Professional AC & Mini Split Electrical Installation
Air conditioning and mini split systems require precise electrical design and professional installation. Greg Dixon, licensed master electrician with 30+ years of experience, handles all AC electrical work from design through final inspection. We serve Issaquah, Bellevue, Redmond, Sammamish, Kirkland, Renton, Mercer Island, and surrounding areas.
Air conditioning systems—whether central AC, mini splits, or heat pumps—demand robust electrical infrastructure. Proper electrical design ensures your system operates efficiently, safely, and reliably.
240V Dedicated Circuit Required
All AC units require a dedicated 240V circuit. This higher voltage is necessary for the compressor and condenser motors, which draw substantial current. Standard household 120V circuits cannot power AC systems. The circuit must be sized according to the system's amperage rating, typically ranging from 15-60 amps.
Proper Wire Gauge & Breaker Sizing
Wire must be sized correctly to avoid voltage drop and overheating. A 15,000 BTU mini split might need 20-amp service; a 24,000 BTU unit or larger central system might need 40-60 amps. We calculate proper wire gauge (10 AWG, 8 AWG, 6 AWG, etc.) and install appropriately-sized breakers in your electrical panel.
Disconnect & Safety Switch
AC units require a safety disconnect switch—either a breaker in the panel or a visible disconnect switch near the outdoor unit. This allows quick power shutoff for maintenance or emergency. Washington State electrical code mandates this safety device.
Proper Grounding & Bonding
All metal parts of the AC system must be properly grounded. We ensure the condenser frame, disconnect switch, and wiring are bonded to ground. This protects against electrical shock and lightning damage.
Conduit & Wire Protection
Wiring from the house to outdoor units must be protected in conduit, especially in areas exposed to weather or physical damage. We install rigid or flexible conduit appropriately sized for the wires and rated for outdoor use.
We have experience installing electrical systems for all AC types:
Mini Split Systems
Ductless mini splits are increasingly popular for homes without central ducts or for room-by-room comfort control. We run 240V circuits to outdoor condenser units and manage control wiring between indoor and outdoor units.
Central Air Conditioning
Traditional central AC systems require larger 240V circuits for the outdoor condenser and compressor. We integrate the air handler (indoors) and condenser (outdoors) electrically, ensuring code compliance.
Heat Pump Systems
Heat pumps provide heating and cooling. Their electrical requirements are similar to AC systems: dedicated 240V circuits and proper controls. We handle both standard and cold-climate heat pump installations.
Window & Portable AC Units
While typically 120V plug-in units, larger portable ACs benefit from dedicated 120V circuits or upgraded to 240V circuits. We can install proper outlets to eliminate extension cord hazards.
Most homeowners hire an HVAC contractor to supply and install the AC system, then call an electrician (like us) to handle the electrical work. This is the right approach. Here's how the process typically works:
1. HVAC Contractor Provides Specifications - The HVAC company provides electrical requirements: voltage (240V), amperage (30A, 40A, etc.), control wiring needs, and suggested disconnect location.
2. We Design the Electrical Circuit - We design a dedicated 240V circuit from your electrical panel to the outdoor unit location, including proper wire gauge, breaker, disconnect, and conduit protection.
3. We Pull Permits & Arrange Inspections - We obtain necessary permits from local building departments and schedule electrical inspections.
4. We Install Wiring Before Unit Placement - We run conduit and wire from the panel to the outdoor unit location before the HVAC contractor installs the condenser. This ensures proper conduit support and wire protection.
5. We Connect the System - Once the HVAC contractor installs the unit, we make the electrical connections, install the disconnect switch, and verify proper operation.
6. Coordination Is Key - Clear communication between you, the HVAC contractor, and us ensures smooth installation. We're happy to discuss timing and logistics with all parties.
Service Area
We serve all of East King County, including: Issaquah, Bellevue, Redmond, Sammamish, Kirkland, Renton, Mercer Island, North Bend, Snoqualmie, Fall City, and Maple Valley. We coordinate with regional HVAC contractors seamlessly.