Walk through your house and count what plugs in: the refrigerator with its control board, the furnace or heat pump with its circuit boards, the washer, the dryer, the range, the microwave, the televisions, the computers, the router that your entire household’s work and school depend on, the garage door opener, the thermostat, the doorbell camera. Modern homes are electronics all the way down — even the “appliances” are computers with motors attached. Now ask: what stands between all of it and the next voltage surge?
For most homes, the honest answer is a couple of aging power strips behind the TV. That is not protection; it is a rounding error. Here is what our licensed electricians at Chamberlin Electric want New Hampshire homeowners to understand about surges, and how layered, professionally installed protection actually works.
What a Power Surge Is — and Where They Really Come From
A surge is a brief spike in voltage above what your wiring and devices are designed to receive. The dramatic cause everyone pictures is lightning — and New Hampshire’s summer thunderstorms deliver plenty — but a direct strike is actually the rare case. A strike does not need to hit your house to hurt it: lightning striking utility equipment or ground even some distance away can drive damaging transients down the lines and into every home on the circuit.
The bigger surprise is that a large share of surges originate inside your own home. Every time a major motor cycles — the well pump, the AC condenser, the sump pump, the refrigerator compressor — it can kick small transients back into your wiring. Utility grid switching, transformer operations, and the messy moments when power is restored after an outage add more. Individually these small surges are survivable; cumulatively, they age electronics the way waves age a seawall, degrading components until one day the furnace board or the TV simply dies “for no reason.” The reason was years in the making.
Why Power Strips Alone Cannot Do the Job
Point-of-use surge protectors — the good ones, not bare power strips — have a real role, but three built-in limits. First, coverage: they defend only what plugs into them, which leaves every hardwired system undefended — the furnace, the heat pump, the range, the dishwasher, the well pump, the garage door opener. The most expensive electronics in your house do not plug into a strip behind the couch. Second, capacity: plug-in protectors are sized for residual, indoor-scale transients, not for the heavy events that arrive on the service lines. Third, mortality: surge components sacrifice themselves absorbing hits and degrade with each one, and most people have no idea whether the five-year-old strip under the desk still protects anything at all.
None of this makes point-of-use protection worthless — it makes it the second layer of a system, not the system.
New Hampshire adds one more wrinkle worth naming: our outage-and-restoration rhythm. Every storm season, homes across the state go through repeated cycles of power loss and restoration, and the moment electricity returns is one of the most surge-prone events a home experiences — voltage stabilizing, transformers energizing, and every motor in the neighborhood restarting at once. The regions that lose power most often are, by that same fact, the regions whose electronics endure the most restoration transients. If your street sees several outages a year, your equipment is living a harder electrical life than the identical equipment two towns over — and it deserves protection sized for that reality.
How Whole-Home Surge Protection Works
A whole-home surge protective device (SPD) installs at your electrical panel — the front door for power entering your house — and stands guard over every circuit at once. When voltage spikes beyond safe thresholds, the device diverts the excess energy safely to ground in a fraction of a second, clamping the surge before it propagates through your wiring to the furnace board, the appliances, and the electronics on every floor.
Professionals talk about SPDs in types, which really describe where they sit in the system: Type 1 devices install at or near the service entrance and handle the heaviest externally sourced events; Type 2 devices install at the panel and are the standard whole-home workhorse; Type 3 devices are the point-of-use protectors at your outlets. Recent editions of the National Electrical Code have moved toward requiring surge protection in new and upgraded dwelling services — a strong signal of where the industry has landed on whether this is optional. Best practice is layered: a panel-level SPD absorbs the big events, and quality point-of-use protectors mop up what little gets through to your most sensitive electronics.
Installation is a licensed-electrician task — the device connects at live service equipment and must be matched to your panel and grounding system, and its effectiveness depends directly on the quality of that grounding. It is a quick professional visit, and it pairs naturally with a panel upgrade if one is on your horizon anyway.
The New Hampshire Math: What You Are Protecting Against
Add up a realistic worst day: a heat pump or furnace control board, a refrigerator, a range, a washer and dryer, two televisions, computers and monitors for two remote workers, and the networking gear underneath all of it. Replacement value runs well into five figures — and that is before counting the disruption of a dead furnace in January or a fried well-pump controller with a family that would like to shower. Homeowners insurance may cover a catastrophic lightning claim, minus your deductible and your time; it does nothing about the slow cumulative damage that simply shortens the life of everything you own.
