Smoke Detector & CO Alarm Installation
Smoke Detector & CO Alarm Safety in Marin, Sonoma & Napa County
At Ongaro & Sons, we believe in prioritizing safety above all else. Part of that commitment means ensuring our customers across the North Bay understand the immense significance of installing smoke detectors and carbon monoxide (CO) alarms.
Here’s a more in-depth look at why these devices are indispensable.
House Fires in America
Fire departments in the United States have to respond to a staggering average of 343,000 house fires annually.
Fire Fatalities and Injuries
These fires sadly result in over 2,600 civilian deaths and cause injuries to over 11,000 people every year. One of the primary culprits behind these house fires? Faulty electrical equipment.
Protect Your Family and Your Home
The purpose of these alarms is simple yet crucial, to alert you to potential dangers, potentially saving your life. This is why they are intentionally loud and impossible to ignore.
It is also why our skilled electricians are meticulous in ensuring these devices not only function flawlessly but are also strategically placed for maximum effectiveness.
Common Culprits Behind CO Poisoning
The National Safety Council (NSC) reveals that carbon monoxide, often referred to as the “silent killer,” is a colorless and odorless gas that results in over 20,000 individuals seeking emergency medical care annually. Particularly at risk are infants, expectant mothers, and those with certain health conditions.
Unvented Space Heaters
These heaters burn fuel (like natural gas, kerosene, or propane) without venting combustion gases outside, which means CO can build up indoors if the heater isn’t getting enough fresh air.
Malfunctioning Furnaces & Defective Water Heaters
Malfunctioning furnaces, defective water heaters, and other gas appliances are not far behind. When appliances are faulty, poorly maintained, or improperly installed, they may fail to burn fuel completely. This incomplete combustion releases CO, which can then accumulate to harmful levels indoors.
Improperly Installed Whole-Home Generators
Improperly installed whole-home generators can pose a CO risk if exhaust isn’t properly routed away from the home.
Blocked Chimneys, Auto Exhaust & Wood-Burning Fireplaces
Blocked chimneys, auto exhaust, and wood-burning fireplaces also play a significant role. When chimneys are blocked by debris, nests, or structural damage, CO from burning fuel cannot escape and may backdraft into the home, posing a serious hazard.
Smoke Detector & CO Alarm Installation, Replacement & Upgrades
At Ongaro & Sons, we are an industry leader in offering advanced hardwired smoke and CO detector installation services. These include devices integrated with the latest smart technology. Whatever your preferences, requirements, or budget, our team can assist you in selecting the ideal model.
If your existing detector is not hardwired, it might be time to consider an upgrade. With a professional smoke detector or CO replacement, you can restore your peace of mind, knowing you are prepared for any emergency.

Smoke Detector & CO Alarm Repair and Maintenance
Our the North Bay team has certified, licensed, and insured electricians who are equipped and eager to restore your smoke detectors and CO alarms to their prime state.
We offer a broad spectrum of electrical services, including annual electrical inspections, during which our professionals evaluate the efficiency of your alarms and other equipment.
Want a worry-free way to maintain all your electrical systems? Join our Ongaro Maintenance Plans! We customize it to fit your personalized needs and budget.
For maximum protection, place alarms in these five key spots:
- Inside every bedroom, if a fire or CO leak occurs while you're asleep, an alarm here will alert you immediately.
- In the hallway or common area outside each bedroom, so the alarm wakes everyone in nearby rooms.
- On every level of the home, including finished basements and attics, since smoke and CO spread.
- At the top of stairways, since smoke rises and collects near the ceiling.
- Near the entry point from an attached garage, and possibly the room above it, to catch vehicle exhaust.

Schedule Your Smoke Detector & CO Alarm Service
We proudly serve Sonoma, Marin, and Napa counties, including Mill Valley, Bodega, Healdsburg, and all the other surrounding communities throughout the North Bay. Never compromise on the safety of your loved ones. Call us now at 415-741-2820 or book your appointment online.
Your Comfort, Our Priority
Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert, specializing in reliable maintenance and repair services that keep your home running efficiently year-round.
Our certified technicians deliver unmatched expertise with fast, friendly service across Marin, Sonoma and Napa County. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.
Licensed, Insured, Background-Checked
Our technicians are licensed, experienced, and trained to service all makes and models.
Locally Owned and Operated
Serving the Napa, Marin, and Sonoma communities with personalized, hometown service.
Reliable Repairs
We respond quickly and get the job done right the first time, with no surprises.
Since 1932
Why Ongaro & Sons for Smoke and Carbon Monoxide Alarms
California has specific requirements for placement, interconnection and replacement, and most houses do not meet all three.
Schedule Service →Placement checked against current requirements
Alarms are required in each sleeping room, outside each sleeping area and on every level. Houses that were compliant when built frequently are not now.
Interconnection so one alarm sounds them all
An alarm in the basement that nobody upstairs can hear is the failure mode that matters. Interconnection, wired or wireless, is what fixes it.
Age checked, because alarms expire
Smoke alarms have a service life of about ten years and carbon monoxide alarms less. The sensor degrades whether or not the test button still beeps.
Combination units used where they suit
Where a combined smoke and carbon monoxide alarm is appropriate we fit one. Where separate devices are better placed, we say so.
Done by a licensed electrical contractor
Hardwired and interconnected alarms are electrical work. Ongaro & Sons holds C-10 and has worked in the North Bay since 1932.

Discount
Membership
Ongaro Maintenance Plans
Annual maintenance on your home systems provides safeguards and comfort to you and your family. Members get priority scheduling, discounts, and proactive checkups that catch problems early.
Member Discounts
5% off every repair and replacement, all year long.
Peace of Mind
Proactive checkups catch issues before they become big problems.
Courtesy Reminders
We call you to schedule: never miss a seasonal service.
Value That Lasts
With Ongaro & Sons, you’re investing in quality, integrity, and service that stands the test of time. Explore our current promotions and see the difference real value makes for your HVAC, plumbing, and electrical needs.
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Read MoreFrequently Asked Questions
Do you install hardwired alarms with battery backup?
Yes, hardwired units offer reliable power, and battery backups ensure continued protection during outages.
Why does my alarm chirp even after replacing the battery?
Chirping could signal end-of-life, a wiring issue, or dust inside the unit. If the problem persists, the detector may need replacement.