One device at the main panel, protecting every circuit in the house. Including the most expensive appliance you own.
Every circuit
Serving Phoenix, AZ
# ROC 102297
Rated by BBB
A whole house surge protector is a device installed at your main electrical panel that intercepts voltage spikes arriving on the incoming power supply, before they reach the circuits in your house.
One device, every circuit. That is the appeal, and it is why this is the first piece of surge protection worth fitting rather than the last. A plug-in strip protects what is plugged into it. A protector at the air conditioner protects the air conditioner. A device at the panel stands between the utility and everything you own.
In Phoenix the case is monsoon lightning and summer grid stress, and the equipment most worth worrying about is the HVAC system, because it has the most expensive electronics in the house and it is energised almost continuously for five months a year.
If the air conditioner, a television and an appliance all quit in the same evening, that is a surge that came through the panel and reached every circuit. It is also the clearest possible argument for panel-level protection, since a device at the air conditioner alone would have saved one of the three.
The most expensive single failure this device prevents. Modern high-efficiency HVAC equipment is full of electronics, and a control board or motor drive on a variable-speed system is a serious repair. A storm-related failure of one of these is what makes homeowners go looking for this page.
The default state of most Phoenix homes. Nothing at the panel, nothing at the equipment, and a monsoon season every year. It is a large exposure closed by a small job.
Not one device failing repeatedly, but a pattern of different electronics dying earlier than they should. Chronic exposure to smaller transients does cumulative damage, and the sources include utility switching, neighbourhood load and your own large motors starting and stopping.
Both are the natural moment to fit this. On a new system, because you have just invested in equipment with far more electronics in it than whatever it replaced. On a panel upgrade, because the panel is already open and accessible.
More electronics and more electrical infrastructure means more exposure and more to lose. Households adding any of these usually decide protection is worth it, and they are right.
Somewhere you are not present to notice a problem is exactly where you want a device working without supervision. Worth pairing with an indicator you can check on a visit.
It gives the surge somewhere better to go than through your wiring.
The device sits at the main panel, connected across the incoming legs and to ground. In normal operation it does nothing, and it draws effectively no power. When the voltage on a line rises past a set threshold, the device becomes conductive within nanoseconds and diverts the excess energy to ground, holding what continues into the house down to a level your equipment can survive.
Two numbers describe how good one is. The surge current rating, in kiloamps, is how much energy it can absorb, and higher means longer service life and better handling of a large event. The voltage protection rating is how much voltage still gets through when it operates, and lower is better, because that is what your equipment actually experiences.
The important thing to understand about all of them is that they are consumable. A protector absorbs energy and degrades doing it. It will handle many small transients across years, or one very large event that uses it up entirely. That is not a defect, it is how the technology works, and it is why the indicator light matters.
At the main electrical panel, either wired into a breaker position inside the panel or mounted immediately beside it and connected to the busbar.
Mounting it as close to the panel as possible with the shortest practical lead length matters more than most people realise. The effectiveness of the device drops as the connecting conductors get longer, so a neatly installed device with short leads outperforms the same device fitted casually with long ones.
Some homes also have a meter-mounted device fitted by the utility. Those are worth having and they are not a substitute for a panel device, because they are typically less capable and they protect against less.
Both, and here is the honest division of labour.
The panel device stops the large external surges before they get into the house wiring. Lightning-related transients, utility switching events, anything arriving from outside. It covers every circuit.
The equipment device at the air conditioner catches the residual the panel device lets through, and it catches transients generated inside the house. Your own compressor is one of the largest motor loads in the building, and every start and stop produces its own spike that a panel device will never see because it originates downstream.
If you are doing one, do the panel. If you are doing both, the second one is the smaller job and it protects the appliance with the most to lose.
What the installation involves, assuming it is in scope:
Panel make, model and condition, available breaker positions, busbar access, and whether the panel is one of the types that should be replaced rather than added to. Grounding and bonding checked, since a surge protector diverting to a poor ground does much less than it should.
Surge current rating and voltage protection rating appropriate to the property and its exposure, and sized to the service.
Power isolated at the service, device mounted with the shortest practical lead length, connected across the legs and to ground, and the panel labelled.
Confirm the device is energised and protecting, then show you where the indicator is and what it looks like when the device needs replacing. That thirty-second explanation is the difference between a protector that gets replaced when it should be and one that sits dead in a panel for a decade.
Call (602) 437-0066 or use the form. If you are already having HVAC work done, mention it, because the equipment-side protection can be handled on the same visit.
For most Phoenix homes, yes. It is one device covering every circuit, it costs a fraction of a single HVAC control board, and monsoon season delivers the exact conditions it exists for. The honest caveat is that it is insurance rather than an improvement. You will most likely never see it work, and the year it does, it pays for itself several times over.
It sits at the main panel doing nothing until the voltage on an incoming line rises past a threshold. At that point it becomes conductive within nanoseconds and diverts the excess energy to ground, limiting what continues into the house to a level your equipment can tolerate.
At the main electrical panel, either in a breaker position inside it or mounted right beside it. Short connecting leads matter, because performance falls off as the leads get longer.
Yes, for sensitive electronics. The panel device handles the large surges coming in from outside, and a good strip or a UPS at a computer or a television handles the residual and anything generated inside the house. Layering all the way down is the correct approach, and the panel device is the layer most homes are missing.
There is no fixed lifespan, because it depends on how much energy it has absorbed. Many years of small transients, or one large event that uses it up completely. Check the indicator annually and replace it when it says to.
Typically [under two hours], including isolating the service and testing afterwards. The power is off for part of it.
Mostly, not entirely. It stops what arrives from outside, which is the majority of the risk, but it will never see the transients your own compressor generates downstream of the panel. For the most expensive appliance in the house, the equipment-level device at the disconnect is a small addition that closes that gap.
Close to straightforward in this climate. In favour: whole-house coverage from one device, no maintenance beyond an annual glance at the indicator, no running cost, and it protects equipment that keeps getting more electronic and more expensive. Against: you pay for something you hope never operates, it is consumable so it may need replacing after a big event, and it does not cover a direct strike. In a market with monsoon lightning and five months of continuous HVAC operation, that trade is a reasonable one.
CMI-AIR is the residential division of Consolidated Mechanical, a local, family-owned commercial air conditioning company with more than 30 years of experience.
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