Against that exposure, a professionally installed whole-home SPD is one of the least expensive meaningful upgrades in residential electrical work — typically a few hundred dollars installed in most straightforward cases. Few line items in home ownership buy this much protection per dollar.
Two local notes worth adding. First, generator owners: outage-and-restoration cycles are surge-rich moments, and a standby generator system deserves surge protection on the systems it works so hard to keep alive. Second, business owners: everything above applies double to commercial spaces full of point-of-sale systems, servers, and specialized equipment — our commercial electrical team designs protection for those environments as well.
What Installation Day Looks Like
Homeowners are often surprised by how undramatic this project is. For a standard Type 2 panel-mounted SPD, a licensed electrician arrives, de-energizes the panel safely, mounts the device at or beside the loadcenter, lands its conductors on an appropriately positioned breaker and the grounding system, verifies the installation and the status indicators, and restores power — commonly within an hour or two, with only a brief outage while the panel is open. We also evaluate the grounding electrode system while we are there, because an SPD is only as good as the ground path it diverts energy into; older homes sometimes need grounding improvements that are worth doing regardless.
If your panel is crowded, obsolete, or already on the replacement list, we will tell you plainly and price the combined project — an SPD installed during a panel upgrade adds minimal labor. Either way you receive documentation of the device, its ratings, and the installation for your home records, which is useful for insurance and resale alike. Afterward, your involvement drops to an occasional glance at the status lights and a mention to us at any service visit; we verify the device whenever we are in your panel.
Signs You Should Act Sooner Rather Than Later
- You have lost electronics or appliance boards to storms before — your location may see more line-borne events than average.
- You are on a well pump: that big motor cycles thousands of times a year, generating internal transients each time, and its own controller is itself surge-vulnerable.
- You have installed — or are installing — a standby generator, solar, an EV charger, mini-splits, or a heat pump: major investments in exactly the equipment surges kill.
- Your home office is mission-critical: when your income flows through the router, the router deserves layered protection.
- You are already upgrading your panel: adding an SPD during the upgrade is the cheapest it will ever be, and current code practice increasingly expects it.
- Your “protection” is a strip you cannot remember buying: assume it is done and plan a real system.
Frequently Asked Questions
Is whole-home surge protection really worth it?
For nearly every modern home, yes. The device costs a small fraction of a single furnace control board, protects every circuit including hardwired appliances that power strips can never cover, and defends against the cumulative everyday surges that quietly shorten equipment life. It is among the best value-per-dollar upgrades in residential electrical work.
Does a whole-home surge protector stop lightning?
A direct lightning strike to a structure is an extraordinary event no device can fully tame. What a quality SPD does exceptionally well is clamp the far more common events — nearby-strike transients arriving on utility lines, grid-switching surges, and internally generated spikes — which cause the overwhelming majority of real-world surge damage. Layering point-of-use protectors adds a final safeguard for sensitive electronics.
How long does a whole-home surge protector last?
SPDs sacrifice capacity with each event they absorb, so lifespan depends on what your location throws at them — commonly many years. Quality units include status indicators showing they remain protective, and we check them during electrical service visits. After a known major event, have the device inspected.
Can I install a surge protector myself?
Panel-mounted SPDs connect at energized service equipment and must be properly matched and grounded — this is licensed-electrician work, both legally and practically, since the device’s performance depends on correct installation and grounding quality. Point-of-use protectors, by contrast, are plug-in consumer devices anyone can deploy.
Do surge protectors help with brownouts or flickering lights?
No — surges are overvoltage events, while brownouts and dimming are undervoltage symptoms with entirely different causes, some of which (loose service connections, failing neutrals) are serious. If your lights routinely dim or flicker, that is a diagnostic call, not a surge problem; our electricians can find the cause.
I have a generator — do I still need surge protection?
Arguably more than anyone. Outages and restorations are surge-prone moments, and your generator exists to keep expensive, electronics-laden systems alive through them. Protecting those systems at the panel completes the resilience picture your generator started.
Protect Everything That Plugs In — and Everything That Doesn’t
Your home runs on sensitive electronics from the basement to the doorbell, and one unprotected surge event can cost more than a decade of protection would have. Chamberlin Electric’s licensed electricians install whole-home surge protection across New Hampshire and Massachusetts, standalone or bundled with panel upgrades and generator projects — with the workmanship we have staked our name on since 1989.
Call (603) 595-9473 or request a quote online, and give every circuit in your house a bodyguard.