Whole-home surge protection guards every circuit and device in your home from voltage spikes that can instantly destroy electronics or cause cumulative damage over time. It works at the panel level, intercepting surges before they reach any outlet or appliance — rather than relying on individual plug-in strips that only protect what’s plugged into them. For a modern home with smart appliances, an EV charger, a variable-speed HVAC system, and thousands of dollars in electronics, panel-level protection is the most cost-effective insurance available.

Where Surges Come From

Most homeowners think of lightning when they think of surges, and lightning is certainly a threat — the Denver metro area sees significant afternoon thunderstorm activity through summer, and a nearby strike can send thousands of volts through utility lines. But lightning is actually responsible for a minority of the surges that damage electronics. The larger share comes from inside the home itself:

  • Motor-driven appliances: Air conditioners, refrigerators, washing machines, and garage door openers create small voltage spikes every time they start or stop. Over months and years, these internal surges degrade sensitive circuit boards.
  • Utility switching events: When Xcel Energy reroutes power during outages or maintenance, voltage transients on the line can be large.
  • Power restoration surges: When utility power comes back on after an outage, the restoration event can send a brief spike through connected devices.
  • Neighboring loads: Large industrial equipment or even neighbors’ variable-speed motors on a shared transformer can introduce surges on the incoming line.

What’s Actually at Risk in a Modern Home

Twenty years ago, the primary risk from a surge was televisions and computers. Today, sensitive electronics are embedded in nearly everything. Your variable-speed HVAC system has a circuit board that controls its operation — a surge that destroys it means a service call and potentially an expensive control board replacement. Smart appliances, programmable thermostats, EV chargers, LED lighting drivers, and home networking equipment are all vulnerable. The total replacement cost of electronics in a typical Denver home is often $10,000–$30,000 or more when you account for the HVAC system, refrigerator, washer/dryer, home theater, computers, and networking equipment.

Why Panel-Level Protection Is Different from Power Strips

Plug-in surge protector strips protect only the devices plugged into them — and only if the surge arrives through the outlet they’re connected to. Surges can also enter through coaxial cable, phone lines, and Ethernet connections. More importantly, a surge that comes in at the panel level may have already lost significant energy by the time it reaches a plug-in strip — but the energy it retains can still damage the MOVs in the strip rapidly. Whole-house protection at the panel level catches the bulk of surge energy at the source, and individual point-of-use strips provide a second layer of protection for the most sensitive equipment.

What Done Installs

Done installs UL 1449 listed Type 1 and Type 2 surge protective devices at the main panel. A Type 1 SPD installs on the line side of the main breaker and provides protection even from direct lightning strikes to the service entrance. A Type 2 SPD installs inside the panel on the load side. The optimal approach depends on your home’s exposure, service configuration, and whether you have a detached structure or exposed service entrance. Done’s electricians size the unit to your panel and install it with proper connections and a monitoring indicator so you know the device is actively protecting.

The cost of a professional whole-home surge protector installation is modest relative to the value of what it protects. For details on what Done offers, visit our smart home and safety services page. If you’re also considering a backup power solution for outage protection, see our backup power options. For panel-related questions, our panel and wiring team is a good starting point.