Get a Quote Now
5.0 Google Reviews 11+ Years Experience NATE Certified Licensed & Insured 24/7 Live Dispatch

HVAC Maintenance.

A failing capacitor caught in spring is a small part and a quick swap. The same capacitor giving out in a 95-degree August week is an emergency call plus three days of misery. Onzone catches it in the routine tune-up.

Multi-point inspection, written report, manufacturer-warranty compliance. Schedule one seasonal visit, or sign on for the year and get priority scheduling plus 15 percent off any repairs.

Onzone branded technician on site

Problems we fix every day.

Dirty clogged filters

A loaded filter chokes airflow, strains the blower motor, and leaves rooms uneven while the system works harder for less. It is the simplest problem on this list and the one we find most.

Weak seasonal performance

If the system limped through last summer or winter, this is the visit that catches why: coil cleaning, refrigerant checks, calibration, and burner inspection.

Missed maintenance visits

Skip a year and the small things go unwatched: worn parts, loose electrical connections, slow drains. Skip a few and they graduate into breakdowns, usually in the worst week for it.

Uneven room temperatures

Rooms drifting hot and cold usually trace to airflow, dirty coils, duct restrictions, or thermostat settings that never got dialed in. A tune-up checks all four.

Why Onzone

24/7 Same-Day Service

A real person answers day or night, and most repairs get a tech on-site the same day. No-heat and no-cool emergencies jump the queue.

Upfront, Honest Pricing

The price we quote is the price you pay. Every job is approved in writing before work starts, so the invoice never surprises you.

Any Brand, Certified Techs

Carrier, Lennox, Trane, Mitsubishi, Daikin, and most mini-splits, new or decades old. NATE-certified, and every job is warrantied.

Licensed, Insured & Local

A licensed California C-20 contractor (CSLB #1154419), fully insured, and based in Pleasanton serving the Tri-Valley and Bay Area.

Book your maintenance visit.

REVIEWS

What Bay Area homeowners say.

5.0 rating on Google
Ivan Lopin June 2026

What a fantastic service! I wanted to have a UV bulb installed in my HVAC. Oleg and Tim came by and got it done efficiently, explaining the whole process and showing pictures of the installation after. These guys are pros! Super friendly and easy to talk to as well. Overall, highly satisfied with this experience and would absolutely recommend!

Read on Google
Annie James June 2026

I had two thermostats and 4 ceiling lamps installed. Staff did a wonderful job installing and making my AC work again. They were hardworking and did a great job. I am very happy with their good service and would definitely call them again when I need any AC/heating work done. They also did a great job installing ceiling lamps.

Read on Google
Roma Govorko June 2026

Oleg did an excellent job with our HVAC system. He was professional, knowledgeable, and very easy to work with. He arrived on time, carefully diagnosed the issue, and explained the repair options in a clear and honest way. The work was completed efficiently and with great attention to detail. Everything was left clean, and the system is now running perfectly. It's clear that Oleg takes pride in his work and genuinely cares about providing quality service. I highly recommend Oleg to anyone looking for a reliable and experienced HVAC specialist. I would not hesitate to hire him again for future heating and air conditioning needs.

Read on Google
FAQ

Common questions.

How often should I get HVAC maintenance?

Twice a year is the standard: spring for the AC, fall for the heat. For most homes, one combined visit in the shoulder season also works and still meets manufacturer warranty terms.

Do you offer maintenance contracts?

Yes. The annual plan covers two seasonal visits, priority scheduling, and 15 percent off any repairs that come up during the year. Most homeowners get more back from the discount than the plan costs.

What if you find something wrong during the tune-up?

You get a written line-item quote on the spot, and no work happens until you approve it. The tune-up price stays fixed; you only pay more if you authorize a repair.

Other locations

You may be interested

View all
Call Now