Mini split electrical hookup, heat pump and refrigeration wiring in Puget Sound

For HVAC contractors: the licensed electrical sub on your jobs

HB Power Electric holds Washington electrical contractor licence HBPOWPE758PO with the General (01) specialty, which covers all types of electrical and telecommunications work. The owner holds the Journey Level (01) and Electrical Administrator, General (01) certificates. Licensed and bonded, with a $4,000 electrical contractor bond under RCW 19.28.041. Owner-operated: the same person quotes the work, wires it and meets the inspector.

The electrical scope on a typical changeout looks like this.

Element	What it usually involves
Branch circuit	Dedicated 240 V circuit sized from the nameplate MCA and MOCP — often 15–20 A for a single-head mini-split, 30–60 A for multi-zone or ducted systems with electric strip heat
Disconnect	Fused or non-fused disconnect within sight of the outdoor unit, plus the liquid-tight whip into the unit
Air handler	Separate feed for the indoor unit and any auxiliary heat, wired to the interlock the manufacturer’s diagram calls for
Controls	Makeup-air and inline duct-heater control boxes: definite-purpose contactor, 24 V Class 2 transformer, thermal limit, low-voltage terminal strip
Small loads	Condensate pump power, and the 125 V service receptacle NEC 210.63 wants within 25 feet of the equipment

The thing that stalls a hookup is usually panel capacity, not the wire. A 100 A service already carrying a range, a dryer and a water heater often has nothing left for a 40 A heat pump circuit once the load calculation is run, and finding that out after the equipment is on the pad is expensive for everyone. Send a photo of the panel and the cut sheet early. Where the numbers do not work, the answer is a subpanel or a service upgrade, priced separately.

Utility money changes who can be on a job, not only what it costs. Every programme in the table below needs pre-approval before the equipment is bought, and where a programme names an installer credential it attaches to the mechanical contractor setting the equipment rather than to the electrical sub underneath it. Confirm the current terms with the utility before anyone promises a customer a number.

The Columbia City photos on this page are the straightforward version of this work: a Mitsubishi Electric mini-split condenser in Seattle, August 2026, with a new Midwest outdoor disconnect, a Cantex weatherproof junction box and liquid-tight flex into the unit. In March 2026 the owner wired a Fantech makeup-air unit and its inline electric duct heater controls — contactor, 24 V transformer, thermal limit — in a Madison Park crawlspace. That job was makeup-air, not a heat pump, and none of its photos are publishable, so it appears here in prose only.

For facilities and restaurants: rooftop and refrigeration controls

Refrigeration electrical is narrower than “commercial electrician” suggests. It is control panels and the power that feeds them: contactor and starter replacement, control transformers, fuse blocks, DIN-rail controllers, terminal strips, and the outdoor distribution that carries 208–240 V up to a rooftop or out to a pad-mounted condensing unit.

The Edmonds job below is the reference. A single-phase air-cooled condensing unit with its control compartment in a Rittal enclosure: power distribution block, fuse block, control transformer, a Carel-style DIN controller with a display, terminal strips and ground lugs, with liquid-tight conduit into the enclosure and the wiring diagram on the inside of the door. A second cabinet on the same job carries Siemens motor starters, run and start capacitors, a 230 V terminal block and fused control circuits. Feeding both is an outdoor ABB load center with two two-pole breakers and a PVC riser with an LB fitting into rigid and flexible conduit. That work was done in July 2025, before the company licence was issued on 2025-10-20, so it is the owner’s prior work rather than a company job.

What facilities and restaurant operators usually call about: walk-in cooler and freezer controls and defrost circuits, EC and ECM fan motor changes, rooftop unit disconnects and whips, hood and makeup-air interlocks in a commercial kitchen, and control panel modification when the refrigeration contractor changes the sequence and the existing panel no longer matches it.

Seattle City Light pays commercial customers $0.36/kWh saved on HVAC, heat pump, VRF and refrigeration measures, with ECM motors at $55–$140 and strip curtains at $9 per linear foot. The constraint that catches people is pre-approval: the application has to be in before the equipment is bought, and a retrofit that is already installed generally cannot be claimed afterwards. HB Power Electric can put together the electrical side of that paperwork, but the utility decides.

One limit stated plainly. HB Power Electric is one person and publishes no response-time commitment. If a case is warm and the work cannot wait, say so on the call and you will get a straight answer about when it can start.

Permits, and who pulls which one

WAC 296-46B-901 puts the electrical permit on the electrical contractor and requires it to be bought before work begins, so the schedule starts at the filing rather than at the equipment delivery. Seattle work files with SDCI, Tacoma with Tacoma Power, and the rest of the corridor with Washington L&I or with the city itself. Ten Seattle SDCI electrical permits have been issued since December 2025, nine completed and inspected, all residential.

A controls change with no new branch circuit still needs a filing of its own. A low-voltage thermostat is a separate $59.50 line on the Washington L&I fee schedule effective 2026-07-01, which is worth knowing before a sequence change gets treated as a no-permit service call.

Coverage gap worth naming: there is no photographed walk-in cooler, VRF or three-phase rooftop job on file yet. The refrigeration gallery on this page is the Edmonds condensing-unit controls work, and the heat pump proof is a residential mini-split in Seattle.