- Services
- AC Installation & Replacement
- AC Repair & Maintenance
- Air Conditioner (AC) Tune Up
- Air Filter Maintenance
- Whole-Home Air Purification & Indoor Air Quality
- Furnace Installation & Replacement
- Furnace Repair
- HVAC Cleaning & Inspection
- HVAC Installation
- HVAC Repair & Maintenance
- HVAC Replacement
- Thermostat Repair
- Service Areas
- Maintenance Program
- Contact Us
- Book Now
Costa Mesa Service Area
Costa Mesa's Local HVAC Experts
AC repair, heating, and duct replacement across Eastside, Westside, Mesa Verde, and South Coast Metro, CSLB license #1038022, a 10-year installation warranty, and a 24/7 line answered by real people.
Book a Free Estimate Call (949) 590-3296Local & Reliable
Your Neighbors’ HVAC Company. Not a Call Center
Our Costa Mesa technicians are One Season employees, no subcontractors, no third-party call centers, ever. We have serviced thousands of Orange County homes, and Costa Mesa's mix of postwar bungalows and modern condos is territory we know street by street.
5,500+
HVAC Jobs Completed Across Orange County
5 Stars
From 300+ Verified Google & Yelp Reviews
Same-Day
Avg. Response to Costa Mesa Homes
Local Knowledge Matters
What We See in Costa Mesa Homes
Costa Mesa's housing runs from postwar Eastside and Westside bungalows through 1960s Mesa Verde ranch homes to modern South Coast Metro condos, and the HVAC problems track the era of the home almost perfectly. Census data puts nearly 7 in 10 Costa Mesa homes before 1980.
1940s-1950s postwar
Eastside Costa Mesa
Eastside's postwar bungalows were built before central air was standard, so retrofitted systems often fight undersized return ducts and closets never meant to hold a furnace. Fixing the airflow, not just the equipment, is usually the real solution here.
1950s-1960s
Westside Costa Mesa
Westside's older cottages and small ranch homes frequently still run original or second-generation ductwork under the floor or in shallow attics. Leaky, crushed, or undersized ducts are the most common reason a brand-new AC still cannot cool the back bedrooms.
1960s
Mesa Verde
Mesa Verde's ranch homes are classic 1960s single-story layouts with long duct runs and aging R-22-era equipment still hanging on in some houses. Systems here respond dramatically to duct sealing and right-sized modern replacements.
1980s-2000s
South Coast Metro
The condos and townhomes around South Coast Plaza often use compact package units or closet air handlers with tight clearances and HOA rules on placement. We handle the permit and HOA coordination that these swaps typically require.
Preventing Unexpected Breakdowns
Knowing when your block was built tells us what’s coming, so we fix it before you’re without AC in a 95° week.
What We Do
HVAC Services in Costa Mesa
From emergency repairs to high-efficiency system replacements, we deliver real solutions backed by real warranties.
AC Repair
Fast diagnosis and same-day fixes when your system stops cooling. We carry parts for all major brands.
SCHEDULE REPAIR
AC Installation
Right-sized, high-efficiency replacements backed by a 10-year warranty. We optimize air flow, not just equipment.
GET A FREE QUOTE
Furnace & Heating
Repairs and installs that keep up with cold nights. Ensure your heating is safe and efficient.
SCHEDULE HEATING SERVICE
Maintenance Plans
Twice-yearly tune-ups that head off mid-summer breakdowns. Season Pass Membership includes repair discounts.
VIEW MEMBERSHIP DETAILS
24/7 Emergency Service
A real technician dispatched any hour, any day of the year. When the heat hits, we answer.
CALL EMERGENCY LINENeed Quick HVAC Help?
Book your appointment online instantly or call us directly to get an expert scheduled.
Call (949) 590-3296Every Costa Mesa Neighborhood
We dispatch same-day across both Costa Mesa zip codes, 92626 and 92627, from the Eastside bluffs to South Coast Metro, usually with a truck already nearby on the 55 or the 405.
Eastside Costa Mesa
Westside Costa Mesa
Mesa Verde
Mesa del Mar
South Coast Metro
College Park
Halecrest
Freedom Homes
What We Stand For
Our Core Values
Honest Communication
No jargon, no hidden agenda, clear explanations and straight answers.
Zero Upselling
Our technicians are never paid to upsell. You get what your home needs.
Punctuality & Respect
On-time arrival, shoe covers on, and your property treated with care.
Upfront Pricing
You approve a clear, flat-rate cost before any work begins.
Guaranteed Workmanship
10-year parts, 2-year labor, and a 6-month follow-up on installs.
Community First
A local Orange County business, invested in the neighborhoods we serve.
Proven Results
Recent Jobs Around Costa Mesa
Eastside Costa Mesa • Full System & Ducts
Trent's complete system and duct replacement in one project, a repeat customer with 3 jobs done by our team.
Eastside Costa Mesa • Diagnostic & Repair
Shanna's system diagnosed and repaired, no replacement pitch, honest diagnosis, no pressure.
Mesa Verde • Diagnostic & Repair
Shea's an honest repair over an upsell, a Season Pass member with priority scheduling perks.
Serving Every Costa Mesa ZIP Code
We dispatch same-day across both Costa Mesa zip codes, 92626 and 92627, from the Eastside bluffs to South Coast Metro, usually with a truck already nearby on the 55 or the 405.
