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Our flagship division
Cairn Smart
Home automation, theater, networking, lighting, shades, and security — designed and installed to feel effortless.
The line's answered 24/7 — day or night.24-hour estimates · weekends included
Rated 4.9★ by verified customers·Licensed & insured New Hampshire company
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NH Registered
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Fully Insured
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Licensed Trades
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24/7 Emergency
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NH registered
OSNH Home Services LLC, an established New Hampshire company.
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Fully insured
General-liability coverage on every job, in every home.
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Licensed trades
Electrical and plumbing performed by NH state-licensed professionals.
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One company
Smart home, build, and care — one accountable point of contact.
Cairn Smart services
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Smart Home Automation
One tap controls your whole home.
02Home Theater & AV
Cinema sound and picture, cleanly installed.
03Wi-Fi & Home Networking
Fast, reliable coverage in every room.
04Smart Lighting
The right light, automatically.
05Motorized Shades
Light and privacy, on schedule.
06Security Cameras & Access
See and control your home from anywhere.
07Smart Locks & Keyless Entry
Keyless, controlled, and logged.
08Video Doorbells
See every visitor, from anywhere.
09Commercial Smart Building Systems
Smarter, more efficient commercial space.
10Commercial Security & Access
Protect your business, on your terms.
11Commercial Network Cabling
The backbone your business runs on.
12Control4 Smart Home Systems
One elegant system for the whole home.
13Lutron Lighting & Shades
The gold standard in light control.
14Sonos Whole-Home Audio
Great sound in every room.
15TV Mounting
Mounted level, with the wires hidden.
16Home Theater & Surround Sound
Cinema at home, properly done.
17Move-In Setup
Walk into a home that's ready and secure.
Start here
Get a free Cairn Smart quote
Tell us about your project. We respond fast — usually the same day — with a clear, honest plan.
- — Same-day response on most requests
- — Licensed, insured, and accountable
- — Clear pricing before any work begins