Layered surge protection: not an either/or.
Point-of-use surge protectors (the strips on your AV system) and whole-house SPDs (at your panel) protect against different surge sources. The right answer is both, layered correctly.
By Steven Lockhart · Reviewed by Alex Towery, C-10 #989290
Updated 2026-06-16
Whole-house SPDs at the panel catch surges entering from utility lines (lightning, grid switching, voltage spikes). Point-of-use SPDs catch surges originating inside the home (motor switching, HVAC compressor cycling, equipment turn-on) and provide secondary protection on critical equipment. Both are needed for full coverage; one is not a substitute for the other. Combined cost: $400-$1,500 whole-house plus $50-$200 per critical equipment location for point-of-use.
01Different sources, different solutions.
Whole-house SPDs at the panel are designed to catch surges entering the building from the utility connection. These surges — caused by lightning (direct or induced), utility switching events, transformer faults, or grid disturbances — are the highest-energy events most homes experience. Panel-level SPDs sit at the entry point, shunting that energy to ground before it reaches branch circuits and equipment. They're effective at this job and inadequate for everything else.
Point-of-use SPDs (power strips, in-wall outlets, equipment-integrated SPDs) catch a different surge source: events that originate inside the home. When a motor starts (HVAC compressor, refrigerator, pool pump), it can generate brief voltage spikes that don't appear at the panel but propagate locally on the affected branch circuit. Point-of-use SPDs sit between the wiring and the equipment, clamping these local transients. They're also a secondary layer for any utility-originated surge that passes the whole-house SPD.
02Where to put point-of-use SPDs.
AV systems and home theaters
TVs, receivers, gaming consoles — sensitive electronics with high replacement cost. Quality point-of-use SPD or surge-protected outlet at the AV rack. ~$80-$200 per location. Replace point-of-use SPDs every 3-7 years (sooner if status indicators show degradation).
Computer workstations and home office equipment
Desktop computers, monitors, networking equipment, peripherals. Point-of-use SPD at the desk or in-wall surge-protected outlets. ~$50-$150 per workstation.
EV chargers, smart home hubs, server racks
Critical or expensive equipment with no graceful degradation if damaged. Dedicated point-of-use SPD at the equipment location. ~$100-$300 per location depending on equipment class.
03Building a layered protection plan.
Start with whole-house Type 2 SPD at the panel as the foundation — this is the single highest-value investment in surge protection and the prerequisite for everything else. Without it, point-of-use SPDs work alone against the largest surge events and degrade quickly. With it, point-of-use SPDs work as a designed secondary layer that lasts longer and catches what the panel-level device misses.
After whole-house is in place, add point-of-use SPDs at the locations where you have concentrated valuable or sensitive equipment: AV system, home office, network closet, EV charger, kitchen (refrigerator + induction range), HVAC condenser. The marginal cost per location is modest ($50-$200), and the locations earning their own SPD are easy to identify — anywhere with $1,500+ of equipment plugged in.
Common questions.
Does my power strip surge protector actually do anything?
Quality power strip SPDs do work — they clamp local transients and catch some utility-originated surges. The issues with relying on them alone are: (1) they're often degraded silently without status indicators showing it, (2) they're sized for typical office equipment, not the surge energy that reaches a panel-level event, and (3) they don't protect hardwired equipment (HVAC, water heater, range, smart panel). Effective for what they do, inadequate as a complete surge protection strategy.
How often do I replace point-of-use SPDs?
Every 3-7 years for residential point-of-use SPDs in normal operation, sooner if the SPD has absorbed any significant surge event or if status indicators show degradation. Quality models have visual indicators (LEDs, audible alarms) that show protection state. Budget power strips often lack indicators and should be replaced on a schedule rather than waiting for visible failure.
Will a UPS provide surge protection?
UPSs (uninterruptible power supplies) include SPD components and provide modest surge protection in addition to battery backup. For workstations and network equipment, a quality UPS provides good combined protection (battery backup + surge clamping). UPSs don't replace whole-house SPD; they're an additional layer at specific equipment locations. CyberPower, APC, and Eaton make residential-grade units in the $150-$500 range.
Can I install too much surge protection?
Not really — additional layers degrade gracefully and don't interfere with each other. The diminishing return is cost: after whole-house Type 2 and point-of-use on critical equipment, additional layers cost money without meaningful incremental protection. We typically stop at whole-house plus 4-8 strategic point-of-use locations for most homes. Larger homes with more equipment can justify more locations.
How do you handle pricing — flat fee or hourly?
Both, depending on scope. Routine service calls and predictable scope (panel replacement, EV charger install, transfer switch install, fixture replacement) are flat-fee quoted up front. Diagnostic visits and emergency scope are hourly because we don't know what we'll find. Either way, you get a written quote before work starts on anything significant, and we don't proceed beyond the quote without your sign-off.
How quickly can you schedule?
Depends on scope and season. Emergency dispatch: same-day across Marin County (1-3 hours business hours, 1-4 hours after-hours). Same-day standard service: 3-6 hours from call when capacity allows; otherwise next business day. Scheduled service work: 1-3 weeks typical. Larger projects requiring permits and PG&E coordination: 4-12 weeks depending on scope. We're upfront about timeline at the quote stage.
What warranty do you offer on work?
Our standard residential warranty: 2 years on labor, manufacturer warranty on parts (varies by product — typically 1-10 years). Major installs (panels, generators, EV chargers) often have longer manufacturer warranties (5-10 years). If there's an issue with our work in the warranty period, we come back and fix it at no cost. We also stand behind work past warranty — repeat customers and referrals matter more than a transactional fix.
Are you licensed and insured?
Yes. California State License Board C-10 Electrical Contractor #989290, in good standing. Carry general liability insurance and workers' compensation insurance as required by California law. Bondable on projects requiring it. Happy to provide proof of insurance to clients or property managers on request. License lookup: cslb.ca.gov.
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