9262692627
Call (949) 590-3296
Quick Dispatch Guarantee
- GPS-tracked technicians routed across South OC
- Fully stocked vehicles, most repairs done first visit
- No dispatch fees with completed repairs
Our technicians are strategically routed across South Orange County, meaning we usually have someone minutes from your door.
Customer Reviews
Hundreds of homeowners across Costa Mesa and Orange County trust One Season for honest, reliable HVAC service.
Our shop is at 7700 Irvine Center Dr in Irvine, only about a 20-minute drive to the heart of Costa Mesa. We can usually get out same-day, next-day at the latest. Summertime we can get booked out quick, so call (949) 590-3296 and get our live schedule availability.
-
Joe and the One Season team were great! Joe called to let me know when he was on his way, he was punctual, friendly, and knowledgeable. Appreciate the transparency and friendly service.
Charlie Yerkes
December 6, 2025Daniel did a good job . Thanks
Olive Rhone
December 12, 2025These guys killed it they showed up around 9 AM and by 3:30 they were wrapped up heading for home an amazing job if you need a new AC heating there your choice and the price was great.! Also, please take a look at the detail of how they strapped the unit to the base and then the base to the concrete amazing attention to detail!
Todd Hayes
December 3, 2025 -
Daniel awesome He took time to explain the process and his findings My unit is older and the filter is not a common size. He took time to go purchase one. Best of all he did not try to sell me a new unit. He was courteous and answered all my question I will continue to use this company and request Daniel
Lourdes Maria de Varona
February 25, 2026Great company that was referred to me in 2024 by a good friend. Used them to install new ductwork, routine system inspection and may continue to use them in the future as needed!
Koley Anthony
January 13, 2026Amazing vendor. Very honest, and have amazing tech. We were in difficult situation where our lennox has proprietary system and our thermstat went out. But he made simple and just easy to be out of that lennox dependency. Will use them again in the future with their annual maintenance
Johny Hartanto
April 21, 2026 -
Was a great experience, very pleasant! Technicians are very professional, did a wonderful job
John Teng
January 12, 2026Excellent service!
Phillip Bissada
December 6, 2025⭐️⭐️⭐️⭐️⭐️ Update: We completed a regular maintenance service and a couple of weeks later our thermostat disconnected from our WiFi. When I attempted to reconnect, I selected an incorrect setting. OneSeason came out a day earlier then I scheduled to fix this new problem and they got it fixed and let me know my mistake. Once again, great service from an exceptional company! Top-Notch HVAC Installation – Professional, Efficient, and Honest! I couldn’t be happier with my experience working with One Season HVAC for a full system installation. From the initial consultation to the final walkthrough, every step was handled with professionalism and care. The team arrived on time, walked me through all of my options, and helped me choose the best system for my home without any pressure or upselling. Their knowledge and honesty were refreshing. The installation itself was seamless—clean, efficient, and completed ahead of schedule. What impressed me most was the attention to detail. They treated my home with respect, ensured everything was working perfectly, and even followed up afterward to make sure I was satisfied. The new system is running flawlessly, and I’ve already noticed a big difference in comfort and efficiency. If you’re looking for reliable experts who take pride in their work, I highly recommend One Season HVAC. They’ve earned my trust and future business!
K&V California
March 31, 2026
CA License #1038022
5 Stars · 300+ Google & Yelp Reviews
10-Year Parts Warranty
100% Satisfaction Guarantee
Good Questions, Straight Answers
How quickly can you get to my Costa Mesa home?
We run same-day dispatch across Costa Mesa and all of Orange County, and our 24/7 emergency line is answered by real people. Call (949) 590-3296 and in most cases a technician is at your door the same day.
Are you licensed to work in Costa Mesa?
Yes. One Season holds CSLB license #1038022 and pulls permits through the City of Costa Mesa building division for replacements, ductwork, and any work that requires inspection.
My postwar Eastside home never cools evenly. Is that my AC's fault?
Usually not. Homes built in the 1940s and 50s were never designed for central air, so retrofits often run on undersized returns and leaky ducts. We diagnose the whole airflow path first, replacing equipment without fixing the ducts just moves the problem.
Do you offer a maintenance plan in Costa Mesa?
Yes, the Season Pass includes twice-yearly tune-ups plus repair discounts. For Costa Mesa's older housing stock, the pre-summer visit regularly catches failing capacitors and refrigerant issues before they turn into no-cool calls.
Is old ductwork really worth replacing in Costa Mesa homes?
Often, yes. Much of Costa Mesa's ductwork dates to the original construction and can lose a large share of conditioned air through leaks and crushed runs. We test duct leakage first, then tell you honestly whether sealing or replacement makes sense, sometimes the ducts, not the unit, are the whole problem.
Get in Touch
Get Same-Day HVAC Service in Costa Mesa
Call now and talk to a real person, or book online and we’ll confirm your arrival window within minutes.
(949) 590-3296 · 24/7 Emergency Line
7700 Irvine Center Dr #800, Irvine, CA 92618
Book Your Free Estimate
No obligation, flat-rate pricing. We’ll contact you within 15 minutes.
What to Expect from Us
Clear Communication & Honest Advice
Straight answers about what your system needs, and what it doesn't.
Punctual, Respectful Technicians
We show up on time and treat your home like our own.
Upfront Pricing, No Surprises
Flat-rate quotes approved by you before work begins.
Guaranteed Workmanship & Satisfaction
Backed by a 10-year parts and 2-year labor warranty.
