gases (including CO) to leak into the home’s air supply.

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Combustion Air

The outside air that gas furnaces and water heaters need to burn fuel safely. Inadequate combustion air is a CO hazard.

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Flame Sensor

A small metal rod that detects whether the furnace burner has actually ignited. Among the most common furnace repairs.

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Damper

A movable flap inside ductwork that controls or balances airflow to different parts of the home.

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Plenum

The large rectangular duct sections directly above (supply plenum) and below (return plenum) the furnace or air handler.

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