How does a home AC system work in Marietta?

Indoor air is pulled through the return and filter, cooled and dried at the evaporator coil, and pushed back through supply ducts. Heat is pumped outside by the compressor and released at the condensing coil. Hot afternoons and pollen-heavy springs load filters and outdoor coils quickly, especially near wooded lots.

How often should a home HVAC system be serviced in Marietta?

Once a year for cooling, ideally in spring before peak heat, plus filter changes every 1–3 months.

Which HVAC part fails most often?

Capacitors, clogged condensate drains and dirty filters cause most summer service calls. All are inexpensive to prevent.

How your home HVAC system works in Marietta, GA

A central air system moves your home's air in a loop: it pulls warm air in through the return, filters it, cools and dries it at the indoor coil, and sends it back through supply vents. The outdoor unit pumps the heat outside.

Residential HVAC system diagram showing return, supply, thermostat, coils, compressor, fan, filter, control board, blower and drain — Tap any labeled part to read how it works.

What makes Marietta homes different

Homes across Marietta (Cobb County, ZIPs 30060, 30062, 30064, 30066, 30068) range from historic homes near the Square, 1970s–1990s two-story homes in East Cobb and newer builds toward Kennesaw. Hot afternoons and pollen-heavy springs load filters and outdoor coils quickly, especially near wooded lots. That's why the same parts wear out in a predictable order here: filters and drains first, then capacitors and fans, then coils and compressors.

Neighborhoods we visit often: Marietta Square, East Cobb, Whitlock, Powers Park, Indian Hills.

The 12 parts of the system

Part	Location	What it does
Warm Air Return	air path	The warm air return is the grille and duct that pulls room air back to the air handler.
Cool Air Supply	air path	The cool air supply is the plenum, duct branches and adjustable vents that deliver conditioned air to each room.
Wall Thermostat	indoor	The wall thermostat is the system's on/off switch and brain.
Evaporator Coil	indoor	The evaporator coil is the A-shaped coil above the furnace or air handler where cold refrigerant absorbs heat from your home's air.
Condenser Fan	outdoor	The condenser fan sits on top of the outdoor unit and pulls air through the condensing coil, carrying your home's heat away.
Compressor	outdoor	The compressor is the pump in the outdoor unit that moves refrigerant through the whole system.
Condensing Coil	outdoor	The condensing coil wraps around the outdoor unit and releases the heat your system pulled out of the house.
Air Filter Access	indoor	The air filter access is the slot or door where the system's filter sits, usually beside the air handler or behind a return grille.
Control Board	indoor	The control board is the circuit board inside the air handler or furnace that turns thermostat signals into action.
Blower Motor Assembly	indoor	The blower motor assembly is the squirrel-cage fan and motor inside the air handler that moves air through the whole house.
Condensation Drain	indoor	The condensation drain is the pan, trap and PVC line that carry water away from the evaporator coil.
Ductwork	air path	Ductwork is the network of sheet-metal and insulated flex ducts that carries air between the air handler and every room.

Explore each part

Need a technician in Marietta?

Call (404) 236-6343 for HVAC repair, duct cleaning or a free assessment. HVAC services · Contact us