ONZONE HEATING & COOLING INC logo
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ONZONE HEATING & COOLING INC

5.0(
5
)
Thermostat Installation and Replacement, Thermostat Service, Central A/C Service or Repair,

About us

Onzone Heating and Cooling provides professional heating, ventilation, and air conditioning (HVAC) services for residential customers. We specialize in HVAC installation, replacement, repair, and maintenance, including heat pumps, furnaces, air conditioning systems, ductwork, and mini-split systems. Our team is committed to delivering reliable solutions, quality workmanship, honest recommendations, and excellent customer service. Whether you need a quick repair, routine maintenance, or a complete HVAC system replacement, we work hard to keep your home comfortable and energy efficient. At Onzone Heating and Cooling, customer satisfaction, professionalism, and dependable service are our top priorities. Founded by Oleg Nebrat, bringing 28 years of HVAC experience to residential and commercial clients.

Business highlights

Se habla espanol

Amenities

Free Estimates

Yes

Accepted Payment Methods

  • CreditCard
Reviews
5.05 Reviews
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Number of StarsImage of DistributionNumber of Ratings
5
100%
4
0%
3
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2
0%
1
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Showing 1-5 of 5 reviews
Sophia
Nov 2026
5.0
Google Review
Oleg was an absolute lifesaver today. Our AC stopped working in the middle of this heatwave and other places couldn't come for days. Oleg showed up right away, fixed it fast, and charged a very fair price. Such a relief to have cold air again!
Denys G.
Nov 2026
5.0
Google Review
I called Onzone Heating and Cooling at around 8 AM because our A/C stopped cooling. Their technician Oleg was in our house around 9 AM. After about 5 minutes he found the problem and after 10 more minutes our house started cooling again! Besides fixing the main problem, Oleg screwed in the outside A/C casing to reduce its noise, checked the freon state and provided advices about A/C filters. I was impressed by how quickly we were helped, level of details Oleg provided and value of the service. Great work Oleg and Onzone Heating and Cooling!
Daniel L.
Nov 2026
5.0
Google Review
Teym was amazing. I called early morning and managed to get a service appointment the same day. He arrived on time and identified in no time the issue I was having with my AC. Would highly recommend. Thanks!
Mary S.
Nov 2026
5.0
Google Review
Onzone Heating and Cooling was great! My repair request was accepted the same day, and Oleg arrived within a few hours. He quickly fixed the issue, and I really appreciated the fast, reliable service. Being without AC during a heat wave is stressful, especially when you’re trying to keep your pets comfortable and safe from overheating. I highly recommend Onzone!
Shivanshu M.
Nov 2026
5.0
Google Review
I had an excellent experience with Oleg Nebrat for our A/C repair. He demonstrated great professionalism, dedication, and technical expertise throughout the process. He carefully diagnosed the issue step by step, identified the problem with the A/C motor, and replaced it efficiently. What I appreciated most was his patience and methodical approach to troubleshooting rather than simply jumping to conclusions. He took the time to understand the root cause and ensure the issue was properly fixed. Highly recommend Oleg for anyone looking for a knowledgeable, reliable, and dedicated HVAC technician. Excellent work and outstanding service!

Licensing

Licensed*

Trade License Number

1154419

Trade License Locale

CA

Trade License Expiration

05/31/2028

State Contractor License Requirements

All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our Find Licensing Requirements page.

*Contact business to see additional licenses.

FAQ

ONZONE HEATING & COOLING INC is currently rated 5.0 overall out of 5.

Monday: 7:00 AM - 10:00 PM Tuesday: 7:00 AM - 10:00 PM Wednesday: 7:00 AM - 10:00 PM Thursday: 7:00 AM - 10:00 PM Friday: 7:00 AM - 10:00 PM Saturday: 7:00 AM - 10:00 PM Sunday: Closed

ONZONE HEATING & COOLING INC accepts the following forms of payment: CreditCard

Yes, ONZONE HEATING & COOLING INC offers free project estimates.

No, ONZONE HEATING & COOLING INC does not offer eco-friendly accreditations.

No, ONZONE HEATING & COOLING INC does not offer emergency services.

No, ONZONE HEATING & COOLING INC does not offer warranties.